vern weedman
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What is a Delta Breaker in Article 408.16(E)?
Delta Breakers
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Re: Delta Breakers
It's a breaker that allowed using two phases from a single phase panel and one phase as a feed through connection.
They have been illegal since the late 70's and in the mid 70's they were for replacement only.
Imagine a three phase breaker with 4 lugs, three of which would be on the load end like any other breaker, and one lug on the other end.
Roger
[ January 29, 2004, 06:24 PM: Message edited by: roger ]
It's a breaker that allowed using two phases from a single phase panel and one phase as a feed through connection.
They have been illegal since the late 70's and in the mid 70's they were for replacement only.
Imagine a three phase breaker with 4 lugs, three of which would be on the load end like any other breaker, and one lug on the other end.
Roger
[ January 29, 2004, 06:24 PM: Message edited by: roger ]
- Location
- Wisconsin
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- PE (Retired) - Power Systems
Re: Delta Breakers
Actually all four terminals were on the same end of the breaker, similar to a 2 pole GFI except for a lug instead of a pigtail. When this breaker was plugged into the panel it took three pole spaces but only connected to two busbars.
Actually all four terminals were on the same end of the breaker, similar to a 2 pole GFI except for a lug instead of a pigtail. When this breaker was plugged into the panel it took three pole spaces but only connected to two busbars.
Re: Delta Breakers
Jim, the last one I installed was around 78 and was a SQ D. I know it has been a long time, but it took 6 spaces of the panel (1,3,5,2,4,6) and although it has been 26 years, I can remember it having one end to end connection. It seems as though this was a 100 or 125 amp breaker.
Roger
Jim, the last one I installed was around 78 and was a SQ D. I know it has been a long time, but it took 6 spaces of the panel (1,3,5,2,4,6) and although it has been 26 years, I can remember it having one end to end connection. It seems as though this was a 100 or 125 amp breaker.
Roger
- Location
- Wisconsin
- Occupation
- PE (Retired) - Power Systems
Re: Delta Breakers
Roger, in those days all 100A QO breakers (actually they were Q1 breakers) took the full width of a loadcenter effectively using twice the number spaces.
Roger, in those days all 100A QO breakers (actually they were Q1 breakers) took the full width of a loadcenter effectively using twice the number spaces.
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