100 Amp Panel Breaker Capacity
- Thread starter pgrwd
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electricmanscott
Senior Member
- Location
- Boston, MA
Re: 100 Amp Panel Breaker Capacity
Another useless inspector?
[ May 13, 2004, 06:14 PM: Message edited by: electricmanscott ]
Another useless inspector?
[ May 13, 2004, 06:14 PM: Message edited by: electricmanscott ]
bphgravity
Senior Member
- Location
- Florida
Re: 100 Amp Panel Breaker Capacity
Could the inspector be remarking on one particular panel that specifies a maximum of 12 overcurrent devices by the manufacturer and not a general statement of all 100-ampere panelboards?
Could the inspector be remarking on one particular panel that specifies a maximum of 12 overcurrent devices by the manufacturer and not a general statement of all 100-ampere panelboards?
ryan_618
Senior Member
- Location
- Salt Lake City, Utah
Re: 100 Amp Panel Breaker Capacity
hey...I resemble that comment
bphgravity
Senior Member
- Location
- Florida
Re: 100 Amp Panel Breaker Capacity
As many that are permitted by the design and specifications of the panelboard. Not all panelboards allow the use of tandem breakers.
abode electric
Member
- Location
- New jersey
Re: 100 Amp Panel Breaker Capacity
ITE and Cutler Hammer make 100amp panels with 30 full spaces.
ITE and Cutler Hammer make 100amp panels with 30 full spaces.
electricmanscott
Senior Member
- Location
- Boston, MA
Re: 100 Amp Panel Breaker Capacity
[/QUOTE]Present company excluded of course.
[ May 13, 2004, 07:34 PM: Message edited by: electricmanscott ]
hey...I resemble that comment
[/QUOTE]Present company excluded of course. [ May 13, 2004, 07:34 PM: Message edited by: electricmanscott ]
A
a.wayne3@verizon.net
Guest
Re: 100 Amp Panel Breaker Capacity
UL listings take charge,A 40/40 no tandems allowed a 40/42 limits you as per NEC to 42 circuits
UL listings take charge,A 40/40 no tandems allowed a 40/42 limits you as per NEC to 42 circuits
bphgravity
Senior Member
- Location
- Florida
Re: 100 Amp Panel Breaker Capacity
Panelboard manufacturers are required to make class CTL current limiting panelboards to not exceed 42 devices, breaker manufacturerers are not.
Look at the slots on the panelboard busbars. A panelboard that allows tandems will have a different configuration at the locations the tandems are permited. A compliant tandem breaker will not fit into a slot not permited for tandems, however their are non-compliant breakers on the market that will fit in a non-tandem spot.
Panelboard manufacturers are required to make class CTL current limiting panelboards to not exceed 42 devices, breaker manufacturerers are not.
william runkle
Senior Member
- Location
- Michigan
Re: 100 Amp Panel Breaker Capacity
This might be the reason the inspector said 12 spaces for a 100 amp panel, possible the panel in questioned is 12 spaced and listed not to have more than 12 breakers single poles.
This might be the reason the inspector said 12 spaces for a 100 amp panel, possible the panel in questioned is 12 spaced and listed not to have more than 12 breakers single poles.
A
a.wayne3@verizon.net
Guest
Re: 100 Amp Panel Breaker Capacity
Look at a panel buss bars, homeline for example,They make a 40/40 and a 40/42 panel.
The 40/42 has step buss bars and the 40/40 is squared off.Hense the tandems won`t fit unless you remove the metal tab on the tandem breaker
and that would be a violation.
Look at a panel buss bars, homeline for example,They make a 40/40 and a 40/42 panel.
The 40/42 has step buss bars and the 40/40 is squared off.Hense the tandems won`t fit unless you remove the metal tab on the tandem breaker
and that would be a violation.
goldstar
Senior Member
- Location
- New Jersey
- Occupation
- Electrical Contractor
Re: 100 Amp Panel Breaker Capacity
Sq D also makes a 200 amp main breaker, 30 slot - 40 circuit panel which they consider a "remodel" breaker panel. If you look at the buss bar, the bottom five breaker positions on each side are stepped (as awayne mentioned) making it acceptable to install tandem breakers in those positions and giving you the possibility for 40 s/p circuits. In addition, if you look at the breaker directory on the panel cover it displays the top 30 breaker positions with plain white rectangular slots in which to write in an identification. The bottom 10 slots have a dashed line through the center of the rectangular box for an "a" and "b" identification.
