- Location
- Massachusetts
Re: subpanels
Me too!
subpanels
- Thread starter wolfman
- Start date
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Re: subpanels
I realize that my remarks upset some code officials. I do try to point out things that get lost in the translation.
I get creamed when I say the six disconnect rule is not for dumping power, it is for maintaining power. The two breaker rule for panel feeders, with the panel breaker being smaller, is for co-ordination a shut down in a fault event.
Fireman opening switches, that may be under fault conditions are not smart. Some are now known as "Stubby".
The main breaker, in a lighting panel, in a multiple occupancy unit, should trip in case of a fire shorting the wiring in the specific unit, yet allow all other power to remain on for safety egress.
There is a lot of good intent when code articles were first composed, but due to time corruption, and too many cooks, the intent has been lost.
It is time every electrician become active in the code making process, not the existing process,
but a credible, logical process.
I realize that my remarks upset some code officials. I do try to point out things that get lost in the translation.
I get creamed when I say the six disconnect rule is not for dumping power, it is for maintaining power. The two breaker rule for panel feeders, with the panel breaker being smaller, is for co-ordination a shut down in a fault event.
Fireman opening switches, that may be under fault conditions are not smart. Some are now known as "Stubby".
The main breaker, in a lighting panel, in a multiple occupancy unit, should trip in case of a fire shorting the wiring in the specific unit, yet allow all other power to remain on for safety egress.
There is a lot of good intent when code articles were first composed, but due to time corruption, and too many cooks, the intent has been lost.
It is time every electrician become active in the code making process, not the existing process,
but a credible, logical process.
ryan_618
Senior Member
- Location
- Salt Lake City, Utah
Re: subpanels
Bennie: 42 circuit panels "maintain power" just fine don't they? Pehaps I'm just not understanding you on this one.
Bennie: 42 circuit panels "maintain power" just fine don't they? Pehaps I'm just not understanding you on this one.
ryan_618
Senior Member
- Location
- Salt Lake City, Utah
Re: subpanels
If its main lug (the 42), whats the difference between it and the 6 breaker rule? Again, I'm not following you here. What do you mean when you say "maintaing power"?
If its main lug (the 42), whats the difference between it and the 6 breaker rule? Again, I'm not following you here. What do you mean when you say "maintaing power"?
Re: subpanels
Branch breakers do not protect the branch circuit. The branch breaker takes the defective equipment off line allowing the other equipment to continue on line.
The branch breaker relieves stress on the feeder by opening.
When a panel melts down the feeder breaker will not protect the panel. The breaker removes the faulty panel from the system, hopefully before other items are dumped.
The small insignificant load should be coordinated to dump first to avoid loss of everything.
Branch breakers do not protect the branch circuit. The branch breaker takes the defective equipment off line allowing the other equipment to continue on line.
The branch breaker relieves stress on the feeder by opening.
When a panel melts down the feeder breaker will not protect the panel. The breaker removes the faulty panel from the system, hopefully before other items are dumped.
The small insignificant load should be coordinated to dump first to avoid loss of everything.
hurk27
Senior Member
- Location
- Portage, Indiana NEC: 2008
Re: subpanels
It allows anyone in the area to be able to safely shut down the power in the event of a electrocution taking place. It would also be a good argument for the 6 movements of the hand rule as the breakers could be shut down without much thinking (first thing that goes in a fast acting emergency) The idea is to be able to shut down the power without trying to figure out which breaker will do it.
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