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Hello can anyone explain me the example given  in this section? In particular the second figure and why there are different values of 'n' depending on the distance from middle point. Thank you!
in Electrical
Steve Benton
According to the NFPA 70E, when are noncontact test instruments permitted to be used to verify absence of voltage in circuits less than 1000 volts? 
in Electrical
For a single family residence in NYC, is there an exemption to running low voltage plenum rated cables in an HVAC plenum? Or is it an absolute code requirement to run plenum rated cable in these spaces?   Thank you, Gaetano
in Electrical
Does anyone know of a checklist or an inventory or requirements per code that may apply to a specific industry or business. What I am really looking for is a summary list with requirements per each code. Something similar to the attachment. Maybe even an audit form to help narrow what standards apply. #Easy Code Finding Requirements
NEMA VE-2 states that metallic cable trays can be installed transversely (on their sides) but the NEC does not address this type of installation under 392. The manufacturers provide no structural or load ratings based on cable tray mounted on it’s side and only provide load data as per NEMA VE-1 which is tested on the horizontal orientation. It… (Show more)
in Electrical
Click to view contentSomeone please, inform me.  What is a "poke through?" Does this have an approved degree of detail? Is this meaning clear? Am I being unfair by not signing off on this?
in Electrical
Is there a minimum required spacing for electrical outlets (house keeping) along high rise commercial building common corridors?  Can they be spaced further apart than the standard 12'-0" rule?
in Electrical
Referring to NFPA 70E Table 130.7(C)(15)(A)(b) - Where is there more info, step-by-step, on how to go through the process in this table? I can't find any links and there's nothing in the annexes for this. I would hope to get a better understanding of this table in the annex along with the others in  Annex D.
in Electrical
I have two tablets mounted on the wall in a fixture, the Micro-USB charging cords run through the fixture and then through the wall to individual power adaptors that are plugged into a UPS.  The power adaptors have normal input and output for a "charger" (100-240V at 50-60Hz .35A in and 5V at 2.1A out).  Even though this is low voltage, I see it… (Show more)
in Electrical
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