Generator Interlock

[Anthony1971]

Hi my name is Anthony I am an Electrician in Massachusetts .I am mostly An Industrial Electrician so I’m not familiar with the residential codes . I’m upgrading my service to 200 amp and I have a question about the generator interlock. I know by putting the meter main outside is your first point of disconnect and your neutrals and grounds are bonded in there then they are seperated in the inside panel which is now the subpanel My question is I have a main breaker in the sub panel and I like to put it in there and should the neutral be bonded in the genarator because they are seprtate in the sub panel it’s a portable generator. .

 

[augie47]

Are you using a breaker interlock for switching ?
If you are not switching the neutral from the generator it is not a SDS and the neutral must not be bonded at the generator.

 

[Anthony1971]

Yes I was going to put a interlock switch to interlock the 2pole 30amp breaker with the 200 amp breaker in the sub panel after the meter main where the the grounds and neutrals are separated

 

[Anthony1971]

And I I’m not switching the neutral

 

[infinity]

Yes I was going to put a interlock switch to interlock the 2pole 30amp breaker with the 200 amp breaker in the sub panel after the meter main where the the grounds and neutrals are separated

So you will need an inlet, 2 pole 30, interlock kit and signs. Don't forget to check Article 702 for the required signage.

 

[Dennis Alwon]

So you will have a meter---Transfer Switch with Main that feeds a main breaker sub panel. From the sub you will have a 4 wire inlet so your neutrals and grounds are separated.

 

[Anthony1971]

So you will have a meter---Transfer Switch with Main that feeds a main breaker sub panel. From the sub you will have a 4 wire inlet so your neutrals and grounds are separated.

View attachment 2571713

Here’s the interlock I got for the sub panel to lock out the 200amp breaker and 30 amp breaker

 

[Anthony1971]

Here’s the one line of everything that I have

 

[Dennis Alwon]

So you will have a meter---Transfer Switch with Main that feeds a main breaker sub panel. From the sub you will have a 4 wire inlet so your neutrals and grounds are separated.

View attachment 2571713

Sorry I didn't mean Transfer Switch but rather a meter / main panel to the sub. I think you have the right idea. The interlock must be designed for whatever panel you have at the house. geninterlock.com has all the different interlocks for many different panels.

 

[Anthony1971]

Sorry I didn't mean Transfer Switch but rather a meter / main panel to the sub. I think you have the right idea. The interlock must be designed for whatever panel you have at the house. geninterlock.com has all the different interlocks for many different is it

 

[Anthony1971]

Is it ok to have the neutral bonded in generator cause the grounds and neutrals are separated in the sub panel

 

[Little Bill]

Is it ok to have the neutral bonded in generator cause the grounds and neutrals are separated in the sub panel

You should unbond the generator as you are not switching the neutral.

 

[Anthony1971]

You should unbond the generator as you are not switching the neutral.

Ok I’ll unbond the generator other than that does my one line look ok any is there any other adjustments I need to make

 

[Anthony1971]

Here’s the one line

 

[Dennis Alwon]

Here’s the one line

I thought I answered you.... everything looks good

 

[Anthony1971]

Thanks for your info

 

[Anthony1971]

Is there a specific height for the generator inlet box

 

[qcroanoke]

Is there a specific height for the generator inlet box

No code required height but I put mine high enough that I would be able to see how to line it up to plug it in.
Usually if your power is out the weather sucks too and you want to be able to plug it in quickly.