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OSHA Elec test topic: temporary Wiring

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1. An electrician is setting up temporary power on a construction site and needs to run an extension cord across a floor. According to OSHA construction electrical safety rules, how must the cord be secured?None of the above; it must not be fastened with staples, hung from nails, or suspended by wire. The regulation prohibits using staples, nails, or wire to secure extension cords, making the negative option the only correct choice.
   29 CFR § 1926.416(e): “Extension cords shall not be fastened with staples, hung from nails, or suspended by wire.”
2. An industrial worker is terminating a metal-sheathed cable where conductors emerge from the sheath and protection against moisture or physical damage is necessary. What device is required to protect the insulation of the conductors?A cable sheath terminating device. The rule mandates the use of a specific cable sheath terminating device to protect conductor insulation in these conditions.
   29 CFR § 1910.308(a): “Where cable conductors emerge from a metal sheath and where protection against moisture or physical damage is necessary, the insulation of the conductors shall be protected by a cable sheath terminating device.”
3. A worker is installing metal raceways in an outdoor construction environment. What material requirement must the raceways meet?They must be made of materials appropriate for the environment in which they are to be installed. The regulation requires that metal components be made of materials suitable for the specific environment to prevent corrosion and deterioration.
   29 CFR § 1926.432(b): “Metal raceways, cable armor, boxes, cable sheathing, cabinets, elbows, couplings, fittings, supports, and support hardware shall be of materials appropriate for the environment in which they are to be installed.”
4. A worker is running a flexible cord through a hole in a metal outlet box cover. What protection is required for the cord at this point?Bushings or fittings. To prevent damage to the cord's insulation, bushings or fittings are required when passing through holes in enclosures like outlet box covers.
   29 CFR § 1926.405(g): “Flexible cords and cables shall be protected by bushings or fittings where passing through holes in covers, outlet boxes, or similar enclosures.”
5. When an electrician installs an emergency power system for illumination, what is the required relationship between the emergency circuit wiring and other wiring?It must be kept entirely independent of all other wiring and equipment. OSHA requires emergency circuit wiring to be independent from other wiring to ensure it remains operational during a failure of the normal supply.
   29 CFR § 1910.308(b): “Emergency circuit wiring shall be kept entirely independent of all other wiring and equipment and may not enter the same raceway, cable, box, or cabinet or other wiring except either where common circuit elements suitable for the purpose are required, or for transferring power from the normal to the emergency source.”
6. When an electrician installs a new piece of equipment, they must ensure it is 'certified.' Which of the following criteria must the equipment meet to be considered certified under this subpart?It must have been tested by a qualified testing laboratory to meet applicable standards and be subject to periodic production inspections by that laboratory. Certification requires both initial testing by a qualified laboratory to meet standards and periodic inspection of the production process by that same qualified laboratory.
   29 CFR § 1926.449: “Equipment is “certified” if it: (a) Has been tested and found by a qualified testing laboratory to meet applicable test standards or to be safe for use in a specified manner, and (b) Is of a kind whose production is periodically inspected by a qualified testing laboratory.”
7. An electrician is installing new branch circuit conductors in a junction box that already contains photovoltaic (PV) source circuit conductors. According to OSHA rules for solar photovoltaic systems, what condition must be met to allow these different systems to share the same enclosure?The conductors must be separated by a partition or connected together. The regulation permits mixing PV source/output circuits with other system feeders/branch circuits only if they are separated by a partition or connected together.
   29 CFR § 1910.308(f): “Photovoltaic source circuits and photovoltaic output circuits may not be contained in the same raceway, cable tray, cable, outlet box, junction box, or similar fitting as feeders or branch circuits of other systems, unless the conductors of the different systems are separated by a partition or are connected together.”
8. An electrician is installing a new branch circuit in a commercial building and must select an enclosed channel to hold the wires. According to the definition of 'Raceway,' which of the following is included in this category?Rigid metal conduit. The rule lists rigid metal conduit as an example of a raceway, while the other options are not listed as raceways in the rule.
   29 CFR § 1910.399: “Raceways include, but are not limited to, rigid metal conduit, rigid nonmetallic conduit, intermediate metal conduit, liquidtight flexible conduit, flexible metallic tubing, flexible metal conduit, electrical metallic tubing, electrical nonmetallic tubing, underfloor raceways, cellular concrete floor raceways, cellular metal floor raceways, surface raceways, wireways, and busways.”