In a recent kitchen remodel job I added a wall oven and 2 counter receptacle circuits. The homeowner had an older 100 amp Sq D QO panel with several tandem breakers already installed. There was enough room to install the breakers I needed to but when the inspector looked at the panel he red tagged it and required me to either prove that the panel was designed to accept tandem breakers or install a sub-panel (his tip-off was the directory on the panel door). I installed the sub-panel even though the original panel (mechanically) accepted the tandem breakers. So not all buss bars are stepped.
Awayne, be careful what you post here. Not all of us on the list are licensed electricians whose livelihood depends on "doing things right" and "doing right things".
Regards,
Phil
[ May 14, 2004, 06:22 AM: Message edited by: goldstar ]
In general, most of the main breaker panels sold have configurations of 20 circuit/100 amp, 30 circuit/150 amp and 40 circuit/200 amp. (I believe the 100 amp panels are available in smaller configurations). If you are using panelboards (bolt-in breakers) they are available in up to 42 circuits.
Sq D also makes a 200 amp main breaker, 30 slot - 40 circuit panel which they consider a "remodel" breaker panel. If you look at the buss bar, the bottom five breaker positions on each side are stepped (as awayne mentioned) making it acceptable to install tandem breakers in those positions and giving you the possibility for 40 s/p circuits. In addition, if you look at the breaker directory on the panel cover it displays the top 30 breaker positions with plain white rectangular slots in which to write in an identification. The bottom 10 slots have a dashed line through the center of the rectangular box for an "a" and "b" identification.
In a recent kitchen remodel job I added a wall oven and 2 counter receptacle circuits. The homeowner had an older 100 amp Sq D QO panel with several tandem breakers already installed. There was enough room to install the breakers I needed to but when the inspector looked at the panel he red tagged it and required me to either prove that the panel was designed to accept tandem breakers or install a sub-panel (his tip-off was the directory on the panel door). I installed the sub-panel even though the original panel (mechanically) accepted the tandem breakers. So not all buss bars are stepped.
Awayne, be careful what you post here. Not all of us on the list are licensed electricians whose livelihood depends on "doing things right" and "doing right things".Regards,
Phil
[ May 14, 2004, 06:22 AM: Message edited by: goldstar ]
Re: 100 Amp Panel Breaker Capacity
ITE makes a main breaker 100A panel with 30 full size spaces. Square D makes a 32 circuit 100A main breaker panel. In my opinion, a 100A main breaker panel can have as many circuit capacity that it has been listed and labeled for by a NRTL.
ITE makes a main breaker 100A panel with 30 full size spaces. Square D makes a 32 circuit 100A main breaker panel. In my opinion, a 100A main breaker panel can have as many circuit capacity that it has been listed and labeled for by a NRTL.
bphgravity
Senior Member
- Location
- Florida
Re: 100 Amp Panel Breaker Capacity
Space and load capacity aren't always the same. One could install several smaller circuits and require more space, while another installs larger circuits needing less space. In either case the loads are the same.
I've had a few custom builders that specified only two receptacle outlets per circuit in a couple of the rooms. This meant one room could have up to 4 branch circuits alone. However, as far as the service is concerned, the load applied wouldn't be any different had the 4 circuits only been one.
Space and load capacity aren't always the same. One could install several smaller circuits and require more space, while another installs larger circuits needing less space. In either case the loads are the same.
I've had a few custom builders that specified only two receptacle outlets per circuit in a couple of the rooms. This meant one room could have up to 4 branch circuits alone. However, as far as the service is concerned, the load applied wouldn't be any different had the 4 circuits only been one.
A
a.wayne3@verizon.net
Guest
Re: 100 Amp Panel Breaker Capacity
Phil I also posted that would be a violation.D.I.Y are out there just go to the big orange and look in the electrical aisle,buying pipe wire and asking how do I install this to a pimpled faced kid that just got out of H.S.This is a site for electricians not homeowners.We have paid our dues and have learned from the trade not some book we bought at a home improvement store.We here still learn everyday we go to WORK
at least I do,I don`t know it all but I know allot and am still learning as I go about my daily routine.That`s why we have jouneymen cards and masters licences.Not a deed to a home.
Phil I also posted that would be a violation.D.I.Y are out there just go to the big orange and look in the electrical aisle,buying pipe wire and asking how do I install this to a pimpled faced kid that just got out of H.S.This is a site for electricians not homeowners.We have paid our dues and have learned from the trade not some book we bought at a home improvement store.We here still learn everyday we go to WORK
at least I do,I don`t know it all but I know allot and am still learning as I go about my daily routine.That`s why we have jouneymen cards and masters licences.Not a deed to a home.
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