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Topic Title: 230v2kva generators.
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Created On: 15 April 2014 08:32 PM
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 15 April 2014 08:32 PM
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hertzal123

Posts: 296
Joined: 26 August 2007

A friend rang me regarding using his generator for certain essential loads like lighting and c heating at home.Think its a honda in the suitcase style body.Are these machines normally centre tapped to earth,which would preclude an earth spike on the neutral side?Thought I could feed 2 commando sockets and trailing plugs from the cu so the circuits could be fed from the cu or a seperate rcd unit with sockets fed from the generator,without the need for a c/o switch.
Thanx for any advice.Hz.
 15 April 2014 10:39 PM
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Fm

Posts: 650
Joined: 24 August 2011

Tlc do a nice 100 amp changeover switch. Ideal for this situation.
 15 April 2014 10:48 PM
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hertzal123

Posts: 296
Joined: 26 August 2007

Originally posted by: Fm

Tlc do a nice 100 amp changeover switch. Ideal for this situation.


Would I not need the seal fairy to call overnight to attend to the cutout,
if dealing with the tails?
Regards,Hz.
 16 April 2014 09:36 AM
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AJJewsbury

Posts: 11299
Joined: 13 August 2003

Are these machines normally centre tapped to earth,which would preclude an earth spike on the neutral side?

You'd need to check, but many small machines are floating - i.e. the PE contact connects to the generator's chassis, but there's no connection to the winding (or electronic equivalent if its stabilised) . That's so they can supply a single appliance (or small group of appliances) as a separated system - so safety can be guaranteed under single fault conditions without relying on an RCD (which might not be reliable given the vibration & other hostile conditions portable generators are often subject to).

We wary of just putting a high impedance voltmeter between L/N and PE to try and work out if there's a CT link - capacitive coupling could well suggest that PE is mid-way between L and "N" even when there's no metallic link. Old fashioned test lamps might be more reliable in this case.

- Andy.
 16 April 2014 07:23 PM
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hertzal123

Posts: 296
Joined: 26 August 2007

Thanx for the help.
Hz.
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