9. In an industrial establishment where only qualified persons service the installed cable tray system, which single conductor cable type is permitted in a ladder cable tray?No. 1/0 or larger single conductor cable listed and marked for use in cable trays. For industrial establishments with qualified supervision, single conductors in ladder trays must be No. 1/0 or larger and specifically listed/marked for cable tray use.
   29 CFR § 1910.305(a): “Single conductor cable; the cable shall be No. 1/0 or larger and shall be of a type listed and marked on the surface for use in cable trays”
10. An electrician is selecting a cable for a factory assembly consisting of one or more insulated circuit conductors enclosed in an armor of interlocking metal tape. Which cable type corresponds to this description?Metal-clad cable (Type MC). The definition of Metal-clad cable (Type MC) specifically mentions conductors enclosed in an armor of interlocking metal tape.
    29 CFR § 1910.399: “Metal-clad cable (Type MC). A factory assembly of one or more insulated circuit conductors with or without optical fiber members enclosed in an armor of interlocking metal tape, or a smooth or corrugated metallic sheath.”
11. When setting up wiring for an amusement ride at a fair, an electrician must ensure that flexible cords and cables used outdoors meet which specific listing requirements?Listed for extra-hard usage, wet locations, and sunlight resistance. Outdoor flexible cords for carnivals must be listed for extra-hard usage, wet locations, and be sunlight resistant.
    29 CFR § 1910.306(k): “Flexible cords and cables shall be listed for extra-hard usage. When used outdoors, flexible cords and cables shall also be listed for wet locations and shall be sunlight resistant.”
12. Before using a flexible extension cord set for portable equipment, what inspection is required by the worker?Visual inspection for external defects and evidence of possible internal damage. Workers must visually inspect cords before use on any shift to identify both external defects and signs of internal damage like pinching or crushing.
    29 CFR § 1910.334(a): “Portable cord- and plug-connected equipment and flexible cord sets (extension cords) shall be visually inspected before use on any shift for external defects (such as loose parts, deformed and missing pins, or damage to outer jacket or insulation) and for evidence of possible internal damage (such as pinched or crushed outer jacket).”
13. An electrician is routing Class 2 circuit conductors in the same raceway as power-limited fire alarm (PLFA) circuit conductors. What condition must be met regarding the insulation of the Class 2 conductors?The insulation of Class 2 circuit conductors must be at least that needed for the power-limited fire alarm circuits. Mixing Class 2 and PLFA conductors is permitted only if the Class 2 insulation rating matches or exceeds the requirement for the PLFA circuits.
    29 CFR § 1910.308(d): “provided that the insulation of Class 2 circuit conductors in the cable, enclosure, or raceway is at least that needed for the power-limited fire alarm circuits”
14. An electrician needs to repair a hard service flexible cord (No. 12 or larger) that has been damaged. Under what condition does OSHA allow this repair?If the splice retains the insulation, outer sheath properties, and usage characteristics of the original cord. Repairs are only allowed for hard service cords No. 12 or larger if the splice maintains the original cord's protective and usage characteristics.
    29 CFR § 1926.405(g): “Hard service flexible cords No. 12 or larger may be repaired if spliced so that the splice retains the insulation, outer sheath properties, and usage characteristics of the cord being spliced.”
15. An electrician is installing temporary lighting inside a concession tent. To comply with OSHA requirements for lamps used for general illumination, what specific protection must be provided?A suitable fixture or lampholder with a guard to protect from accidental breakage. The regulation requires that temporary lamps for general illumination inside tents and concessions be protected from accidental breakage by a suitable fixture or lampholder with a guard.
    29 CFR § 1910.306(k): “All temporary lamps for general illumination shall be protected from accidental breakage by a suitable fixture or lampholder with a guard.”
16. An industrial worker is installing overhead open conductors rated at 480 volts across a flat roof. What is the minimum vertical clearance required above the roof surface?2.44 m (8.0 ft). The rule states that overhead spans must have a vertical clearance of at least 8.0 feet above the roof surface.
