Electrical Codes & Standards Flashcards
7 cards from real Licensed Electrical Contractor practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Electrical Codes & Standards flashcards as text
NEC 110.26 requires a minimum clear working space in front of electrical equipment operating at 601V or less. For equipment with exposed live parts on one side and grounded parts on the other, what is the minimum depth of working space?
Answer: 3.5 feet
NEC Table 110.26(A)(1) Condition 2 requires 3.5 feet of working space depth for equipment with live parts on one side and grounded parts on the other.
Under NEC 240.4(D), which wire size is NOT permitted to be protected by a standard 20-ampere overcurrent device?
Answer: 14 AWG copper
NEC 240.4(D) limits 14 AWG copper conductors to a maximum 15-ampere overcurrent device, not 20 amperes.
According to NEC 334.15, where NM cable is run exposed on a wall surface, it must be protected from physical damage by installing it:
Answer: So it closely follows the wall surface or structural members
NEC 334.15(B) requires exposed NM cable to closely follow the surface of the building finish or of running boards.
NEC 410.130(G) requires luminaires installed in clothes closets to be what type?
Answer: LED or fluorescent enclosed types, surface-mounted or recessed
NEC 410.130(G) permits only enclosed LED or fluorescent luminaires surface-mounted or recessed in clothes closets to prevent fire hazards.
Under NEC 225.30, what is the maximum number of feeder or branch circuits allowed to supply an outside building or structure from a single service?
Answer: One feeder or branch circuit per voltage system
NEC 225.30 limits supply to one feeder or branch circuit per voltage system to an outside building or structure, with listed exceptions.
NEC 690.12 requires a rapid shutdown system for PV systems on buildings. Within how many seconds must PV system conductors inside the array boundary be de-energized after rapid shutdown is initiated?
Answer: 30 seconds
NEC 690.12(B)(2) requires PV conductors within the array boundary to be de-energized to 80V or less within 30 seconds of rapid shutdown initiation.
According to NEC 430.52, a dual-element (time-delay) fuse used for motor branch-circuit short-circuit and ground-fault protection shall not exceed what percentage of the motor full-load current?
Answer: 175%
NEC Table 430.52 allows dual-element time-delay fuses to be sized at a maximum of 175% of motor full-load current for short-circuit protection.