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Can a product be designed to be installed completely hidden inside of an electrical box? Maximum draw 200mA. Communicates via Bluetooth and WiFi. Would this violate any existing NEC or NFPA rule?    Use case: user does not want a product that is plugged into a regular electrical socket because of one or more of the following reasons: 1) There… (Show more)
in Electrical
I have a project that takes storm water (not sewage) via gravity flow into an underground storage system (all debris has been removed prior to entering storage). This water will be treated via recirculation using a well pump that will be housed inside a 72" diameter manhole that is 50 feet deep. And there will be another pump that pumps the… (Show more)
in Electrical
How often should an Arc Flash  Analysis Survey be updated?
in Electrical
Do custom electrical control panels for equipment have to be UL listed/ have UL components?
in Electrical
Can power strips be used to power permanent fixtures? 
in Electrical
Can you use the, conduit to support light fixture.. EMT  ... The light  would be hanging from the conduit , which is horizontally mounted. And lights will be  secured in the middle of the conduit. No all thread, nothing else .. Just useing the conduit to hold up the lights   ...
in Electrical
Hi, NFPA 33, Section A.6.2.5 The temperature of the object or material being coated should be maintained at least 28° C (50° F) below the autoignition temperature of the powder. 28° C is 82.4° F 10° C is 50° C so my question is:  Is 28° C or 10° C correct? To be on the safe side I used 28° C. I believe this part has a typo error 28° C is… (Show more)
in Electrical
Can I put electric in-floor heating (Schluter Dittra) in a large master walkin closet?
in Electrical
I'm working on a plan review where the extraction room is classified as Class I Div II.   From everything I can pull up, this area would be Class I Div I.  Can anyone shed some light on this for me?  Should I assume - that the engineered ventilation system having so many air changes per hour can reduce the hazard down to Class I Div II ?  Anyone… (Show more)
in Electrical
I work at a paint plant that uses solvents extensively. Most of our operations occur in Class 1 Division 1 environments. We want to install a can washer and would be using a conductive solvent to clean them. The nozzle would go down in the can and the force of the stream may cause the can to rise. So I will not have a good connection to ground.… (Show more)
in Electrical
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