Almost done with electrical. Little more help!

[Astross89]

Past thread
https://www.garagejournal.com/forum/showthread.php?t=394032

Detached will have 2 grounds in the ground.

New question.

1) does the neutral of 100amp sub box (90amp breaker) on the out side of my house connecting the ser cable from my meter box running through the attic to the mhf wire to the detached garage need to be bonded to the ground?

2) does the new 100amp detached garage main panel neutral need to be bonded to the ground?

3) I'm running a 50 amp sub panel from my detached garage to the opposite corner of the garage. I will run 1 30amp 220v and 1 20 amp 220v. Plus two more slots for the future.

A- does it need bonding
B- I ran 6-2 copper from the main panel to that box. Is that fine? Or was I supposed to run a 6-3? I hope not.


Hope I described it correctly.

 

[Norcal]

The neutral is not bonded to the grounding electrode in a detached structure, for strictly 240 volt loads, the 6/2 is fine but changes that may happen in the future may cause you to regret not using 6/3.

 

[CNGsaves]

OP . . . . also be helpful to Sparky's trying to help you by filling out GJ Profile with a LOCATION . . . . . at least state/country. Sometimes Canada vs USA have some differences.

Search similar threads on GJ as there is very nice schematic that shows all those proper connections for detached garage (ie subpanel). GJ Sparky's answer this question quite often. Good luck and post up some pics of the finished product.

 

[Astross89]

Location is Brevard, FL

 

[bczygan]

https://www.garagejournal.com/forum/showpost.php?p=6410408&postcount=3

Bill

 

[bczygan]

The neutral is not bonded to the grounding electrode in a detached structure, for strictly 240 volt loads, the 6/2 is fine but changes that may happen in the future may cause you to regret not using 6/3.

Isn't 4 wire required?

Bill

 

[Astross89]

Isn't 4 wire required?

Bill

The hundred amp panel to the detached garage will be fed mhf 4 wire (2-2-2-4). But yes that's what I'm trying to figure out is the 6 slot sub panel inside the same detached garage. Do I need for wire or can I get away with three (6/2). for thesub panel inside the same detached garage I plan on running two 220 circuits and maybe a 120 later.

 

[sberry]

It needs 3 conductor for 120v.

 

[bczygan]

It needs 3 conductor for 120v.

Then he needs 4?

Bill

 

[Astross89]

Sorry for the confusion. I just went to my garage and took a look at the breakers that I bought. The sub panel is going to be a dedicated 220v. NO 120v on the 6-slot subpanel. 220v only fed by a 50amp double pole breaker with 6-2 copper from the detached garage panel.

6-2 should be fine then? I swear I'm not as dumb as I sound. LOL just trying to make sure everything is done correctly


Like this?

 

[Astross89]

Disregard this post

 

[Norcal]

Isn't 4 wire required?

Bill

Not if it's strictly 240V.

 

[Astross89]

Not if it's strictly 240V.

This is what I'm hoping. Not my first choice. But the wire is already ran and behind the wall. So if I can run it strictly 240. Then it's not a total waste. I just need to be correct that the wiring diagram in post 10 is what I need to do.

 

[wyliesdiesels]

Since the original wiring idea has changed i will just respond in a general way.

For NEW wiring, the neutral should be bonded ONLY at the main service panel and NOWHERE else...

This means any NEW subpanels would have an isolated neutral bar and will need a separate ground bar....

Hopefully that answers your questions.

Go checkout the electrical FAQ sticky for more detailed info on this subject...