PC - Professional Electrical Contractor OSHA Safety Standards Questions and Answers

Question 1

An electrical contractor is setting up a temporary power supply on a construction site.
According to OSHA standard 1926.404, what is required for all 120-volt, single-phase, 15- and 20-ampere receptacle outlets on construction sites that are not part of the permanent wiring of the building?

Accepted Answer

They must have ground-fault circuit-interrupter (GFCI) protection.

Answer

They must be protected by a weather-resistant cover.

Answer

They must be connected to a circuit with a maximum of two outlets.

Answer

They must be inspected and approved by the general contractor daily.

Question 2

An electrician is tasked with de-energizing a circuit breaker in a panel to work on a lighting circuit. Which of the following is a key requirement of the OSHA standard for the control of hazardous energy (Lockout/Tagout), 29 CFR 1910.147?

Accepted Answer

A tag may be used by itself only if a lock is not feasible and the employer can demonstrate equivalent protection.

Answer

Only a licensed master electrician is permitted to apply a lockout device.

Answer

The key to the lock must be kept in a central, accessible location on the job site.

Answer

The circuit must be tested to verify it is energized before applying the lockout device.

Question 3

According to OSHA 29 CFR 1926 Subpart K, what is the minimum headroom of working spaces required around electrical equipment like switchboards, panelboards, or motor control centers that are 600 volts, nominal, or less?

Accepted Answer

6 feet, 3 inches

Answer

6 feet, 0 inches

Answer

6 feet, 6 inches

Answer

7 feet, 0 inches

Question 4

A qualified electrician is working on an energized electrical panel. Which of the following types of personal protective equipment (PPE) is MOST critical according to OSHA standards for protecting against arc flash hazards?

Accepted Answer

Arc-rated clothing and a face shield.

Answer

A standard hard hat and leather gloves.

Answer

A high-visibility safety vest.

Answer

Steel-toed boots with slip-resistant soles.

Question 5

An electrical contractor's employee needs to use a portable ladder to access an overhead junction box. To comply with OSHA safety standards (29 CFR 1926 Subpart X), which of the following practices is prohibited?

Accepted Answer

Carrying a small tool, like a screwdriver, in one hand while climbing the ladder.

Answer

Using a fiberglass ladder when working near energized electrical conductors.

Answer

Maintaining three points of contact while climbing or descending the ladder.

Answer

Setting up the ladder on a firm, level surface away from doorways.

Question 6

Which of the following best describes the OSHA requirement for 'Guarding of live parts' under 29 CFR 1926.403(i)(2)?

Accepted Answer

Live parts of electric equipment operating at 50 volts or more must be guarded against accidental contact.

Answer

All live parts must be de-energized before an employee works on or near them.

Answer

Only live parts exceeding 120 volts require guarding by a permanent enclosure.

Answer

Guarding is only required in locations accessible to the general public, not on controlled construction sites.

An electrical contractor is setting up a temporary power supply on a construction site.According to OSHA standard 1926.404, what is required for all 120-volt, single-phase, 15- and 20-ampere receptacle outlets on construction sites that are not part of the permanent wiring of the building?

An electrical contractor is setting up a temporary power supply on a construction site.
According to OSHA standard 1926.404, what is required for all 120-volt, single-phase, 15- and 20-ampere receptacle outlets on construction sites that are not part of the permanent wiring of the building?