Courtesy of www.MikeHolt.com.
All questions and answers are based on the 2023 NEC.
Q1: Equipotential planes shall be installed adjacent to all outdoor service equipment or disconnecting means that control equipment in or on water in marinas and docking facilities where the system voltage exceeds _____ to ground.
a) 120V
b) 125V
c) 220V
d) 250V
Q2: Areas designated as hazardous (classified) locations or determined to be unclassified shall be _____ and shall be available to the authority having jurisdiction and those authorized to design, install, inspect, maintain, or operate electrical equipment at these locations.
a) cleaned
b) documented
c) maintained
d) all of these
Q3: The _____, and other characteristics of the circuit to be protected shall be selected and coordinated to permit the circuit protective devices used to clear a fault to do so without extensive damage to the electrical equipment of the circuit.
a) overcurrent protective devices
b) total impedance
c) equipment short-circuit current ratings
d) all of these
Q4: Where a mast is used for overhead branch-circuit or feeder conductor support, it shall have adequate _____ or be supported by braces or guy wires to safely withstand the strain imposed by the conductors.
a) strength
b) mobility
c) length
d) size
Q5: An equipment bonding jumper can be installed on the outside of a raceway, provided the length of the equipment bonding jumper is not more than _____ long and the equipment bonding jumper is routed with the raceway.
a) 3 ft
b) 4 ft
c) 5 ft
d) 6 ft
Q6: If a/an _____ or less overcurrent protective device is an adjustable trip device installed in accordance with Sec. 240.4(B)(1), (B)(2), and (B)(3), it shall be permitted to be set to a value that does not exceed the next higher standard value above the ampacity of the conductors being protected as shown in Table 240.6(A) where restricted access in accordance with Sec. 240.6(C) is provided.
a) 600A
b) 800A
c) 1000A
d) 1,200A
Answers:
Q1: d) 250V
Section 555.14(A)(1) specifies, "Where the system voltage exceeds 250V to ground."
Q2: b) documented
Per Sec. 500.4: "Areas designated as hazardous (classified) locations or determined to be unclassified shall be documented on an area classification drawing and other associated documentation. This documentation shall be available to the AHJ and those authorized to design, install, inspect, maintain, or operate electrical equipment at the location."
Q3: d) all of these
Section 110.10 states, "The overcurrent protective devices, total impedance, equipment short-circuit current ratings, and other characteristics of the circuit to be protected shall be selected and coordinated to permit the circuit protective devices used to clear a fault to do so without extensive damage to the electrical equipment of the circuit."
Q4: a) strength
According to Sec. 225.17(A), "The mast shall have adequate strength or be supported by braces or guy wires to safely withstand the strain imposed by the overhead feeder or branch-circuit conductors."
Q5: d) 6 ft
Per Sec. 250.102(E)(2): "If installed on the outside, the length of the bonding jumper or conductor or equipment bonding jumper shall not exceed 6 ft and shall be routed with the raceway or enclosure."
Q6: b) 800A
The requirements of Sec. 240.4(B) apply to "Overcurrent devices rated 800A or less."
These materials are provided by Mike Holt Enterprises in Leesburg, Fla. To view Code training materials offered by this company, visit www.mikeholt.com/code.
