What is the principle behind “circuit total limitation” (CTL) for electrical panels?How can I...
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What is the principle behind "circuit total limitation" (CTL) for electrical panels?
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What is the principle behind “circuit total limitation” (CTL) for electrical panels?
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Contemporary electrical panels/loadcenters limit the number of tandem circuit breakers that can be used. Is this because areas of the underlying panel bus bars can overheat despite all of the individual breakers (including the main) operating below their rated trip current? Or is it because of the risk of a neutral slot being used by more than one circuit? Both? Something else?
electrical-panel circuit-breaker
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Contemporary electrical panels/loadcenters limit the number of tandem circuit breakers that can be used. Is this because areas of the underlying panel bus bars can overheat despite all of the individual breakers (including the main) operating below their rated trip current? Or is it because of the risk of a neutral slot being used by more than one circuit? Both? Something else?
electrical-panel circuit-breaker
asked 2 hours ago
WerdnaWerdnaWerdnaWerdna
61
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Contemporary electrical panels/loadcenters limit the number of tandem circuit breakers that can be used. Is this because areas of the underlying panel bus bars can overheat despite all of the individual breakers (including the main) operating below their rated trip current? Or is it because of the risk of a neutral slot being used by more than one circuit? Both? Something else?
electrical-panel circuit-breaker
asked 2 hours ago
WerdnaWerdnaWerdnaWerdna
61
New contributor
WerdnaWerdna is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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Contemporary electrical panels/loadcenters limit the number of tandem circuit breakers that can be used. Is this because areas of the underlying panel bus bars can overheat despite all of the individual breakers (including the main) operating below their rated trip current? Or is it because of the risk of a neutral slot being used by more than one circuit? Both? Something else?
electrical-panel circuit-breaker
electrical-panel circuit-breaker
asked 2 hours ago
WerdnaWerdnaWerdnaWerdna
61
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asked 2 hours ago
WerdnaWerdnaWerdnaWerdna
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asked 2 hours ago
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asked 2 hours ago
WerdnaWerdnaWerdnaWerdna
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asked 2 hours ago
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3 Answers
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votes
It is to limit the total number of circuits, and so the total load on the bus etc. It doesn't have anything to do with the neutrals.
answered 2 hours ago
batsplatstersonbatsplatsterson
12.4k11537
add a comment |
Circuit Total Limitations comes from a requirement way back in the 1960's where the NEC required panel board manufactures to limit the total number of circuit breakers a panel could contain.
The principle was probably safety and prevention of fire due to the advent of tandem breakers possibility of being overused beyond the panel boards listed capacity.
answered 1 hour ago
KrisKris
4,1822730
1
*Kris, I think that was 1968.
– batsplatsterson
29 mins ago
1
In the days before silicon, when no load existed below about 100W.
– Harper
26 mins ago
add a comment |
Isn’t that the purpose of the main breaker though? What’s the harm in having a thousand breakers if they all draw 0.01 amp?
answered 11 secs ago
WerdnaWerdnaWerdnaWerdna
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3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
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votes
active
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votes
It is to limit the total number of circuits, and so the total load on the bus etc. It doesn't have anything to do with the neutrals.
answered 2 hours ago
batsplatstersonbatsplatsterson
12.4k11537
add a comment |
It is to limit the total number of circuits, and so the total load on the bus etc. It doesn't have anything to do with the neutrals.
answered 2 hours ago
batsplatstersonbatsplatsterson
12.4k11537
add a comment |
It is to limit the total number of circuits, and so the total load on the bus etc. It doesn't have anything to do with the neutrals.
answered 2 hours ago
batsplatstersonbatsplatsterson
12.4k11537
It is to limit the total number of circuits, and so the total load on the bus etc. It doesn't have anything to do with the neutrals.
answered 2 hours ago
batsplatstersonbatsplatsterson
12.4k11537
answered 2 hours ago
batsplatstersonbatsplatsterson
12.4k11537
answered 2 hours ago
batsplatstersonbatsplatsterson
12.4k11537
answered 2 hours ago
batsplatstersonbatsplatsterson
12.4k11537
12.4k11537
add a comment |
add a comment |
Circuit Total Limitations comes from a requirement way back in the 1960's where the NEC required panel board manufactures to limit the total number of circuit breakers a panel could contain.
