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OSHA Elec test topic: electrical PPE
14 test-style questions with the answer and the exact rule.
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- An industrial worker is inspecting the dedicated space above an indoor panelboard. The space extends from the top of the equipment to the structural ceiling. Under what condition are foreign systems (such as piping or ducts) permitted in this specific upper area?If protection is provided to avoid damage from condensation, leaks, or breaks. Foreign systems are generally prohibited in the dedicated space above the equipment unless specific protection against leaks, breaks, or condensation is installed.29 CFR § 1910.303(g): “The space equal to the width and depth of the equipment shall be kept clear of foreign systems unless protection is provided to avoid damage from condensation, leaks, or breaks in such foreign systems. This area shall extend from the top of the electric equipment to the structural ceiling;”
- An electrician is inspecting the working space in front of a switchboard. Other associated equipment is mounted directly above the switchboard. What is the maximum distance this upper equipment may extend beyond the front of the switchboard?153 mm (6 in.). Associated equipment located above or below the main electrical equipment is allowed to protrude into the working space by no more than 6 inches.29 CFR § 1910.303(g): “However, other equipment associated with the electrical installation and located above or below the electric equipment may extend not more than 153 mm (6 in.) beyond the front of the electric equipment.”
- When inspecting a flexible cord used for general wiring, what marking requirement must the cord meet to be considered compliant?It must be durably marked on the surface at intervals not exceeding 24 inches with type, size, and number of conductors. The rule specifies that flexible cords must be durably marked at intervals no greater than 24 inches with the type designation, size, and number of conductors.29 CFR § 1910.305(g): “Types S, SC, SCE, SCT, SE, SEO, SEOO, SJ, SJE, SJEO, SJEOO, SJO, SJT, SJTO, SJTOO, SO, SOO, ST, STO, and STOO flexible cords and Types G, G-GC, PPE, and W flexible cables shall be durably marked on the surface at intervals not exceeding 610 mm (24 in.) with the type designation, size, and number of conductors.”
- A worker is routing lead-in conductors from an outdoor radio transmitter near a building equipped with lightning protection conductors. What is the minimum required clearance between the lead-in conductors and the lightning protection conductors?6 feet (1.83 m). The rule mandates a minimum clearance of 6 feet to prevent accidental contact or interference.29 CFR § 1926.408(c): “The clearance between lead-in conductors and any lightning protection conductors shall not be less than 6 feet (1.83 m).”
- A technician is servicing a hoisting mechanism and needs to ensure the load block does not exceed its safe travel limit. What specific device is required to prevent the load block from passing the safe upper limit of travel?A limit switch or other device. The rule mandates the installation of a limit switch or equivalent device to automatically stop the hoist before the load block exceeds its safe upper travel limit.29 CFR § 1926.406(a): “A limit switch or other device shall be provided to prevent the load block from passing the safe upper limit of travel of any hoisting mechanism.”
- A worker is using rubber insulating gloves for electrical work, and the insulating material is subject to damage during use. What must be done to protect the insulating material?The insulating material shall be protected, for example by an outer covering of leather. The regulation states that if the insulating capability is subject to damage, the material must be protected, citing leather coverings as a common method.29 CFR § 1910.335(a): “If the insulating capability of protective equipment may be subject to damage during use, the insulating material shall be protected. (For example, an outer covering of leather is sometimes used for the protection of rubber insulating material.)”
- An electrician is installing a junction box containing a terminal block where a copper conductor and an aluminum conductor will physically touch inside the connector. Under what specific condition is this intermixing of dissimilar metals permitted?If the device is identified for the purpose and conditions of use. The regulation prohibits mixing dissimilar metals in a terminal unless the connector itself is listed or identified for that specific combination.29 CFR § 1910.303(c): “Conductors of dissimilar metals may not be intermixed in a terminal or splicing connector where physical contact occurs between dissimilar conductors (such as copper and aluminum, copper and copper-clad aluminum, or aluminum and copper-clad aluminum) unless the device is identified for the purpose and conditions of use”
- An electrician is routing open conductors through a wall partition. To prevent contact with the wall material, what type of material must the tubes or bushings be made of?Noncombustible, nonabsorbent insulating material. The rule requires that tubes or bushings separating conductors from structural elements be noncombustible and nonabsorbent.29 CFR § 1910.305(a): “Open conductors shall be separated from contact with walls, floors, wood cross members, or partitions through which they pass by tubes or bushings of noncombustible, nonabsorbent insulating material.”
- An industrial worker is handling unsealed batteries in a charging area. What personal protective equipment (PPE) is required by the standard?Face shields, aprons, and rubber gloves. The rule specifically lists face shields, aprons, and rubber gloves as the required PPE for workers handling batteries or acids.29 CFR § 1926.441(a): “Face shields, aprons, and rubber gloves shall be provided for workers handling acids or batteries.”
- A worker is selecting a conduit type to hold wires in a wet location. Based on the definition of 'Raceway,' which of the following is listed as a type of raceway?Liquidtight flexible metal conduit. Liquidtight flexible metal conduit is listed in the rule as a type of raceway, whereas the other options are not listed in this definition.29 CFR § 1926.449: “Raceways may be of metal or insulating material, and the term includes rigid metal conduit, rigid nonmetallic conduit, intermediate metal conduit, liquidtight flexible metal conduit, flexible metallic tubing, flexible metal conduit, electrical metallic tubing, underfloor raceways, cellular concrete floor raceways, cellular metal floor raceways, surface raceways, wireways, and busways.”
- An industrial worker is connecting a No. 12 copper conductor to a terminal using a pressure connector. To comply with the requirement for ensuring a good connection without damaging the conductor, which method is permitted for this size conductor?Wire binding screws or studs and nuts having upturned lugs. The rule allows No. 10 or smaller conductors to use wire binding screws or studs with upturned lugs, whereas other methods listed are not permitted for this specific connection type in the rule.29 CFR § 1910.303(c): “However, No. 10 or smaller conductors may be connected by means of wire binding screws or studs and nuts having upturned lugs or equivalent.”
- An electrician is installing a limit switch on a new overhead hoisting mechanism. What is the primary safety function this device must perform?Prevent the load block from passing the safe upper limit of travel. The regulation mandates a limit switch to stop the load block from exceeding the safe upper travel limit.29 CFR § 1910.306(b): “A limit switch or other device shall be provided to prevent the load block from passing the safe upper limit of travel of any hoisting mechanism.”
- An electrician is selecting a cable type for a factory assembly where one or more conductors are insulated with highly compressed refractory mineral insulation and enclosed in a liquidtight and gastight continuous copper or alloy steel sheath. Which cable type matches this description?Mineral-insulated metal-sheathed cable (Type MI). The definition of Type MI cable specifically describes the use of highly compressed refractory mineral insulation and a liquidtight/gastight continuous metal sheath.29 CFR § 1910.399: “Mineral-insulated metal-sheathed cable (Type MI). Type MI, mineral-insulated metal-sheathed, cable is a factory assembly of one or more conductors insulated with a highly compressed refractory mineral insulation and enclosed in a liquidtight and gastight continuous copper or alloy steel sheath.”
- An electrician is using circuit breakers as switches in 120-volt fluorescent lighting circuits. What specific marking must appear on the breakers?SWD. Breakers used as switches in this specific application must be marked SWD.29 CFR § 1926.404(e): “If used as switches in 120-volt, fluorescent lighting circuits, circuit breakers shall be marked “SWD.””