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Safety Standards & Compliance Flashcards

7 cards from real CEP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Safety Standards & Compliance flashcards as text

  1. Which NEC section requires arc-fault circuit interrupter (AFCI) protection for branch circuits supplying outlets in dwelling unit bedrooms?

    Answer: NEC 210.12

    NEC 210.12 requires AFCI protection for branch circuits supplying outlets in bedrooms and, in recent editions, most living spaces of dwelling units.

  2. What is the significance of the 'available fault current' calculation when designing an electrical system?

    Answer: It ensures that all overcurrent devices are rated to interrupt the maximum possible short-circuit current

    Available fault current calculations ensure that every overcurrent protective device has sufficient interrupting capacity to safely clear a bolted short-circuit fault without catastrophic failure.

  3. According to NFPA 70B, what is the recommended frequency for thermographic (infrared) inspections of electrical switchgear in industrial facilities?

    Answer: Annually, or more frequently in harsh environments

    NFPA 70B recommends annual thermographic inspections of electrical equipment, with more frequent inspections in harsh or high-duty-cycle environments.

  4. Under NEC Article 430, what is the maximum allowable size of an inverse time circuit breaker used as the branch-circuit short-circuit and ground-fault protective device for a motor with a full-load current of 20A?

    Answer: 250% of FLA = 50A

    NEC 430.52 Table allows an inverse time circuit breaker to be sized up to 250% of motor full-load amperes for short-circuit protection, giving a maximum of 50A for a 20A FLA motor.

  5. What is the purpose of the 'flash hazard analysis' or incident energy analysis required by NFPA 70E?

    Answer: To calculate the incident energy at a worker's face and hands so appropriate PPE can be selected

    The incident energy analysis calculates the thermal energy released at a working distance during an arcing fault so that PPE with a sufficient arc rating can be selected to protect the worker.

  6. Per NEC 250.122, what factor primarily determines the minimum size of an equipment grounding conductor?

    Answer: The ampere rating of the overcurrent protective device protecting the circuit

    NEC Table 250.122 sizes the EGC based on the rating of the overcurrent device protecting the circuit, ensuring the EGC can carry fault current long enough for the device to operate.

  7. Which OSHA standard requires employers to establish, implement, and enforce an electrical safety program for employees who work on or near electrical hazards?

    Answer: OSHA 1910.331–.335

    OSHA 1910.331–.335 (Electrical Safety-Related Work Practices) requires employers to establish safety programs covering training, work procedures, and protective equipment for employees exposed to electrical hazards.