    29 CFR § 1910.304(c): “Overhead spans of open conductors and open multiconductor cables shall have a vertical clearance of not less than 2.44 m (8.0 ft) above the roof surface.”
17. An unqualified worker is performing non-electrical maintenance work near a premises wiring installation. According to the scope of electrical safety-related work practices, are the provisions of §§ 1910.331 through 1910.335 applicable to this worker?Yes, because the provisions cover work performed by unqualified persons on, near, or with the listed installations. The rule states that the safety-related work practices apply to unqualified persons working on, near, or with the covered installations.
    29 CFR § 1910.331(b): “The provisions of §§ 1910.331 through 1910.335 also cover: (1) Work performed by unqualified persons on, near, or with the installations listed in paragraphs (c)(1) through (4) of this section”
18. A worker is installing a system to support cables and raceways using a rigid structural system. According to the definition of a 'Cable tray system', which of the following is included as part of this system?Associated fittings. The definition specifies that the system includes 'associated fittings' as part of the rigid structural system.
    29 CFR § 1910.399: “A unit or assembly of units or sections and associated fittings forming a rigid structural system used to securely fasten or support cables and raceways.”
19. Which of the following statements correctly describes the requirement for metal raceways and enclosures in general use wiring?They shall be metallically joined together into a continuous electric conductor. Metal raceways and enclosures must be metallically joined to provide effective electrical continuity, ensuring they act as a continuous conductor.
    29 CFR § 1926.405(a): “Metal raceways, cable armor, and other metal enclosures for conductors shall be metallically joined together into a continuous electric conductor and shall be so connected to all boxes, fittings, and cabinets as to provide effective electrical continuity.”
20. An electrician is installing communications wires and cables on a pole that also supports electric light and power conductors. To comply with OSHA requirements for in-span parallel runs, what is the required positioning of the communications wires relative to the power conductors?Communications wires must be located below the electric light or power conductors where practicable. The regulation requires communications wires to be placed below power conductors on shared poles when it is practicable to do so.
    29 CFR § 1910.308(e): “Where practicable, communication wires and cables on poles shall be located below the electric light or power conductors”
21. A worker is routing communication lead-in conductors on a utility pole where light and power conductors are also present. To comply with safety rules regarding pole placement, what is the required positioning of the communication conductors relative to the power conductors?Communication conductors shall be located below the light or power conductors and not attached to a crossarm carrying them. The rule mandates that communication conductors be placed below power conductors and prohibits sharing a crossarm with them.
    29 CFR § 1926.408(c): “Where practicable, communication conductors on poles shall be located below the light or power conductors. Communications conductors shall not be attached to a crossarm that carries light or power conductors.”
22. An industrial worker is about to plug a flexible cord into a receptacle. What specific check must be performed first to ensure safety?Check that the plug and receptacle contacts are of proper mating configurations. The regulation requires checking the mating configuration of the plug and receptacle contacts before connection.
    29 CFR § 1910.334(a): “When an attachment plug is to be connected to a receptacle (including any on a cord set), the relationship of the plug and receptacle contacts shall first be checked to ensure that they are of proper mating configurations.”
23. An electrician is installing temporary wiring for experimental development work where the feeders are accessible only to qualified persons. Under which specific condition may these feeders be run as single insulated conductors rather than multiconductor assemblies?When the installation is for experimental or development work and is accessible only to qualified persons. The rule allows single insulated conductors for feeders only if the installation is for experimental/development work (or emergencies) and is accessible only to qualified persons.
    29 CFR § 1910.305(a): “However, if installed as permitted in paragraph (a)(2)(i)(C) of this section, and if accessible only to qualified persons, feeders may be run as single insulated conductors.”
24. When installing communications wires and cables on a pole shared with electric light or power conductors, which attachment method is prohibited by OSHA standards?Attaching them to a crossarm that carries electric light or power conductors. The rule forbids attaching communications wires to the same crossarm that supports power conductors.
    29 CFR § 1910.308(e): “Communications wires and cables may not be attached to a crossarm that carries electric light or power conductors.”
25. A worker is setting up temporary lighting in a dry indoor area and needs to protect lamps from accidental contact or breakage. What is the required method for general illumination lamps?Protected by a suitable fixture or lampholder with a guard. The rule mandates that all general illumination lamps be protected by a suitable fixture or lampholder with a guard, regardless of voltage or height, making the other options insufficient or non-compliant.
