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When installing polyvinyl chloride conduit (PVC) or reinforced thermosetting resin conduit (RTRC) as a Class I, Division 1 wiring method for an underground installation in a tank farm area, which statement is not true? A. The conduit(s) must be installed with 24 in. of cover over the top of the concrete, which encases the conduit. B. The conduit(s) must be covered by at least 2 in. of concrete. C. The conduit(s) must be encased in a concrete envelope by at least 2 in. of concrete....More

Fill in the blank with the appropriate answer. When installing a ventilating duct in a transformer vault, per Part III of Art. 450, the duct shall be constructed of material that is ____________. A. Acceptable to the Authority Having Jurisdiction (AHJ) B. suitable C. fire resistant D. flame retardant Answer: C...More

Fill in the blank with the appropriate answer. Type ITC cables (instrumentation tray cable) shall not be installed with power, lighting, or Class 1 circuits that are not power limited, or non-power-limited circuits, except ___________ . A. where terminated within equipment or junction boxes and separations are maintained by insulating barriers or other means. B. where a metallic sheath or armor is applied over the nonmetallic sheath of the Type ITC cable. C. as permitted by B or C. Answer: C...More

Q. Exposed non-current-carrying metal parts of small wind electric systems, such as towers, turbine nacelles, other equipment, and conductor enclosures shall be connected to an equipment grounding conductor [in accordance with 250.134 or 250.136(A)] at what voltage level? A. All voltage levels B. 50V or more C. 600V or more D. 1,000V or more Answer: A...More

When installing outdoor luminaires, you must place the fixtures below all energized conductors, transformers, or other electric utilization equipment, unless _________ ....More

Q. When are conductors permitted to be terminated based on the 90°C temperature rating and ampacity as given in Table 310.60(C)(67) through Table 310.60(C)(86)?...More

In a Class I Division 2 location, when is it permissible to omit the normally required bonding jumper (of the wire type in compliance with 250.102) for liquidtight flexible metal conduit?...More

Thermal insulation shall not be installed above a recessed luminaire or with 3 inches of the recessed luminaires' enclosure, wiring compartment, ballast, transformer, LED driver, or power supply, unless the luminaire is identified as ______ ?...More

In general, without exception, the main disconnecting means for an electrically driven or controlled irrigation machine shall meet which of the following requirements?...More

When installing loudspeakers in fire resistant-rated partitions, walls, and ceilings, the loudspeakers shall be ________....More

Where flexible metal conduit (FMC) is installed, and where flexibility is not required after installation, an equipment grounding conductor is required or is not required to be installed in a flexible metal conduit?...More

In accordance with Art. 800, when installing communications wires and cables in a raceway, what is the maximum percent fill permitted in EMT?...More