When is a conduit body, such as a capped elbow or a service-entrance elbow that has sufficient size to provide free space for all conductors enclosed in it, not permitted to contain a splice, tap or device?...More
With respect to the requirements of facilities that may house children for educational, supervisory, or personal care services, a child care facility, by definition, must have more than _____ children that are _____ years old or less....More
As addressed in the 2011 edition of the NEC, a 2-ft by 2-ft or 4-ft by 4-ft lay-in type fluorescent luminaire installed in a suspended ceiling shall be supported by which of the following means?...More
When installing the required branch circuit for an electric sign or outline lighting in a commercial building — including each occupancy, which has access to pedestrians — at least one outlet shall be supplied by a branch circuit that has a minimum rating of _______....More
Per 250.190(C), when installing 5kV-rated, metallic insulation shielded, current-carrying conductors, is it permitted to use the metallic tape insulation shield and drain wire as an equipment grounding conductor for a solidly grounded system?Note: The metallic insulation shield encircles the conductor....More
Per 250.190(B), when grounding a 5kV rated service disconnect operating at 4.16kV, what is the minimum size grounding electrode conductor for this service to connect the non-current metal parts of the metal-clad enclosure to ground?...More
When applying the new requirements for disconnecting means for circuits operating at more than 600V — including inspections and tests of instrument transformers, protective relays, switching circuits, control and signal circuits, and more — which organization is mentioned as a source of information with respect to testing specifications?...More
When enclosing electrical equipment in an outdoor installation, other than equipment as described in 110.31(D), what is the minimum distance required between the fence and the live parts when the nominal voltage is 34.5kV?...More
With respect to interconnected electric power production sources (Art. 705), is it required to automatically disconnect a 3-phase primary power source from all ungrounded conductors when one of the phases opens to create a loss of power on one or more phases?...More
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Download these Frequently Asked Questions, sponsored by Westex to learn more about FR Clothing. These FAQs discuss the benefits of arc rated clothing and how NFPA 70E applies.
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Facility Managers Turn to Smart Meters to Comply with LEED v4
With the introduction of LEED v4, facility managers face tougher metering requirements. In response, they are turning to advanced energy "smart meters" to easily access more granular energy data when measuring and verifying their building's energy consumption....More
The electrical industry spends hours participating in training in order to understand the revisions found in the 2014 NEC that will enhance electrical safety for our community. Electrical code revisions also serve as a significant catalyst that enables investment,...More
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