multiwire branch circuits

Merry Christmas
Status
Not open for further replies.
brother said:
I would like to think , less power (punn intended) to us and it keeps us safe. ;)
Click to expand...

Oh, I see, your thinking about the "unqualified person", hmmm, I don't know why they would have their hands in a MWBC in the first place.

Roger
 
roger said:
I don't know why they would have their hands in a MWBC in the first place.
Click to expand...

I wouldn't expect an unqualified person to even know what a MWBC is, let alone how to work on one safely. All the more reason why this code rule is a step in the wrong direction. :mad:
 
Well when we start turning off lots of lights and outlets for simple upgrades or maintenance well just tell the customer sorry "new codes wont allow us to work hot" well piss off enough customers to have it changed back.
 
tonyou812 said:
Well when we start turning off lots of lights and outlets for simple upgrades or maintenance well just tell the customer sorry "new codes wont allow us to work hot" well piss off enough customers to have it changed back.
Click to expand...


Doubt it...
 
How easy is it to remove/bypass a handle tie?

If a properly qualified electrician can easily remove the handle tie, do the work, and then re-install the handle tie, then IMHO the biggest negatives of this code rule are answered. A handle tie doesn't cause a common trip, and if it can be bypassed then the single circuit can be turned off.

It means more labor in laying out the panel in the first place, a negative, but also makes it clearer than MWBCs are being used; a significant benefit.

-Jon
 
winnie said:
If a properly qualified electrician
Click to expand...
Jon, let's not add any more adjectives to what's required than those that already exist. If the CMP's get wind of this additional description that will bring a whole new light onto doing electrical work.:D I've been doing this - what - a good three weeks now and some longer than me !!! It's bad enough (for whomever) to determine who's qualified, now it will have to be determined who's properly qualified. Who's job will it be to determine that :-?
A handle tie doesn't cause a common trip
Click to expand...
:-? Is its only purpose to manually shut off all phases connected to the breakers ? How do molded case two pole and three pole breakers work differently ?
 
goldstar said:
How do molded case two pole and three pole breakers work differently ?
Click to expand...

Can't tell if you're being sarcastic or not. molded case two and three pole breakers have internal trips between legs, so that if one trips they all trip. The "off" force from a single pole tripping breaker is hardly ever enough force to trip an adjoining-handle-tied-only breaker.
 
Jeremy,

Thanks for the reply. The first paragraph was sarcasm. Just trying to get some yucks.:D However, I wasn't aware that the handle tie was specifically used for common manual disconnect only and should not be used as a common trip device for adjacent s/p breakers. I suspected as much but was never really sure. I'm getting old but I still learn a lot here. Thanks again.

Phil
 
Phil- you're only +/-33 posts from hitting 1k. Congratulations!

Some on here will say that a common handle tie on multiple single pole breakers will have enough force to trip off the other breakers. I've never seen that happen. I have seen many instances where one trips and the other handle-tied-only breaker(s) stayed in the on position. So I'm of the opinion that it just doesn't really hardly ever happen.
[/opinion]
 
Jeremy,

I'm taking your word for it. I'm sure we've all seen the homeowners' finishing nail thru 2 breakers trick and somehow that seemed to work. However, I wouldn't bet my safety on it. I'd rather take your word as being accurate.

This should make 968. I'm not one of the charter members of the forum but I go pretty far back. I probably had 100 or 200 in the archives before we changed over to the new format. Got a long way to go to catch up with Bob (iwire) though. I'm not sure who can talk more - him or my wife.:D
 
Phil if you look at a 2 or 3 pole breaker somewhere on it will be the words "Internal Common Trip"

Or you can do what I did, grab a drill, drill out the rivets and take a look inside one. :cool:
 
goldstar said:
:-? Is its only purpose to manually shut off all phases connected to the breakers ? How do molded case two pole and three pole breakers work differently ?
Click to expand...
That's correct.

Next time you have a breaker in your hand, look for what appears to be a plastic flat-blade screwdriver slot in a hole on one or both sides. Set the breaker and then turn that slotted piece. *click* It will trip off, all poles, and without the handle tie.

Most multi-pole breakers have a rectangular piece of material (typ. phenolic or metal) between the breaker bodies, connecting the slotted pieces. When one pole trips, its slot turns, which causes the other pole(s) to trip. That's the "internal trip."

Some bodies are different, like QO's, and some don't have the slotted piece exposed, but with most types, if you hold them up to a light and look between the bodies, you can see a place where something is between the halves, that does not like up with the rivets.
 
goldstar said:
Then you must be telepathic :D What a great quality.
Click to expand...

Hey, I think you're on to something !

Next time your wife asks why you're not paying more attention to her, tell her you're conveying your feelings telepathically.

That's almost as good as the football player, Tony Romo, that gave Jessica Simpson a "promise" ring, not an engagement ring, a "promise" ring. . You just promise "your love" and don't go any farther. . Jessica was all teary eyed.

That guy's a genius !!
 
Status
Not open for further replies.
Top