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I have to relocate an electrical distribution panel. It's electrical feeder only uses the conduit for ground. Can I use a splice box to connect the existing feeder to the new feeder and use the new conduit as the grounding means for the new panel? Would this be an approved grounding method per...

I need help with sizing the electrical feeder from the emergency generator to the automatic transfer switch. It is for a 50KW 208V/3PH, 0.8 pf, natural gas unit. The cut sheet says 173 amps Standby and 139 amps Prime. What amperage do i size it for? Thanks

can anyone help me figure out how to design a grounding system for the IT network of a school?

Where can I learn how to do a short circuit calculation? I need to select the short circuit protection rating for entrance equipment for a single family home 230V/1PH/200 amp service. How do i figure this out? website Links/tutorials would be great. Thank you.

How do I determine an impedance/resistance value (please correct me if I'm wrong) for a circuit (any voltage) such that I don't get a short circuit?

do these types of units require a neutral wire as well as 3 hot wires? don't they have devices in them that need 120 volt too?

What is the correct wire callout for a 208V/3PH/60Hz packaged air conditioning unit (cooling only) with the following electrical characteristics: minimum circuit amps = 28.7 amperes overcurrent protection = 45 amperes full load amps = 28 locked rotor amps = 156 Thank you

if i'm specifying a new main distribution panelboard (MDP) for a residence, say 208v/1phase, and i have the available short circuit amps from the utility company, then all i have to do to protect my electrical installation from the short circuit amps is make sure the ampere interrupt capacity...

does anyone know of any concerns with a person working in an electrical closet (9ft x 5ft) for a fews hours a day that has a couple of electrical distribution panelboards and a lighting dimming panel?

can a 120/277 volt compact fluorescent light fixture be installed in a 120/208 volt system?

some assistance, please, on basic electrical principles: why does all the electrical equipment (say in a residential building) such as service switches and panelboards need to have a greater ampere interrupt capacity (AIC) than the utility company maximum symmetrical short-circuit current...

what does "RMS symmetrical amperes" mean?

how are these calculations performed?

what could cause high induced voltage on a 110v line?

what happens or what can be done if the utility company current fault rating (13,000) is greater than the current fault rating of the equipment installed (10,000)?

is it acceptable to run (2) sets of electrical feeders from an end box to a service switch in the same conduit?

Section 220.16(c) of the New York City Amendments to the 2002 NEC, states: "A load, if not less than 1500 Volt-Amperes, shall be included for the air conditioning outlet required by 210.52(I)." Does this mean that a minimum of 1500 VA's has to be used in the load calcs. for each outlet, even...

in New York City, can a wire (say 12-3) be located in an electrical distribution panel but not be connected to a circuit breaker ? In other words, keep it there for future use?

i need some help specifying a "power cleaner" for a high tech firm. i'm not familiar with how this is done. the firm will have 60 computer workstations with 2 lcd monitors at each station.

does anyone now a web site that has motor hp, fla & lra info?