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Joined: Jul 2002
Posts: 8,443
Likes: 3
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Kiwi,
We are probably quite lucky down here as far as inter-connecting generators is concerned.
We don't have the problem where if the power goes out in the winter, people just blindly back-feed thier switch-boards, like has occured a time or two in the US.
One question though, is it acceptable to have a seperately derived generator feed into a small part of a house, where that part of the house is fed through a transfer switch?.
I'm talking the generator feeds that section, through an appliance inlet, PDL IP56 job, and the genny is mounted on a concrete pad, with a cage over it, to prevent un-authorised starting of the said generator.
A local guy here wants to be able to keep his 3 freezers going in the event of loss of supply, he keeps deer velvet in them.
Any drop in temperature would ruin the velvet.
He want's to know if this is feasable?.
What I want to know is if I need to drive an earth stake and/or bond the Neutral at the genny frame.
Losing a freezer load of velvet is like losing NZ$100,000, if not more in one shot, it will only tolerate a temperature rise of 5C from -15C, once frozen.
Any ideas??.

Joined: Dec 2004
Posts: 354
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kiwi Offline OP
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Trumpy, a transfer switch should never let the supply be connected to the auxilliary supply.

In N.Z. I don't think its possible to connect a generator to the grid without a transfer switch unless a suicide lead is used.

Not to say that it doesn't happen though !

Joined: Jul 2002
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Kiwi,
Quote
a transfer switch should never let the supply be connected to the auxilliary supply.
Granted mate.
Instead of a transfer switch, I was thinking a pair of contactors, mains failure opens the main circuit to the freezers, closes the secondary supply (12V coil), also having an alarm contact that closes, to alert the owner to start the generator, fed from a 12V SLA cell, kept charged from the usual 230V supply?.

Joined: Dec 2004
Posts: 354
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kiwi Offline OP
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Trumpy, I think a pair of contactors does constitute a transfer switch.

Motorised circuit breakers are a more reliable method though as the contactors require a constantly energised coil which can fail unexpectedly.

Joined: Dec 2005
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The generators we use have motorised circuitbreakers.


The product of rotation, excitation and flux produces electricty.
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