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jcsmith
NEC 250.34(B) allows omission of a grounding electrode connection for a vehicle-mounted generator when certain conditions are met; in short, when: The generator and vehicle frames are bonded together, Equipment powered by the generator is either mounted on the generator or supplied by receptacles mounted on the generator, Proper bonding is done
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arcon72
Can I install stainless steel hinge for fire rated door? Someone memtioned that NFPA (2013 edition) table 6.4.3.1 requires the use of steel hinges, NOT the use of stainless steel hinges.
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isaacmand
If I have a hypothetical 480/277V, 3 Phase, 4 wire feed to a distribution panel. (Spare panel for future use, we do not know the load) Do you de-rate because it is 4 wire? Following 310.15(B)(5)(c) If the majority is non-linear (meaning greater than 50%?) we would de-rate because of 4 wire. (Correct?) Or does this apply only to a branch circuit,
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moehring
Setup: turnstiles are less than 48" high in a multi-floor office building. Card reader on the unsecured side of the turnstile coming in. No reader on the outbound side of the turnstile, will open up upon presence of a person for an adjustable time.   If this turnstile is in the path of egress, do we need to have the turnstile open for
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elena.bertolotti
Hello, I am looking for data concerning the electric loads in the USA. Is there any official document stating how max is the electric load in the  private and public sector? Are there any statistics or studies related to it? I found a document on the website, but the document has problems in being downloaded. Can anyone help me in
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david.michel
I have had zero luck with this but several differing opinions   We were trying to judge the ampacity of an existing cable, 3 conductors 500KCM in one jacket or cable.   This cable is attached to building rafters, about 10 ft between rafters and the cable is surrounded by air above below beside and is indoors near roof  no other
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diu.siddik
Just few days ago had a training about https://catalog.nfpa.org/NFPA-72-National-Fire-Alarm-and-Signaling-Code-2019-3-day-Classroom-Training-with-Certificate-of-Educational-Achievement-P458.aspx NFPA 72 (2019) Classroom Training in Bangladesh, i participate there and gave the exam. There was a result and i dropped it but i was so confident
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