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#206602 - 07/19/12 07:14 PM generator install
schenimann Offline
Member
Registered: 02/18/08
Posts: 193
Loc: Western North Carolina
I am pricing a 20ke gen install. The house has a panel back to back with the meter base. When I bring my 4 wire to the panel that currently has 3 wires do I need to separate the grounds an neutrals?
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#206606 - 07/19/12 07:45 PM Re: generator install [Re: schenimann]
gfretwell Offline


Member
Registered: 07/20/04
Posts: 9036
Loc: Estero,Fl,usa
What kind of transfer equipment are you using? Do you switch the neutral?

The objective is to have one and only one bonding jumper at any time.
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Greg Fretwell
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#206609 - 07/19/12 08:03 PM Re: generator install [Re: schenimann]
schenimann Offline
Member
Registered: 02/18/08
Posts: 193
Loc: Western North Carolina
The HO purchased a kholer gen and a transfer switch from HD. I don't think the neutral will switch.
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#206611 - 07/19/12 09:30 PM Re: generator install [Re: schenimann]
gfretwell Offline


Member
Registered: 07/20/04
Posts: 9036
Loc: Estero,Fl,usa
If you do not switch the neutral, your service bonding jumper is the jumper you use so you want to isolate the neutral at the generator. This is not a separately derived system. You still bond the EGC of the generator to the grounding system at the house.
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Greg Fretwell
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#206612 - 07/19/12 09:46 PM Re: generator install [Re: schenimann]
schenimann Offline
Member
Registered: 02/18/08
Posts: 193
Loc: Western North Carolina
I will install a disconnect before the switch. At that disconnect I will isolate the neutral from there. From the switch to the panel I will have them isolated. However, they are not currently isolated in the panel. I will need to separate them in the panel, correct.
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#206614 - 07/20/12 10:19 AM Re: generator install [Re: schenimann]
gfretwell Offline


Member
Registered: 07/20/04
Posts: 9036
Loc: Estero,Fl,usa
If you isolate the neutral in the panel, where is the main bonding jumper?
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Greg Fretwell
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#206616 - 07/20/12 06:33 PM Re: generator install [Re: schenimann]
wire_twister Offline
Member
Registered: 07/25/07
Posts: 265
Loc: Georgia USA
The Kohler switches I have installed have an isolated neutral buss with enough space for a neutral from the disconect, the load, and the genset, making the main bonding jumper in the meter pan the only one, weather you are on utility or generator power.
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Jimmy

Life is tough, Life is tougher when you are stupid
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#206617 - 07/20/12 08:02 PM Re: generator install [Re: schenimann]
gfretwell Offline


Member
Registered: 07/20/04
Posts: 9036
Loc: Estero,Fl,usa
Exactly right Jimmy. The thing is you only have one bonding jumper. It is there in any configuration but only one at a time. If you switch the neutral, the bonding jumper moves with it.

Soares has some great pictures, at least they did have on my ancient copy.

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Greg Fretwell
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#206636 - 07/26/12 05:33 AM Re: generator install [Re: schenimann]
shortcircuit Offline
Member
Registered: 06/27/04
Posts: 608
Loc: massachusetts
If your doing a whole house transfer, Kohler has a Service Entrace rated transfer switch and the neutral bond will be made there. You need to seperate all neutral and grounds at the exisisting main panel because it is now downstream from the main disconnect. (remove the bond screw also)

You will also have to relocate your grounding electrode conductor from the existing panel to the new service entrance rated transfer switch.

shortcircuit
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#206644 - 07/27/12 03:10 PM Re: generator install [Re: schenimann]
schenimann Offline
Member
Registered: 02/18/08
Posts: 193
Loc: Western North Carolina
The HO purchased the package from Lowes that comes with the standard transfer switch and not the service entrace switch. Therefore I will need to put in a 200amp disconnect before the switch. The bond will be made in the disconnect and everything else will be seperated downstream.

I worded it wrong in my previous post. When I said separate my grounds and neutral at the disconnect I meant they would be bonded there and go out separate after that to the switch and panel.
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