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New Breaker

Merry Christmas
A

Alwayslearningelec

Senior Member
Location
NJ
Occupation
Estimator
Replacing 200A breaker with new 300A breaker. Could there be issue with it psychically fitting in the board/frame size?

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electrofelon

electrofelon

Senior Member
Location
Cherry Valley NY, Seattle, WA
Not sure what that is. My first thought it's an FD which is a 250 amp frame,but I actually have one sitting right here it doesn't look quite like it. If you're lucky it's a JD frame which is 400 amp, but it doesn't look like that either. Not sure what else it could be.
 
J

jim dungar

Moderator
Staff member
Location
Wisconsin
Occupation
PE (Retired) - Power Systems
Alwayslearningelec said:
So how could anyone even accuratley price the replacment of this?
Click to expand...
You need to know the model number of the existing breaker or if there is existing space for a 400A frame. This is what RFI's are for. Get a readable picture of the entire existing switchboard, or a copy of the original switchboard drawings.

I have seen many contractors be surprised once they saw they needed to relocate existing breakers to make space for the new ones.
 
M

MyCleveland

Senior Member
Location
Cleveland, Ohio
Alwayslearningelec said:
So how could anyone even accuratley price the replacment of this?
Click to expand...
If this is a plan/spec job…the author of the plans is responsible to work through this.
It is NOT your job to resolve this nor is it ALL the other bidders.
What happens if for what ever reason a 400 amp cannot be added, are you on the hook for suppling a new section.

Send an RFI to the GC informing him the plans are incomplete.
You do need to develop contacts for each gear manufacturer so when these type of issues come up you have someone to reach out to for solid answers.
 
Knightryder12

Knightryder12

Senior Member
Location
Clearwater, FL - USA
Occupation
Sr. Electrical Designer/Project Manager
MyCleveland said:
If this is a plan/spec job…the author of the plans is responsible to work through this.
It is NOT your job to resolve this nor is it ALL the other bidders.
What happens if for what ever reason a 400 amp cannot be added, are you on the hook for suppling a new section.

Send an RFI to the GC informing him the plans are incomplete.
You do need to develop contacts for each gear manufacturer so when these type of issues come up you have someone to reach out to for solid answers.
Click to expand...
I agree with your statement to a point. As design professionals, we do not always have the ability or the accessibility to find this information out as some places have underwriters insurance that will not allow us (designers) to open up panelboards or switchboards. But, knowing that, we should have the owner set up a time when their electrical contractor, or an electrical contractor to be there so they can pull the covers and gather said information. But again, we do not this information going in a lot of the times.
 
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