    29 CFR § 1910.305(a): “All lamps for general illumination shall be protected from accidental contact or breakage by a suitable fixture or lampholder with a guard.”
26. An electrician is routing flexible cords and cables through a doorway in an industrial facility. What must be done to comply with safety standards regarding physical damage?Protect the cords from accidental damage caused by pinch points such as doorways. The rule specifically cites doorways and pinch points as hazards that require flexible cords to be protected from accidental damage.
    29 CFR § 1910.305(a): “Flexible cords and cables shall be protected from accidental damage, as might be caused, for example, by sharp corners, projections, and doorways or other pinch points.”
27. An electrician is repairing a damaged section of a hard-service flexible cord (No. 14 AWG) used for temporary power. According to OSHA regulations, what is the required condition for this repair?The splice must retain the insulation, outer sheath properties, and usage characteristics of the original cord. The regulation allows splicing for No. 14 and larger hard-service cords only if the repair maintains the original cord's insulation, sheath, and usage properties.
    29 CFR § 1910.305(g): “Hard-service cord and junior hard-service cord No. 14 and larger may be repaired if spliced so that the splice retains the insulation, outer sheath properties, and usage characteristics of the cord being spliced.”
28. An electrician is installing a factory assembly of two or more insulated conductors under a nonmetallic jacket for use in a cable tray. According to the definitions in 29 CFR § 1910.399, what is the specific name for this type of cable?Power-limited tray cable (Type PLTC). The rule defines Type PLTC as a factory assembly of insulated conductors under a nonmetallic jacket, distinguishing it from Type TC which includes grounding conductors and is approved for raceways or messenger wires.
    29 CFR § 1910.399: “Power-limited tray cable (Type PLTC). A factory assembly of two or more insulated conductors under a nonmetallic jacket.”
29. An electrician is running open conductors for a temporary branch circuit. What is the maximum allowable interval for fastening these conductors?10 feet (3.05 m). The rule specifies that open conductors for temporary branch circuits must be fastened at intervals not exceeding 10 feet.
    29 CFR § 1926.405(a): “the conductors shall be fastened at intervals not exceeding 10 feet (3.05 m).”
30. When installing a surface-mounted enclosure where a nonmetallic sheath cable enters through a nonflexible raceway, what is the minimum distance the cable sheath must extend into the enclosure beyond the fitting?6.35 mm (0.25 in.). One of the conditions for this specific installation method is that the cable sheath must extend at least 6.35 mm (0.25 inches) into the enclosure.
    29 CFR § 1910.305(b): “The cable sheath is continuous through the raceway and extends into the enclosure not less than 6.35 mm (0.25 in.) beyond the fitting;”
31. A worker is installing temporary branch circuit conductors as open conductors. At what interval must these conductors be fastened to ensure compliance?Every 3.05 m (10.0 ft) at ceiling height. The regulation requires open conductors in temporary branch circuits to be fastened at ceiling height every 10 feet.
    29 CFR § 1910.305(a): “If run as open conductors, they shall be fastened at ceiling height every 3.05 m (10.0 ft).”
32. An electrician is running single conductor cable for a carnival attraction. What is the minimum wire size required by OSHA for this application?No. 2. For carnivals and similar events, OSHA mandates that single conductor cable must be size No. 2 or larger.
    29 CFR § 1910.306(k): “Single conductor cable shall be size No. 2 or larger.”
33. An electrician is selecting a flexible cord assembly for a temporary power connection. The assembly consists of insulated conductors within a flexible metallic enclosure. What is the specific OSHA-defined name for this type of cable?Armored cable (Type AC). The definition describes Armored cable (Type AC) as insulated conductors in a flexible metallic enclosure.
    29 CFR § 1910.399: “Armored cable (Type AC). A fabricated assembly of insulated conductors in a flexible metallic enclosure.”
34. An electrician is connecting a power cable to a mobile machine. How must the terminals of the power cable be enclosed?In a metallic enclosure on the mobile machine. The rule requires a metallic enclosure specifically on the mobile machine to house the cable terminals.
