sub-panel disconnect

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derease

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I ran a sub-panel to a garage that is 25 feet from the main residence. It is a 100 amp sub-panel with 16 spaces. It is a lug panel with the main breaker in the residence at the main panel. my question is do I need a disconnect (main breaker) in the sub-panel? I already missed having a grounding rod for the sub and don't want to miss anything else. Any advise would be appreciated. Thanks Dave
 
How many breakers are being installed in the sub-panel ?
If more than 6, you need a main in the panel.
The sub panel must comply with 225.21 nad 225.36
 
To be more precise, there must be a way to disconnect all power from the garage, and it has to be local to the garage. The breaker in the house panel will not suffice. The easiest way to achieve this is to have a main breaker in the garage panel. But that is not the only way. A non-fused disconnect outside the garage is another option.
 
Dave, be careful if you use a MLO panel and install a main breaker then you will have to use a retainer clip for the main.

408.36(D) Back-Fed Devices. Plug-in-type overcurrent protection devices or plug-in type main lug assemblies that are backfed and used to terminate field-installed ungrounded supply conductors shall be secured in place by an additional fastener that requires other than a pull to release the device from the mounting means on the panel.
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There is a square d panel in the garage (lug panel). Can I just add a 100 amp breaker inside the panel to feel the bus bars?
 
You can. If you are using a branch breaker spot be sure to heed Dennis' advice on the retainer clip.
 
augie47 said:
How many breakers are being installed in the sub-panel ?
If more than 6, you need a main in the panel.
The sub panel must comply with 225.21 nad 225.36
Click to expand...

I many areas, if the panel has the capacity for more than six breakers a disconnect will be required. Any other words, if I only install 4 breakers in a 40-circuit panel, the AHJ in this area would require a disconnect. If I install a 6-circuit panel, they would accept it and no additional disconnect would be required.
 
haskindm said:
I many areas, if the panel has the capacity for more than six breakers a disconnect will be required. Any other words, if I only install 4 breakers in a 40-circuit panel, the AHJ in this area would require a disconnect. If I install a 6-circuit panel, they would accept it and no additional disconnect would be required.
Click to expand...

What do these inspectors do if you have to supply a load requiring 70 amps with a fusible disconnect?

Roger
 
To the wire, did you run 3 conductor with ground? If you did I believe there is no need for a ground rod.
 
Chev said:
To the wire, did you run 3 conductor with ground? If you did I believe there is no need for a ground rod.
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The GES is required, read 250.32 taking note of the first sentence of 250.32(A)


Roger
 
haskindm said:
I many areas, if the panel has the capacity for more than six breakers a disconnect will be required. Any other words, if I only install 4 breakers in a 40-circuit panel, the AHJ in this area would require a disconnect. If I install a 6-circuit panel, they would accept it and no additional disconnect would be required.
Click to expand...

So you install a six circuit panel or 12 circuit panel--- suppose I want 6 DP breakers as my disco. Here's the problem. I install 4 dp and have space left for 2 more DP or 4 sp---- then what do you do. :)
 
Dennis Alwon said:
I install 4 dp and have space left for 2 more DP or 4 sp---- then what do you do. :)
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Nothing; it's not my issue.

What, me worry?
newman.jpg
 
72gs455 said:
. . . im not understanding why i cant just run a 4-wire and no groundrod at the garage
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Because, unless the supply is a circuit (single or MWBC), the separate structure is required to hane an electrode system.

In a nutshell, a separate structure fed by a feeder is wired like a service as far as grounding is concerned, and like a sub-panel as far as bonding is concenred.
 
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