Re: John T,,

Posted by John T on September 22, 2006 at 08:09:31 from (66.244.90.5):

In Reply to: John T,, posted by ChadS on September 22, 2006 at 06:50:36:

Chad, FIRST THING you gotta do is check with your Electric Utility Provider cuz I dont envision them real willing to provide you with TWO 100 amp services. The normal utility procedure is to use a single meter base (100 or 200 amp) and then a 100 or 200 amp main service entrance panel fed from the pole with EITHER 100 or 200 amp wire. If you only have 100 amp wire ran to your home, you cant create a situation where you overload those existing feeders beyond 100 amps you know........(but it sounds like youre already well aware of that)

NEXT FIRST THING lol you gotta get the utility out to check the meter base n service entrance, they ought to do that for free versus you hiring an electrician, you may have a fault or a bad neutral connection or something after that storm, or maybe the problems out on the pole or pad mount, again the utility's responsibiity???????????

NOWWWWWWWWW heres the deal on Panelboards.... If you have say a main 100 amp panel with a 100 amp main breaker,,,, the typically largest branch circuit breaker would be maybe 70 amps or so NOT 100 THE SIZE OF THE MAIN. Similar, if you have a 200 amp panel with a 200 amp main breaker, then you could indeed use a 100 or 120 amp or larger (as required but still as upper limited by the panelboard) branch circuit breaker to feed that furnace.

MY QUESTION IS how you gonna get the feeder wires from the pole transformer or pad mount for that "Extra 100 amp service" you want ??? Around here if youre allllllll electric the utility will furnish n trench the wires from the transformer to the meter base but if not youuuuuuuu furnish n run the wires from the transformer. Regardless who does it, youre gonna need aeiral twisted triplex or UF twisted triplex from the utility transformer but again, I dont see them liking youre hanging on 2 meter bases THEY ARE WHO DRIVES ALL THESE QUESTIONS

SUMMARY Have the utility out to check that problem,,,,,,,,,, ask if they are willing to furnish you another seperate 100 amp (or larger if needed) service from their transformer (regardless who runs the wire),,,,,,,,,,if NOT then you gotta break down n upgrade the wires n meter base n service entrance panel to 200 amps and sub feed the furnace with a 100 or 120 or so amp branch circuit breaker,,,,,,,,,If they ARE willing to let you run another 100 amp service from their transformer, see who has to furnish the wires and who has to run it .... In that situation you would need a utility provided meter base,,,,,,,a main service entrance disconnect (within 10 feet from entrance) and/or service entrance panelboard. I kinda see the 100 amp furnace service as a main breaker ONLY not any panelboard right????????

NOTE if 100 amps is in doubt, you can always run a 150 amp service for the furnace you know!!!!!!!!!!!!!!!!!!!!!

FINALLYYYYYYYY if they say "Hey no problem" heres a 100 amp meter base (or larger) so have at running the wires to our transformer and after inspecting the service entrance we will connect it...... MY QUESTION IS will that 100 amps suffice to feed that furnace WITHOUT tripping the 100 amp breaker??? As far as wire size, if its a long run and/or theres a problem tripping a 100 amp breaker on start up, to reduce voltage drop I would use a wire size LARGER like maybe 1 Gauge Copper (but wire sizing depends on in free air or raceways etc etc) ALSO AGAIN, you could run 150 amps service n bigger wires for the furnace. As my fellow EE friend Gerald points out, the NEC wire sizes are a minimum, so if voltage drops or long runs are a problem RUN LARGER WIRE NO PROBLEMMMMMMMMMMM.........

Around here and based on my experience an ALL ELECTRIC home ESPECIALLY if an electric resistive furnace NOT a heat pump or geo thermal, a 200 amp service is like the minimum, how you get by with 100 amps iffffff the furnace is straight electric resistive?????? You have a resistive electric furnace right???????? With only a 100 amp service it seems questionable you could run a pure resistive electric furnace (NOT heat pump/geothermal) in an alllllll electric home...........

DISCLAIMER I been longgggggggg retired as an electrical design engineer and am rustyyyyy on the NEC and am toooooooo lazy to look up wire sizes etc lol sooooooooo dont bet your life on any of this versus what a current practicing electrician or engineer might tell you butttttttttttttt regardless, its really what the Utility Provider tells you that counts, they will NOT hook up unless n until it meets THEIR requiremets as far as wire size n 100 or 150 amp service n seperate services etc sooooooooooo CHECK WITH THEM FIRSTTTTTTTTTTT

Still hope this helps provide some basic guidance, best wishes, God Bless, stay safeeeeee

John T Nordhoff in Indiana long retired EE

Replies:

• Re: John T,, ChadS 10:08:17 09/22/06 (1)
  • Re: John T,, John T 10:56:24 09/22/06 (0)

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