    29 CFR § 1926.408(a): “A metallic enclosure shall be provided on the mobile machine for enclosing the terminals of the power cable.”
35. A worker is using a flexible electric cord to connect portable equipment. How must the worker handle the cord when raising or lowering the equipment?The cord may not be used for raising or lowering the equipment. The regulation forbids using the flexible cord itself to lift or lower the connected equipment to prevent damage to the cord.
    29 CFR § 1910.334(a): “Flexible electric cords connected to equipment may not be used for raising or lowering the equipment.”
36. When using single-pole portable cable connectors for AC applications, what type of connector is required and what labeling is needed if paralleled sets are used as input devices?They must be listed and of the locking type; paralleled sets must be prominently labeled with a warning indicating the presence of internal parallel connections. AC single-pole connectors must be locking type, and any paralleled input sets require a specific warning label about internal parallel connections to ensure worker safety.
    29 CFR § 1910.306(k): “Where ac single-pole portable cable connectors are used, they shall be listed and of the locking type. Where paralleled sets of current-carrying single-pole separable connectors are provided as input devices, they shall be prominently labeled with a warning indicating the presence of internal parallel connections.”
37. A facility manager is reviewing electrical installations to determine which ones must comply with the design safety standards in §§ 1910.302 through 1910.308. Which installation date threshold triggers the requirement for every electrical installation and all utilization equipment to comply with these provisions?Installed or overhauled after March 15, 1972. The rule states that installations made after March 15, 1972, must comply with the design safety standards, whereas the other dates apply to specific subsets of requirements or different regulations.
    29 CFR § 1910.302(b): “(2) Requirements applicable to installations made after March 15, 1972. Every electrical installation and all utilization equipment installed or overhauled after March 15, 1972, shall comply with the provisions of §§ 1910.302 through 1910.308, except as noted in paragraphs (b)(3) and (b)(4) of this section.”
38. An electrician is routing a flexible extension cord across a construction floor where it must pass through a doorway. What is required to comply with safety standards for this pinch point?Protection must be provided to avoid damage to the cord. The rule allows flexible cords to pass through doorways or pinch points only if specific protection is provided to prevent damage.
    29 CFR § 1926.405(a): “Flexible cords and cables may pass through doorways or other pinch points, if protection is provided to avoid damage.”
39. An electrician is setting up temporary lighting on a construction site. Under which condition is it permissible to suspend the lights by their electric cords?If the cords and lights are specifically designed for this means of suspension. The regulation prohibits suspending temporary lights by their cords unless the specific cord and light assembly is designed for that purpose.
    29 CFR § 1926.405(a): “Temporary lights shall not be suspended by their electric cords unless cords and lights are designed for this means of suspension.”
40. A worker is installing a portable cable over 600 volts to supply power to mobile equipment. What is the minimum conductor size required for the main conductors?No. 8 or larger conductors employing flexible stranding. For portable cables over 600 volts, the regulation mandates that main conductors must be No. 8 or larger with flexible stranding.
    29 CFR § 1910.305(h): “Multiconductor portable cable for use in supplying power to portable or mobile equipment at over 600 volts, nominal, shall consist of No. 8 or larger conductors employing flexible stranding.”
41. When installing conductors in a tunnel, which of the following is a required method of installation?Metal conduit or other metal raceway. The rule lists metal conduit or other metal raceway as an approved method for installing conductors in tunnels.
    29 CFR § 1926.408(a): “Conductors in tunnels shall be installed in one or more of the following: (A) Metal conduit or other metal raceway, (C) Other suitable multiconductor cable.”
42. A worker is installing equipment with NPT threaded entries for field wiring connection in a hazardous location. What type of conduit or cable fittings must be used?Listed conduit, conduit fittings, or cable fittings. The regulation mandates the use of listed components specifically for NPT threaded entries to ensure proper installation and safety.
    29 CFR § 1910.307(g): “For equipment provided with threaded entries for NPT threaded conduit or fittings, listed conduit, conduit fittings, or cable fittings shall be used.”
43. A worker needs to connect two lengths of portable cable over 600 volts in a run. What is the required characteristic of the connectors used for this connection?They shall be of a type that lock firmly together. OSHA mandates that connectors joining portable cable lengths must lock firmly to ensure a secure connection and prevent accidental disconnection.
