Since the 2014 edition, 240.21(B)(1)(1)(b) has allowed a 10 ft feeder tap to terminate on "equipment containing an overcurrent device" as an alternative to terminating directly on an OCPD. I would like to connect utilization equipment (in this case, EVSE for vehicle charging) to a feeder tap. The EVSE manufacturer asserts that, because there is…(Show moreShow less)
I have a question on the 2020 NEC code – definition of a term. In Article 100 (70-35) there is a definition for “Dwelling Unit”. It states: A single unit ….. My question is what is the definition of “single unit”? Plus, specifically: Could this be an apartment in a complex of many apartments or an apartment in a very large high rise…(Show moreShow less)
Good Afternoon, I have a question hopefully I can get some help on. I was troubleshooting a recepticle in co-op apartment that is not working. I went to the circuit breaker panel and when I opened the panel door I noticed the ground going out to all the receptacles is tied to the neutral bar and there is no ground tied to the actual ground…(Show moreShow less)
Based on what I see this wiring most likely is pre 1999 when the NEC adopted the separation rule. If this is a multi family building there may be main not even be main breakers at the service just meters.
I have a office that needs to have power for a refrigerator.. Put I have only 2 options 1. run a new line to the appliance 2. run a extension cord with a gfci.. I know i can do the first one. But the second not so sure. Any answers Thanks
You really don't have a choice. 2017 NEC Section 400.12(1) prohibits the use of extension cords as a substitute for the fixed wiring of a structure. Also, take a look at the owner's manual. Manufacturers of refrigerators, air conditioners, and similar appliances typically state that the appliance must not be operated using an extension cord.
Hello everyone, I am working on an emergency lighting scheme for a hospital and the client wants this to be done as per NFPA 101. I am just wondering if there's a guide that clearly shows the emergency lighting lux level required per space in healthcare projects ? I am reading about NFPA but unlike other standards I cannot find well defined…(Show moreShow less)
Pre-action vs dry pipe sprinkler systems, high and low air pressure monitoring. I am designing a new pre-action system that is arranged for double interlock with smoke detection for activation of solenoid. I know that per NFPA 72, dry pipe sprinkler systems require high and low air pressure alarms to be monitored but is this also true for…(Show moreShow less)
22.214.171.124.1 Extraction and post oil processing operations including dispensing of flammable liquids between containers, shall be performed in one of the following locations: A chemical fume hood in accordance with Chapter 7 of NFPA 45 An approved exhaust system installed in accordance with NFPA 91 or the mechanical code Per NFPA 70 -…(Show moreShow less)