Will this electric panel work?

[naturalgas]

I have a 200 amp service in house and will run 100 amp to detached garage. The electrician is coming in morning to get started ,and he told me to pick up a 100 amp Murray sub panel with preferred 24 spaces. All they had was 20 space so I picked up this panel with main breaker and 30 spaces which is even better I'm thinking. Am I ok with this? Does it matter if I have a 100 amp breaker from house to this panel in garage with a main breaker? I am thinking it is just overkill which is ok with me for the extra spaces for breakers or is there another reason not to use a main breaker in garage. This is pic of what I picked up. Thanks in advance. Jim

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[rockwithjason]

it will work

 

[naturalgas]

Thank you


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[PaulyC]

that panel will work fine. code requires anything with more than 6 separate breakers to have a main disconnect so you need a panel with a main in it.

 

[rockwithjason]

that is for main equipment, this is a sub feed.

 

[naturalgas]

Even better!


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[naturalgas]

Yes sub feed. As long as this panel will work. For the twenty bucks more it's worth it for the extra spaces. Thanks guys


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[PaulyC]

that is for main equipment, this is a sub feed.

still needs a main disco. around here if its a separate building it needs a main. i know what 225.31 says but if its a detached garage they want a disco in the panel or at least somewhere in the same buillding

 

[wyliesdiesels]

that is for main equipment, this is a sub feed.

It is also for subpanels.

If theres gonna be more than 6 breaker handles then he will need a main diwconnect.

Yes sub feed. As long as this panel will work. For the twenty bucks more it's worth it for the extra spaces. Thanks guys


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Looks like that panel will be fine. It even includes a ground bar, though u may want 2.

And make sure to run 4-wire feeder and unbond the neutral bar. U will also need 2 grounding electrodes.

 

[klassenl]

And make sure to run 4-wire feeder and unbond the neutral bar. U will also need 2 grounding electrodes.

I have seen this suggested here before. If you run 4 conductors (A phase, B phase, Neutral and Bond/ground) why would you still need ground rods?

 

[wyliesdiesels]

I have seen this suggested here before. If you run 4 conductors (A phase, B phase, Neutral and Bond/ground) why would you still need ground rods?

Its not a suggestion. Its REQUIRED for new installs.

EGCs and ground rods are 2 different animals with different functions and both are required.

Ground rods are primarily for lightning suppression.

EGCs provide a low resistance path for fault current so breakers can clear faults.

Dont confuse the 2.

Heres a great article that will help u understand the differences:

http://www.electriciantalk.com/articles/the-confusion-of-the-term-grounding/

 

[Speedy Petey]

I have seen this suggested here before. If you run 4 conductors (A phase, B phase, Neutral and Bond/ground) why would you still need ground rods?

Because ground rods, and the earth/dirt outside have NOTHING to do with the equipment ground run with the feeder or circuit conductors. They serve two very different purposes as Wylie explained.

 

[klassenl]

So where do you run the wire that's connected to the ground rods?

 

[wyliesdiesels]

So where do you run the wire that's connected to the ground rods?

Depends-

In a 4-wire subpanel, it goes to the ground bar. The neutral bar should be unbonded/isolated.

In a 3-wire subpanel, it goes to the BONDED neutral bar.

And in the main service panel, it goes the BONDED neutral bar.

Why do u ask?

That wire BTW is called the GEC- grounding electrode conductor NOT a ground wire.

 

[klassenl]

In the Canadian code there are very few instances where 2 grounding electrodes are allowed in the same system. For instance, if you are running a sub panel in a garage with a 4 conductor cable (2 phases, a neutral and a bond) you are not allowed within the code to put ground rods in at the garage, even considering the neutral and ground are not bonded in the sub panel.

However, if you use a cable that only has 3 conductors (2 phases and a neutral) then you are required by code to put in an electrode (plate or rods).

It is just the differences in the way things are done in different jurisdictions. I personally have worked in 3 different precincts in Canada and all 3 have different rules based on the same code book (natural gas work has the same problems, maybe even worse).

 

[nadogail]

It is just the differences in the way things are done in different jurisdictions. I personally have worked in 3 different precincts in Canada and all 3 have different rules based on the same code book (natural gas work has the same problems, maybe even worse).

As you have very clearly stated, what is the requirement in one jurisdiction maybe prohibited in another.

For this reason, I respectfully decline to comment on local decisions by the Athority Having Local Juristiction.

 

[Norcal]

As you have very clearly stated, what is the requirement in one jurisdiction maybe prohibited in another.

For this reason, I respectfully decline to comment on local decisions by the Athority Having Local Juristiction.

And the inspector is not the AHJ, they are the representative of the AHJ.