    29 CFR § 1910.305(h): “Connectors used to connect lengths of cable in a run shall be of a type that lock firmly together.”
44. When connecting a flexible cord to a device or fitting, what specific safety measure must be provided to protect the internal connections?Strain relief that prevents pull from being directly transmitted to joints or terminal screws. OSHA requires strain relief at connections to ensure that pulling on the cord does not stress the internal joints or terminal screws.
    29 CFR § 1910.305(g): “Flexible cords and cables shall be connected to devices and fittings so that strain relief is provided that will prevent pull from being directly transmitted to joints or terminal screws.”
45. An electrician is setting up temporary lighting for a carnival that will last for 60 days. Under what condition is this temporary installation permitted?It is permitted because the duration does not exceed 90 days for such purposes. Temporary installations for carnivals are allowed for a period not exceeding 90 days, whereas other options contradict the rules regarding voltage, ducts, and bare conductors.
    29 CFR § 1910.305(a): “For a period not to exceed 90 days for Christmas decorative lighting, carnivals, and similar purposes; or”
46. When running indoor communications wires and cables near existing electric light or power conductors, what is the minimum separation distance an electrician must maintain unless a special protective method is used?At least 50.8 mm (2 in.). OSHA mandates a minimum 2-inch separation for indoor communications cables from power conductors to prevent accidental contact.
    29 CFR § 1910.308(e): “Indoor communications wires and cables shall be separated at least 50.8 mm (2 in.) from conductors of any electric light, power, Class 1, nonpower-limited fire alarm, or medium power network-powered broadband communications circuits”
47. An electrician is preparing to use a Type SJ flexible cord for general wiring. What marking requirement must be met before the cord can be used?It must be durably marked on the surface with the type designation, size, and number of conductors. The rule lists the required markings (type, size, number of conductors) for these specific cord types.
    29 CFR § 1926.405(g): “Type SJ, SJO, SJT, SJTO, S, SO, ST, and STO cords shall not be used unless durably marked on the surface with the type designation, size, and number of conductors.”
48. An industrial worker is routing communications wires and cables on a building near existing lightning conductors. What is the minimum separation distance required between these wires and the lightning conductors?1.83 m (6 ft). OSHA requires a specific 6-foot separation between building-mounted communications wires and lightning conductors.
    29 CFR § 1910.308(e): “A separation of at least 1.83 m (6 ft) shall be maintained between communications wires and cables on buildings and lightning conductors.”
49. An electrician is installing general illumination lamps for a temporary construction site setup. What protection is required for these lamps?They must be protected from accidental contact or breakage. The rule mandates that all general illumination lamps be protected against accidental contact or breakage.
    29 CFR § 1926.405(a): “All lamps for general illumination shall be protected from accidental contact or breakage.”
50. When installing temporary wiring, what is the requirement for receptacles used for purposes other than temporary lighting?They shall not be installed on branch circuits which supply temporary lighting. The regulation prohibits mixing receptacles for other uses with those supplying temporary lighting on the same branch circuit.
    29 CFR § 1926.405(a): “Receptacles for uses other than temporary lighting shall not be installed on branch circuits which supply temporary lighting.”
51. When installing temporary wiring, which of the following practices is strictly prohibited for any type of temporary circuit?Using bare conductors or earth returns. The rule bans the use of bare conductors and earth returns in temporary wiring, while the other options describe permitted or required practices.
    29 CFR § 1910.305(a): “No bare conductors nor earth returns may be used for the wiring of any temporary circuit.”
52. An electrician is supporting flexible cords and cables in an industrial facility. Which of the following is an acceptable method of support that ensures protection from physical damage?Staples, cable ties, straps, or similar type fittings installed so as not to cause damage. The regulation specifically lists staples, cable ties, and straps as acceptable supports provided they do not cause damage, whereas the other options risk physical damage or are not listed as approved support methods.
    29 CFR § 1910.305(a): “Support shall be in the form of staples, cables ties, straps, or similar type fittings installed so as not to cause damage.”
53. For systems over 600 volts nominal, where are open runs of non-metallic-sheathed cable or bare conductors permitted to be installed?In locations which are accessible only to qualified persons. The rule allows these specific open runs only in areas restricted to qualified persons.
