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All questions and answers are based on the 2023 NEC.
Q1: Electric vehicle power export equipment (EVPE) and bidirectional electric vehicle supply equipment (EVSE) that incorporate a power export function shall be permitted to be a part of an interconnected power system operating in _____ .
a) series mode
b) tandem mode
c) parallel mode
d) island mode
Q2: Electrical nonmetallic tubing (ENT) shall be installed as a _____ system per Sec. 300.18 and shall be securely fastened in place by an approved means and supported in accordance with Sec. 362.30(A) and (B).
a) complete
b) underground
c) overhead
d) none of these
Q3: The vertical clearance of final spans of overhead conductors above or within _____ measured horizontally of platforms, projections, or surfaces that will permit personal contact shall be maintained per Sec. 225.18.
a) 3 ft
b) 6 ft
c) 8 ft
d) 10 ft
Q4: Alternating-current general-use snap switches shall only be used on ac circuits and may be used for controlling motor loads not exceeding _____ of the ampere rating of the switch at its rated voltage.
a) 70%
b) 80%
c) 110%
d) 125%
Q5: For circuit sizing and current calculation of photovoltaic (PV) systems, the maximum PV source current is equal to the sum of the short-circuit current ratings of the PV modules connected in _____ multiplied by 125%.
a) series
b) parallel
c) series-parallel
d) multiwire
Q6: To prevent the entrance of _____, service-entrance conductors shall be connected to the service drop or overhead service conductors either below the level of the service head or below the level of the termination of the service-entrance cable sheath.
a) rain
b) snow
c) ice crystals
d) moisture
Answers:
Q1: d) island mode
Section 625.49 states, "EVPE and bidirectional EVSE that incorporate a power export function shall be permitted to be a part of an interconnected power system operating in island mode."
Q2: a) complete
According to Sec. 362.30, "ENT shall be installed as a complete system in accordance with 300.18 and shall be securely fastened in place by an approved means and supported in accordance with 362.30(A) and (B)."
Q3: a) 3 ft
Per Sec. 225.19(D)(2): "The vertical clearance of final spans above or within 3 ft measured horizontally of platforms, projections, or surfaces that will permit personal contact shall be maintained in accordance with 225.18."
Q4: b) 80%
Section 404.14(A)(4) confirms, “Motor loads not exceeding 80% of the ampere rating of the switch at its rated voltage."
Q5: b) parallel
Per Sec. 690.8(A)(1)(a)(1): "The maximum current shall be the sum of the short-circuit current ratings of the PV modules connected in parallel multiplied by 125%."
Q6: d) moisture
As stated in Sec. 230.54(F), "To prevent the entrance of moisture, service-entrance conductors shall be connected to the service drop or overhead service conductors either (1) below the level of the service head or (2) below the level of the termination of the service-entrance cable sheath."
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