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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 conductors  …  … (Show more)
in Electrical
cakloiber
Good evening all!    NFPA 110, Article 5.6.5.6 mentions that a remote stop switch is necessary for generators.  Does anyone know if this switch has to be a physical one or can it be an electronic one?  Our site has one on a user interface screen, but not a physical, mechanical button.  Just want to get a feel for interpretation of the code on… (Show more)
in Electrical
Denyse DuBrucq
Greetings,     Here is what I'd like to achieve:     Evaporated Nitrogen gas is not a conductor of electricity.   (1) How can I get this in the electrical code(s)?  (2) Which ones?       Please find a reference article on what Evaporated Nitrogen gas is.     In the NFPA Code 2001, it is an entry under IG100 - Nitrogen gas. The difference… (Show more)
in Electrical
piyakarn ngamchokchaicharoen
Hi,   I have a warehouse about 50Wx50Lx10H m. It has only 2 external attached walls. Do we need to install the fire alarm detector?
in Electrical
Khaled Malsen
What is the minimum 35kV cable size that can be used for underground duct bank?
in Electrical
Patrick Fagerman
I think I can best express my question in the following Scenario:  Scenario: 1600A, 480v, 3-phase service entrance main breaker with only 3-phase loads is to be fed from a 480/277V, 3-phase utility transformer via (5) runs of 3#400kcmil THWN/THHN conductors.   Question: What is the required size of Grounded Conductor required in each raceway… (Show more)
in Electrical
Thomas Cotter
I was asked to size this service main bonding jumper with 12 sets of 750 kcmils and came up with 1125 kcmils bonding jumper(1250 kcmils next standard size). When I presented my findings everyone said it didn't have to be larger then a 750 kcmils but that's not the way I read 250.102(c). Can someone please clarify?
in Electrical
donald hoffman II
In article 110 we find the requirement of installing per the manufacturers listing and labeling. On the market are the UL Classified breakers. As an AHJ, the code appears to be silent on using these classified breakers in panels which always state to use their breakers.  Does any one know if or where the relevant documentation from the NEC… (Show more)
in Electrical
Scott Russ
For NFPA 70B, 2010, can someone interpret for me what types of facilities this document covers? Particularly, I am investigating a fire that occurred in a small commercial establishment (4 stories with basement, maybe 5 tenants, non-living quarters) with a 120/240VAC service, having an older Square-D 400A fused main disconnect. Claimant parties… (Show more)
in Electrical
Denyse DuBrucq
I have a question regarding NFPA Code 55, "where is liquid Nitrogen and its evaporated gas discussed?" and have lots of information to submit on the topic.   But being at XCHANGE, I only find what others submitted.  Where can I ask my question?
in Electrical
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