    29 CFR § 1926.408(a): “However, open runs of non-metallic-sheathed cable or of bare conductors or busbars may be installed in locations which are accessible only to qualified persons.”
54. When an electrician installs a wireway to house and protect electric wires and cable, what is the required sequence for installing the conductors?The conductors are laid in place after the wireway has been installed as a complete system. The definition specifies that conductors are installed after the wireway itself is fully installed as a complete system.
    29 CFR § 1910.399: “Wireways. Sheet-metal troughs with hinged or removable covers for housing and protecting electric wires and cable and in which conductors are laid in place after the wireway has been installed as a complete system.”
55. An electrician is installing threaded conduit in a Class I, Zone 1 hazardous location. To ensure the explosionproof integrity of the system and prevent sparking during a fault, what specific threading standard and tightness must be used?Threaded with an NPT standard conduit cutting die providing 3/4-in. taper per foot and made wrench tight. The regulation mandates the use of NPT dies with a 3/4-inch taper per foot and requires the conduit to be wrench tight to maintain explosionproof integrity.
    29 CFR § 1910.307(g): “All threaded conduit shall be threaded with an NPT (National (American) Standard Pipe Taper) standard conduit cutting die that provides 3⁄4-in. taper per foot. The conduit shall be made wrench tight to prevent sparking when fault current flows through the conduit system and to ensure the explosionproof or flameproof integrity of the conduit system where applicable.”
56. An electrician is installing an aerial communications circuit that runs partly outside a block. According to OSHA standards, what specific device must be provided on this circuit?A listed primary protector. The regulation mandates a listed primary protector for aerial circuits not confined within a block.
    29 CFR § 1910.308(e): “A listed primary protector shall be provided on each circuit run partly or entirely in aerial wire or aerial cable not confined within a block.”
57. A construction crew is setting up temporary electrical installations for power and light on a new jobsite. According to the scope of installation safety requirements, which of the following installations is covered by these rules?Portable and vehicle-mounted generators used to provide power for equipment used at the jobsite. While general generation and transmission installations are excluded, the rule specifically notes that portable and vehicle-mounted generators used for jobsite equipment are covered.
    29 CFR § 1926.402(b): “However, these regulations do cover portable and vehicle-mounted generators used to provide power for equipment used at the jobsite.”
58. An electrician is installing temporary wiring for a construction site. According to the definition of 'Premises wiring system,' which of the following components is EXCLUDED from this system?Wiring internal to a motor control center. The rule states that premises wiring excludes wiring internal to equipment like motor control centers, while including the other listed wiring types.
    29 CFR § 1926.449: “Such wiring does not include wiring internal to appliances, fixtures, motors, controllers, motor control centers, and similar equipment.”
59. An industrial worker is inspecting a wiring system where single insulated conductors are supported by cleats and knobs on a wall surface, not concealed by the building structure. According to the definitions in 29 CFR § 1910.399, how is this specific wiring method classified?Open wiring on insulators. The rule defines this exposed method using cleats and knobs as 'Open wiring on insulators,' distinguishing it from concealed premises wiring or cable types.
    29 CFR § 1910.399: “Open wiring on insulators is an exposed wiring method using cleats, knobs, tubes, and flexible tubing for the protection and support of single insulated conductors run in or on buildings, and not concealed by the building structure.”
60. A worker is connecting a flexible cord to a device and fitting. What feature must the connection provide to ensure safety?Strain relief which will prevent pull from being directly transmitted to joints or terminal screws. The rule specifically requires strain relief at connections to devices and fittings to protect joints and terminal screws from pull.
    29 CFR § 1926.405(g): “Flexible cords shall be connected to devices and fittings so that strain relief is provided which will prevent pull from being directly transmitted to joints or terminal screws.”
61. An electrician is installing a flexible cord with an attachment plug to connect a portable tool to a permanent receptacle. According to the definition provided, what is the primary function of this device?To establish a connection between the conductors of the attached flexible cord and the conductors connected permanently to the receptacle. The rule defines an attachment plug specifically as the device that connects the flexible cord's conductors to the permanent receptacle's conductors.
    29 CFR § 1926.449: “A device which, by insertion in a receptacle, establishes connection between the conductors of the attached flexible cord and the conductors connected permanently to the receptacle.”
