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chiefns830
My question has to do with ampacity of feeder conductors in parallel. Parallel feeds must follow 310.10(H), last time I checked. 310.10(H) states that it's only allowed if one follows 310.10(H)(2) through 310.10(H)(6) 310.10(H)(4) requires an ampacity adjustment per 310.15(B)(3)(a) ASSUME NEUTRAL IS A CONDUCTOR 310.15(B)(3)(a) states that for… (Show more)
in Electrical
epatterson@jmeuc.com
A 45KVA transformer located in the basement, 460 volt 3 phase primary out to a 120/208 volt 3 phase circuit breaker panel on the second floor of a 2 story building. The primary protection is a 460 volt 3 pole breaker of the correct size in the same room as the transformer. The load center is location on the 2nd  floor. The transformer is not wired… (Show more)
in Electrical
seyhun.ramazanov
Hello, we imported Electron-Beam Welding machine from EU to US. We invited UL inspector for the Field Inspection and received a lot of comments. While we working on UL's coments, our city's electric engineer refuses to approve the electric permit that we have open for connecting equipment to the electrical grid. Does City has authority to demand… (Show more)
in Electrical
jmerati
From the very beginning of my exposure to the NFPA 70E I have been taught that if I am inside the limited approach boundary with exposed energized conductors i have to wear appropriate ARC rated PPE.  My management is telling me that only inside the ARC flash boundary am I required to wear PPE.  I have been looking through ht e 70E and all I keep… (Show more)
in Electrical
rcramereleceng
What is the correct fuse rating to provide short-circuit protection for a 100 HP, 200 V, 3 phase, wound rotor motor? A. 200A B. 250A C. 300A D. 110A    This question is on a test for Residential Electrician Training.  None the less, my real world applications with Wound Rotor Motors has been existing - as opposed to Design.  My request is for… (Show more)
in Electrical
chiefns830
A dwelling has an attached garage. The garage receptacle must be GFCI protected if:   It is a 30-amp, single phase receptacle It is a 20-amp, single phase receptacle It is rated 60-amp, 240-volt, and within 6-foot of a sink a and b only b and c only b only
in Electrical
killerbabe79
Whats the minimum size, general - use snap switch, for a 1 1/2 HP, single phase, 230 V, AC Motor ? I have searched everywhere in the codes. Not sure how to get the correct calculation. Residential Electrician, apprentice
in Electrical
rde@homcorenaissance.com
Requesting clarification on NFPA 70, NEC Handbook 2017: 620.24 Branch Circuit for Hoistway Pit Lighting and Receptacle (A) Separate Branch Circuits. Separate branch circuits shall supply the pit lighting and receptacles.  1. Required lighting shall not be connected to the load side of the ground fault current interrupter.    Does the above… (Show more)
in Electrical
gigconroy
I work for a dredge company working aboard a vessel. I am confused by the "Extension Cord" issue. The company likes to refer to the OSHA rules as they are tied to the shore side of operations as well. Where I am only aboard a ship, the rules are not always the same. I have to contend with the CFR46, American Bureau of Shipping (ABS), NFPA 70 2002,… (Show more)
in Electrical
chiefns830
I have two, large commercial chillers.  One will operate at any given time.  The designer is attempting to use an ATS to switch between which chiller will operate.  I'm told that there will be a "remote switch" inside the building that will activate the ATS to switch over to the other chiller.   I'm asking if this is a listing violation.  An ATS… (Show more)
in Electrical
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