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Tool Talk Discussion Forum

Re: Transfer switches

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John T

08-04-2013 05:38:07

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While there are indeed more then one legimitate and perfectly code compliant methods, my preference as an engineer was to use the simpler method where the Transfer Switch selected EITHER the Utility to feed the homes exisitng Main Panel ORRRRRRRR the Genset fed the exisitng Main Panel.....Its so easy to switch ON ONLY the loads you wish to use and the others OFF when the genset is the selected source of power if it lacks capacity to power everything.

The Main Panel receives power FROM THE TRANSFER SWITCH (NOT the Utility as normal) ,,,,,,The Switch is wired to TWO possible sources, the Utility orrrrrrrrr the Genset. PIECE OF CAKE TO WIRE AND USE AND no rewiring or reconnecting some loads one place or another ALL LOADS ARE ALREADY FED FROM THE MAIN PANEL AND IN PLACE simply turn a few off as/if necessary.

ALSO you only need to use a TWO POLE TRANSFER SWITCH and you DO NOT have to switch the Neutrals PROVIDED the Genset isnt configured as a Seperately Derived Source!!!!!!!

Still there are cost considerations and convenience and other factors where another method may work best in ones own particular situation SO TAKE A LOOK AND SEE and consult local authority and utilitly and professional electricians and engineers!!!!!!!!!

Your money your situation your choice, we report now you decide

John T

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08-04-2013 15:49:55

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 Re: Transfer switches in reply to John T, 08-04-2013 05:38:07  
True, you only NEED a two pole transfer switch, but my thinking is, it's better to switch the neutral also. I've heard of the utility workers switching a hot and a neutral on the pole and burning down houses!

any reason not to use a 3 pole, double throw switch before the panel and be done with it?

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John T

08-05-2013 06:01:14

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 Re: Transfer switches in reply to mazemeister, 08-04-2013 15:49:55  
The Utility Neutral has a tie to mother earth ground at the pole and theres another tie to mother earth ground at the service entrance so thats not a hazard.

If the genset is NOT configured as a Sepreately Derived Source, the 2 pole xfer swith is cheaper. Sure you can use a 3 pole and switch the Neutrals if the genset is configured as a Seperate Derived Source, but its more typical to use a 2 pole around here at least..

John T

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08-04-2013 18:19:15

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 Re: Transfer switches in reply to mazemeister, 08-04-2013 15:49:55  
If the generator has a bonded neutral, the transfer switch should switch the neutral as well as the live lines. If the generator has a floating neutral , the transfer switch should not switch the neutral and only switch the lines. Running neutral current on the ground system will shock livestock . Cause problems with communication equipment as land line phones, cable TV communications , alarm systems etc.

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