62. An electrician is working on a portable cable system over 600 volts and needs to make a splice. Under what condition is this splice permitted?The splice is of the permanent molded, vulcanized, or other approved type. Splices in portable cables over 600 volts are only allowed if they are permanent molded, vulcanized, or otherwise approved types.
    29 CFR § 1910.305(h): “Portable cables may not be operated with splices unless the splices are of the permanent molded, vulcanized, or other approved type.”
63. An electrician is installing service conductors as open conductors near a building. What is the minimum clearance required from windows that are designed to be opened?914 mm (3.0 ft). The regulation requires a minimum clearance of 3.0 feet from openable windows for service conductors installed as open conductors.
    29 CFR § 1910.304(c): “Service conductors installed as open conductors or multiconductor cable without an overall outer jacket shall have a clearance of not less than 914 mm (3.0 ft) from windows that are designed to be opened, doors, porches, balconies, ladders, stairs, fire escapes, and similar locations.”
64. Regarding the scope of temporary wiring provisions, when must temporary wiring be removed?Immediately upon completion of construction or the purpose for which the wiring was installed. The rule requires immediate removal of temporary wiring once the construction phase or specific purpose is complete.
    29 CFR § 1926.405(a): “Temporary wiring shall be removed immediately upon completion of construction or the purpose for which the wiring was installed.”
65. An electrician is installing a surface-mounted enclosure where a nonmetallic sheath cable enters through a nonflexible raceway. To qualify for the exception that allows the cable not to be secured to the enclosure, what is the required length range for the raceway?Not less than 457 mm (18 in.) or more than 3.05 m (10.0 ft). The exception for not securing the cable applies only if the raceway length is between 18 inches and 10 feet.
    29 CFR § 1910.305(b): “However, where cable with an entirely nonmetallic sheath enters the top of a surface-mounted enclosure through one or more nonflexible raceways not less than 457 mm (18 in.) or more than 3.05 m (10.0 ft) in length, the cable need not be secured to the cabinet, box, or enclosure provided all of the following conditions are met:”
66. An electrician is installing a temporary lighting string outdoors for a construction site. To ensure the installation qualifies as 'Festoon lighting' under the definitions provided, what is the minimum distance required between the two suspension points?More than 15 feet (4.57 m) apart. The definition requires the suspension points to be more than 15 feet apart to classify the string as festoon lighting.
    29 CFR § 1926.449: “Festoon lighting. A string of outdoor lights suspended between two points more than 15 feet (4.57 m) apart.”
67. An electrician is installing temporary wiring on a construction site and needs to run branch-circuit conductors. Which of the following is prohibited for these conductors?Laying them on the floor. The rule forbids laying branch-circuit conductors on the floor, while allowing the other listed methods.
    29 CFR § 1926.405(a): “No branch-circuit conductors shall be laid on the floor.”
68. A worker is inspecting electrical cords on a construction site before use. According to OSHA rules, which condition of a cord prohibits its use?The cord is worn or frayed. The standard bans the use of cords that are worn or frayed, while other conditions like dust or length are not prohibited by this specific rule.
    29 CFR § 1926.416(e): “Worn or frayed electric cords or cables shall not be used.”
69. A construction worker is installing temporary wiring and needs to provide access to the working space about electric equipment. What are the minimum dimensions for at least one entrance?24 inches wide and 6 feet 6 inches high. The standard requires a single entrance of at least 24 inches in width and 6 feet 6 inches in height for access to the working space.
    29 CFR § 1926.403(j): “At least one entrance not less than 24 inches (610 mm) wide and 6 feet 6 inches (1.98 m) high shall be provided to give access to the working space about electric equipment.”
70. When an electrician uses flexible nonmetallic tubing to separately enclose conductors in a dry location, what is the maximum length allowed for a continuous length of tubing?4.57 m (15.0 ft). The rule states that flexible nonmetallic tubing must be in continuous lengths not exceeding 4.57 meters (15.0 feet).
    29 CFR § 1910.305(a): “The tubing shall be in continuous lengths not exceeding 4.57 m (15.0 ft) and secured to the surface by straps at intervals not exceeding 1.37 m (4.5 ft).”

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