Questions and Answers
What is acceptable for the wiring of an optional standby system installed in the same raceway as the general wiring system?
Acceptable 702.10
A Class 1 power-limited circuit shall be supplied by a source that has a rated output of not more than 30 volts and _____?
1,000 VA 725.41(A)
Upon failure of the normal supply, a legally required standby system is required to be available in _____ or less.
60 seconds 701.12
Optional standby systems are intended to supply on-site generated power to selected loads either automatically or manually.
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Copper or aluminum solid or stranded conductors are permitted to be used for the installation of non-power-limited fire alarm circuits.
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Select the voltage(s) below that may supply a Class 1 non-power-limited circuit. I. 24 V II. 120 V III. 277 V IV. 600 V V. 1,000 V
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Where an emergency system is installed in accordance with the NEC, the source of power must be available within _____ of the loss of the normal supply.
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An installation calls for plenum-rated optical fiber cable to be installed. Which of the following cable types may be used for the installation?
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Branch-circuit overcurrent protective devices in a legally required standby circuit shall be _____?
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Class 2 cables shall have a minimum voltage rating of _____?
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The disconnecting means of the output of each DC source of a microgrid shall be _____?
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Fire-resistive cable assemblies shall be marked on their surface with the system type and the suffix _____?
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EMT is used to support power-limited fire alarm conductors.
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A(n) _____ must identify 15-ampere non-locking receptacles supplied by a COPS where other systems are present.
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Energy storage systems can include _____?
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Instrumentation tray cable with 22 AWG conductors has a maximum ampacity of _____?
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Load shedding provided by an energy management system shall not override the power supplied to which of the following?
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When connecting multiple sources of power in parallel with a primary source such as a utility, which article(s) must be consulted?
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A solar installation will be built to power a cabin that is off-grid. Which article(s) need to be consulted?
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Where Class 2 circuit conductors are in the same enclosure serving the same system as 120-volt power conductors, the conductors of the two systems shall be separated by _____?
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Emergency circuit raceway systems that are exposed shall be identified and marked every _____?
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Study Notes
NEC Chapter 7: Special Conditions
- Optional standby systems can share raceways with general wiring systems, as per NEC 702.10.
- Class 1 power-limited circuits should be powered by sources rated at a maximum of 30 volts and 1,000 VA (NEC 725.41(A)).
- Legally required standby systems must be operational within 60 seconds of normal supply failure (NEC 701.12).
- Optional standby systems are designed to provide generated power to specific loads, either automatically or manually (NEC 702.2).
- Non-power-limited fire alarm circuits can only use copper or aluminum conductors if stated otherwise (NEC 760.49(C): False).
- Class 1 non-power-limited circuits can be powered by 24 V, 120 V, 277 V, and 600 V (NEC 725.41(B)).
- Emergency systems must have power available within 10 seconds of losing normal supply (NEC 700.12).
- Plenum-rated optical fiber cable installation is restricted to specific types; if not listed, none are permitted (NEC 770.154).
- Branch-circuit overcurrent protective devices in legally required standby circuits must be accessible to authorized persons (NEC 701.30).
- Class 2 cables require a minimum voltage rating of 150 V (NEC 725.179(G)).
- Disconnects for each DC source in a microgrid must meet specific requirements (NEC 712.34).
- Fire-resistive cable assemblies must be marked with the system type and the suffix "FRR" (NEC 728.120).
- EMT cannot be used to support power-limited fire alarm conductors (NEC 760.143: Violation).
- An illuminated face must identify 15-ampere non-locking receptacles supplied by a Circuit Overcurrent Protective System (COPS) (NEC 708.10(A)(2)).
- Energy storage systems encompass a range of components (NEC 706.2: all of the above).
- Instrumentation tray cable with 22 AWG conductors has a maximum ampacity of 3 A (NEC 727.8).
- Energy management systems must ensure power supply to essential functions during load shedding (NEC 750.30(A): All of the above).
- Article 705 must be consulted for connecting parallel power sources to utility power (NEC 705.1).
- Solar installations for off-grid cabins must refer to Article 690 for regulations (NEC 690.1: both a. and d.).
- Class 2 circuit conductors and 120-volt power conductors must maintain a separation of 0.25 inches when in the same enclosure (NEC 725.136(D)).
- Exposed emergency circuit raceway systems must be marked and identified every 25 feet (NEC 700.10(A)(2)).
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Test your knowledge with flashcards based on NEC Chapter 7, which deals with special conditions in electrical wiring. Each card presents key concepts and definitions necessary for understanding optional standby systems and Class 1 power-limited circuits. Perfect for students or professionals looking to reinforce their knowledge of electrical codes.
