ptonsparky
Tom
- Occupation
- EC - retired
A picture of the panel would be nice.
Removing 1/2 of MWBC (one phase)
- Thread starter thomasg88
- Start date
- Location
- Illinois
- Occupation
- retired electrician
Through the 1999 code lighting and appliance panelboard were limited to 42 circuits.
- Location
- Tennessee NEC:2017
- Occupation
- Semi-Retired Electrician
That's what I thought. I didn't remember exactly when it changed, but knew it was in that era.
THIS
Would be good to see how the bussing and breaker placement is.
Come to think of it, isn't 1929 early for breakers anyway? Wouldn't it have been fuses?
Joethemechanic
Senior Member
- Location
- Hazleton Pa
- Occupation
- Electro-Mechanical Technician. Industrial machinery
If this is K&T and you are updating it at receptacles to provide a ground, why aren't you doing a home run back to the panel? If not, how are you getting a ground wire there?
- Location
- Wisconsin
- Occupation
- PE (Retired) - Power Systems
The OP says the wiring is from the 1920s, he does not mention the age of the panel nor how many circuits are in it.
ptonsparky
Tom
- Occupation
- EC - retired
It could be 24 circuit. 24/30. IDK.
- Location
- Tennessee NEC:2017
- Occupation
- Semi-Retired Electrician
He said the panel was replaced in the early 1990's. That's why we questioned having a circuit #23.
- Location
- Wisconsin
- Occupation
- PE (Retired) - Power Systems
I missed that in post 12, but where did the number of circuits come from?
ptonsparky
Tom
- Occupation
- EC - retired
Typical numbering is odds on left, even on right. 23 on left would indicate 46 circuit panel.
- Location
- Tennessee NEC:2017
- Occupation
- Semi-Retired Electrician
Since a panel has odd number circuits on one side, and even on the other, we just figured when he said circuit #23 that there would have a even number #46 on the other. Of course he didn't say what kind the panel was, so it could just be one row of breakers.
- Location
- Tennessee NEC:2017
- Occupation
- Semi-Retired Electrician
Stop typing faster than me!
- Location
- Wisconsin
- Occupation
- PE (Retired) - Power Systems
Not if it was a Pushmatic panel.
I am not aware of any residential panel UL listed with more than 42 circuits built prior to 2010ish.
Sounds like non-CTL tandems have possibly been added as others are thinking. Of course this is a violation.
ptonsparky
Tom
- Occupation
- EC - retired
oops, sorryJohnatrightway
New member
If typical numbering is as you stated if #23 is on the Left then wouldn't #24 be on the Right, meaning a minimum 24 circuit panel?
kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
Time flies, your 10 years ago has been about 20 years ago or even a little more. Handle ties on all MWBC's came required maybe 2005 NEC? Give or take one code cycle?
IIRC the handle tie was required even well before then if supplying devices on same yoke.
kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
A 24 circuit panel would have #23 as the bottom left position if numbering started at top left.
Those were very common in 1990 and even from say 1965 to present.
kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
Even the new member picked up on it
ptonsparky
Tom
- Occupation
- EC - retired
Yes...I was backasswards again.Even the new member picked up on it