Don't assume that even the most "simple" electrical jobs aren't dangerous: http://archive.tcpalm.com/news/sebastian-handyman-charged-with-not-having-a-license-after-employee-dies-ep-396486835-347245332.html/
I live off the grid and in need of new battery's for my solar system. After a long study I believe a Lifepo4 system would be the best alternative for my needs. Lifepo4 has a safety factor that is so much better than any other system, but I have been told it is not allowed in a house. What are the restriction for LIfepo4 battery's.
I have monopole cell tower. The tower has DC conductor cables that run from equipment on ground to cell tower antennas, RRUs, etc up top. Kind of like this: or like this in web link below: https://wirelessestimator.com/wifi/images/uploads/Guying%20Monopole.jpg Does anyone here know do those DC conductor cables that run up to tower to…(Show moreShow less)
I have had a 300hp motor shipped to me with the motor opening being to small for the amout of leads that are coming out. So small infact that the motor leads insulation was being cut by the conduit adapter on the motor outlet cover. This adapter is a 2.5 inch adapter welded to the motor cover. There are 12) 1/0 motor leads and 1) 4/0 ground. If…(Show moreShow less)
Hello, I have a question in regard to NFPA70 article 250 and NFPA79 8.2.1 with EXCP and ECP. If a machine, ECP, has a part that can not be energized but is considered an EXCP per NFPA79 definition; does the EXCP need to be bonded to the same earth ground as ECP to prevent potential?
Assume that two SWGRs A and B are in compliance with NEC 2014 Section 230.2 first paragraph which says: For the purpose of 230.40 Exception no. 2 only, underground sets of conductors, 1/0 AWG and larger, running to the same locations and connected together at their supply end but not connected together at their load end shall be considered to…(Show moreShow less)
Attached sketch shows building layout bottom left corner, electrical room detail bottom right corner and Riser at top. Building layout shows Vacant space which has not been filled and Tenant A space occupancy type B. In the top middle of layout is electrical room. Electrical room detail shows main service SWGR as soon as one enters from…(Show moreShow less)
I have metallic trough load side of service disconnect means whose enclosure needs to be connected to the equipment grounding conductor. The trough has equipment grounding bus bar inside it. In attached Figure 1 right hand side Equipment grounding conductor (EGC) is incoming in trough terminates and connects to the equipment grounding bus bar.…(Show moreShow less)