Ge 200 Amp Main Breaker Outdoor Feed Through Panel
iwire
Moderator
Staff member
- #2
Re: feed-through to subpanel?
The only way to do this would be to use a conductor rated for 200 amps.
That is unless the distance is under 25 feet, then you could use the tap rules.
- #3
Re: feed-through to subpanel?
Psoderlund, could you please explain the proposed installation a little further ? Will the sub-panel be located adjacent to the main breaker panel or will it be remote from that location ?
Bob, after Psoderlund's reply could you please explain your response further also?
It is my understanding that if the sub-panel is added adjacent to the main breaker 200 amp panel and tapped off using feed-through lugs then it is not a sub-panel but part of the service equipment and the first part of Bob's answer is correct. If you decide to locate the new panel in a remote section of the basement you cannot run those service conductors "unfused" to that location. If you install a 150 amp main breaker in its own enclosure adjacent to the 200 amp main breaker panel you can then install a 150 amp main lug panel anywhere you want to.
Am I incorrect about this or not invisioning the installation correctly ?
Regards,
Phil
iwire
Moderator
Staff member
- #5
Re: feed-through to subpanel?
Hi Phil, I made an assumption that the 200 amp service panel has a main breaker protecting it.
If that is the case there will be 200 amps available at the lugs he is coming off necessitating the use of 200 amp wire for the 50' foot run to the 150 amp panel.
If it was less than 25', going from memory he could use the 25' tap rule and use 150 amp wire between the 200 amp panel and the 150 main in the sub panel. 
- #8
Re: feed-through to subpanel?
240.21 is the tap rule.
408.16 is overcurrent protection article for panel boards.
[ February 19, 2004, 06:45 PM: Message edited by: russ ]
- #9
Re: feed-through to subpanel?
If that is the case there will be 200 amps available at the lugs he is coming off necessitating the use of 200 amp wire for the 50' foot run to the 150 amp panel.
If it was less than 25', going from memory he could use the 25' tap rule and use 150 amp wire between the 200 amp panel and the 150 main in the sub panel.
Bob,
Are you certain the tap rules apply here ? It sounds like Peter is probably going to run about 50' of SER cable from the feed-thru lugs ahead of the 200 amp main breaker (unfused) to a remote sub-panel. I still think he needs a 150 amp main breaker adjacent to the 200 amp main breaker panel.
Peter,
I went through this recently (it happened to be a Square D - QO panel) and I don't believe you can convert a (factory installed) main breaker panel to a main lug panel without voiding the UL listing
Tonyi,
From Peter's description it doesn't sound like the sub-panel will be protected by the 200 amp main breaker. If he's tapping off the feed thru lugs before the main breaker that 50' run is unprotected (the way I see it).
I think this is the best scenario.
- #11
Re: feed-through to subpanel?
Tonyi & Bob,
Maybe it's me and I'm not familiar with the same feed-thru lugs you're talking about. What I'm familiar with are feed-thru lugs that are on top of a main breaker that allow you to feed-thru to another main breaker panel in close proximity. If there are kits that tap onto the buss-bar after the 200 amp main breaker then maybe both of you are correct and I'm offering some incorrect advice. If there are any photos or maybe a link available for those devices could you post them here so we can all benefit from them.
Thanks,
Phil
- #12
Re: feed-through to subpanel?
Goldstar: Square D makes subfeed lugs that attach to the line side of a MLO bus, and they make feed-thru lugs that attach to the other end of the bus. See:
Square D PN107
Does GE make a 100A stab-in breaker? Your customer may want to consider if a 100A panel in the basement would be sufficent. Then you add a 100A breaker in the existing panel and run 100A wire to a 100A MLO panel in the basement. This would be much cheaper than running 200A wire to a 150A MCB panel.
Steve
iwire
Moderator
Staff member
- #14
Re: feed-through to subpanel?
Peter
Two options that I can think of if you need the 150 amps.
1)Use the feed through lugs you spoke of and feed a 200 amp fused switch at the panel with 150 amp wire using the tap rules put in 150 amp fuses and run 150 amp conductors to a 150 amp MLO subpanel.
2)Use the feed through lugs and run 200 amp conductors to a 200 amp MLO subpanel.
If you are stuck using 200 amp conductors I do not see much savings in a 150 amp panel.
Phil I am not sure what you are asking about the tap rule I was thinking of, if you are more specific I will be happy to answer.
Bob
- #18
Re: feed-through to subpanel?
ccha9219 And horizon
You can not use a breaker from another manufacture unless it is a UL clasifide type breaker and is UL listed for that panel.
Cuttler Hammer does make a few, But they must have the panel in there list of panels it can be installed into.
This is against NEC artical 110.3(B)
- #19
Re: feed-through to subpanel?
Psoderlund
Does the planned load require a 150amp subpanel? If so have you done a load calculation on the existing residence and come out with 50 amps or less?
iwire
Moderator
Staff member
- #20
Re: feed-through to subpanel?
Stars that is a good question.
I think we can assume if the total load was calculated it would exceed 200 amps.
Would it really exceed 200 amps?
Source: https://forums.mikeholt.com/threads/feed-through-to-subpanel.7622/
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