The principle was probably safety and prevention of fire due to the advent of tandem breakers possibility of being overused beyond the panel boards listed capacity.
answered 1 hour ago
KrisKris
4,1822730
1
*Kris, I think that was 1968.
– batsplatsterson
29 mins ago
1
In the days before silicon, when no load existed below about 100W.
– Harper
26 mins ago
add a comment |
Circuit Total Limitations comes from a requirement way back in the 1960's where the NEC required panel board manufactures to limit the total number of circuit breakers a panel could contain.
The principle was probably safety and prevention of fire due to the advent of tandem breakers possibility of being overused beyond the panel boards listed capacity.
answered 1 hour ago
KrisKris
4,1822730
1
*Kris, I think that was 1968.
– batsplatsterson
29 mins ago
1
In the days before silicon, when no load existed below about 100W.
– Harper
26 mins ago
add a comment |
Circuit Total Limitations comes from a requirement way back in the 1960's where the NEC required panel board manufactures to limit the total number of circuit breakers a panel could contain.
The principle was probably safety and prevention of fire due to the advent of tandem breakers possibility of being overused beyond the panel boards listed capacity.
answered 1 hour ago
KrisKris
4,1822730
Circuit Total Limitations comes from a requirement way back in the 1960's where the NEC required panel board manufactures to limit the total number of circuit breakers a panel could contain.
The principle was probably safety and prevention of fire due to the advent of tandem breakers possibility of being overused beyond the panel boards listed capacity.
answered 1 hour ago
KrisKris
4,1822730
edited 23 mins ago
answered 1 hour ago
KrisKris
4,1822730
answered 1 hour ago
KrisKris
4,1822730
answered 1 hour ago
KrisKris
4,1822730
4,1822730
1
*Kris, I think that was 1968.
– batsplatsterson
29 mins ago
1
In the days before silicon, when no load existed below about 100W.
– Harper
26 mins ago
add a comment |
1
*Kris, I think that was 1968.
– batsplatsterson
29 mins ago
1
In the days before silicon, when no load existed below about 100W.
– Harper
26 mins ago
1
1
*Kris, I think that was 1968.
– batsplatsterson
29 mins ago
*Kris, I think that was 1968.
– batsplatsterson
29 mins ago
1
1
In the days before silicon, when no load existed below about 100W.
– Harper
26 mins ago
In the days before silicon, when no load existed below about 100W.
– Harper
26 mins ago
add a comment |
Isn’t that the purpose of the main breaker though? What’s the harm in having a thousand breakers if they all draw 0.01 amp?
answered 11 secs ago
WerdnaWerdnaWerdnaWerdna
1
New contributor
WerdnaWerdna is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
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Isn’t that the purpose of the main breaker though? What’s the harm in having a thousand breakers if they all draw 0.01 amp?
answered 11 secs ago
WerdnaWerdnaWerdnaWerdna
1
New contributor
WerdnaWerdna is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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Isn’t that the purpose of the main breaker though? What’s the harm in having a thousand breakers if they all draw 0.01 amp?
answered 11 secs ago
WerdnaWerdnaWerdnaWerdna
1
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Isn’t that the purpose of the main breaker though? What’s the harm in having a thousand breakers if they all draw 0.01 amp?
answered 11 secs ago
WerdnaWerdnaWerdnaWerdna
1
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answered 11 secs ago
WerdnaWerdnaWerdnaWerdna
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answered 11 secs ago
WerdnaWerdnaWerdnaWerdna
1
answered 11 secs ago
WerdnaWerdnaWerdnaWerdna
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1
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