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Old 02-19-2010, 11:49 AM   #1
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New meter base and panel, wire size


I have read and searched a bunch on wire size and I wondered if you guys could confirm that #2/0 copper is fine to run from the meter base to the panel. Upgrading to 200 amp service, 200 amp base and 200 amp panel. From what I gather its ok for service wires at 200 amps, but in other applications its rated for less. For what its worth, the poco is running #4/0 to the the meter for the new service.

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Old 02-19-2010, 05:12 PM   #2
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Your good to go with 2/0 and a #6 bare ground/neutral. The POCO does what they want so don't worry about what size they are running.

You are right though, 2/0 is only good for 185A but the CEC allows us to use it for a 240/120 or 208/120 service that is 200A

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Old 02-19-2010, 06:30 PM   #3
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most likely the POCO is running 4/0 aluminum, not copper. That would be the proper size for 200 amp.

in our NEC, we have a section (table 310.15 B 6) that allows the wire to be undersized for a residential service. I am guessing you have something similar in the CEC.


Darren, you didn't really mean this did you?

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Your good to go with 2/0 and a #6 bare ground/neutral.
In the US a #6 would be good for a GEC to certain grounding electrodes but it is not a one size fits all in all situations and I do not believe you meant to infer the neutral can be a #6, or at least I hope. I suspect you were referring to the GEC. The neutral, unless you allow a reduced neutral, would have to be 2/0 cu just line the other service conductors.

at least in the US.
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Old 02-19-2010, 09:52 PM   #4
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Nap according to the CEC your allowed to use a reduced neutral. I know in Manitoba your allowed to do this but local jurisdiction may have different rules. I beleive Ontario requires you to have a full size neutral, not sure about BC.
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Old 02-19-2010, 09:58 PM   #5
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Thanks for the replies.
My research has shown that in BC they recently allowed reduced neutrals as well, something to do with the neutral only having to carry the unbalanced load between hots and not the entire thing.
Does anyone know if the main ground electrode to the water pipe has to be #4 bare copper or can that be #6 as well. I have read some conflicting info on this.
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Old 02-19-2010, 10:02 PM   #6
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My neutral from the meter to the panel is like 2' long
For the cost difference I'd never undersize it

In the US a #6 is Min for water ground
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Old 02-19-2010, 10:19 PM   #7
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Originally Posted by Scuba_Dave View Post
My neutral from the meter to the panel is like 2' long
For the cost difference I'd never undersize it

In the US a #6 is Min for water ground
A good point, mine is only going to be a few feet as well.
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Old 02-19-2010, 10:49 PM   #8
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for 200a service id run #4 for a ground,#6 is ok for 100a service around here anyway.
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Old 02-19-2010, 10:53 PM   #9
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Yeah...I use #4 to the water pipes & for the ground rods
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Old 02-19-2010, 11:39 PM   #10
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Quote:
Originally Posted by darren View Post
Nap according to the CEC your allowed to use a reduced neutral. I know in Manitoba your allowed to do this but local jurisdiction may have different rules. I beleive Ontario requires you to have a full size neutral, not sure about BC.
but not a #6 though, right?
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Old 02-19-2010, 11:42 PM   #11
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Quote:
Originally Posted by Scuba_Dave View Post
My neutral from the meter to the panel is like 2' long
For the cost difference I'd never undersize it

In the US a #6 is Min
NO NO NO.

the neutral is not a #6 unless you have like a 40 amp service. Actually, there is no service legal that would alllow a #6 NEUTRAL.

the GEC to the ground rods, if only going to the ground rods, is a #6 minimum.

to other electrodes, I would need to check, they vary based on the service size
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Old 02-19-2010, 11:50 PM   #12
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you need no larger than a #6 cu or #4 al to the water pipe if we are speaking of the GEC. A bonding jumper is based on the service conductor size.
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Old 02-20-2010, 12:07 AM   #13
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for ground to street side of water service i always use a continuous #6 on 100a service,on a 200a i use #4 am i missing something here?cant see it very well in this picture but thats a #6 ground on right side of buss
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Old 02-20-2010, 12:16 AM   #14
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New meter base and panel, wire size


Ok, here is the info I have on the reduced neutral. It actually does state that for 200amp service its ok to use #6 copper for the neutral wire. It says that this was adopted with the 20th edition of the CEC and adopted without amendments by the BC Safety Authority. I'd love some feedback on this for sure.
I will probably just use the larger neutral since mine is such a short run, but the reasoning stated is interesting.
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File Type: pdf Reduced Neutral page 1.pdf (99.6 KB, 208 views)
File Type: pdf Reduced Neutral page 2.pdf (93.0 KB, 111 views)
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Old 02-20-2010, 12:20 AM   #15
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New meter base and panel, wire size


#6 ground is what you need, it was #3 but they changed that a few code books ago.

Nap if i was doing my service I would run two 2/0 and a bare #6 from my panel to the meter and then from the meter up to the service head and the inspector would have no problem with it.

To go with the larger neutral is up to you but is a waste, copper is not cheap and it will be alot cheaper to go to the #6. Obviously it is safe or they would not approve it.

Are you doing this yourself or are you hireing someone to do it.


Last edited by darren; 02-20-2010 at 12:26 AM.
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