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Generator change over switch

Rc3

Hi all I have a job coming up soon, which includes the install of a generator change over switch, just in relation to the main neutral from the ESB side is it a case of redirecting this though change over switch, and my main neutral from generator does this need to be earthed at generator?

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[Deleted User]

2011 wrote: »

Can you reword?

High current loads on largest supply source.

Mission critical loads on both.

[Deleted User]

Shared neutrals...One less thing to go wrong, I didn't sign off the installation how do I know there won't be a problem.
Edit; [If the neutrals are separated I can run parallel isolated]..ie...morah powah!!! MwahaHAha....ah..ahem..

Usually shore power loads exceed inverter loads.
Or I don't want the missus running the immersion off my stand-by battery set.

Electrode & neutralise the genset, continuous PE to ESB also, via terra firma and distribution.

2011

Sir Liamalot wrote: »

I would not share neutrals.

Interesting, why?

I would reconstruct the distribution as utility only circuits and maintained circuits.

Not really sure what you mean

Can you reword?

Three position, Centre off, changeover rotary cam switch. Kraus and Naimer make the best, not expensive, by standards.
Or an automatic changeover with a 1ms delay timer.

Nothing wrong with a 3 position changeover switch:
Position 1) ESB supply connected to load
Position 2) OFF - Load disconnected from both supplies
Position 3) Generator supply connected to load

But why complicate by switching the neutral too?

The installation will only have one neutralising point, at a time, when set up like this. One for utility and one for back-up.

Understood, but what is the advantage of this set up?
I have never seen it done this way.

[Deleted User]

I would not share neutrals.

I would reconstruct the distribution as utility only circuits and maintained circuits.

Three position, Centre off, changeover rotary cam switch. Kraus and Naimer make the best, not expensive, by standards.
Or an automatic changeover with a 1ms delay timer.

The installation will only have one neutralising point, at a time, when set up like this. One for utility and one for back-up.

Steve

I've done lots of commercial auto gen sets over the years, all TNC, all rely on ESB earthing.

2011

Rc3 wrote: »

Hi all I have a job coming up soon, which includes the install of a generator change over switch, just in relation to the main neutral from the ESB side is it a case of redirecting this though change over switch, and my main neutral from generator does this need to be earthed at generator?

A few more details would help.
Domestic single phase installation? Manual changeover?

I would:
1) Have the ESB supply neutral and the generator neutral sharing the same neutral bar.
2)Neither neutral would be switched.
3)Normally the entire installation would only be neutralized at one point.

gctest50

Just isolate your generator completey from the mains

Crowbar it

Backfeeds kill people