Networks in Resy

[peter d]

LOL

You have not read the whole thread yet have you?

Nope!

Doh!!!


I still can't believe you had me do that. You...of all people. [shakes head in disbelief]

 

[iwire]

I still can't believe you had me do that. You...of all people. [shakes head in disbelief]

Hey if you could have made that single phase Bulldog panel into a 3 phase 4 wire panel.....

 

[peter d]

Hey if you could have made that single phase Bulldog panel into a 3 phase 4 wire panel.....

I'm sure there was one somewhere in the building we could have used. As for what voltage it would be....well, that's another story.

 

[George Stolz]

Hey if you could have made that single phase Bulldog panel into a 3 phase 4 wire panel.....

Was it a single phase 120V panel? As in, no 240?

I guess I'm not picturing it.

 

[iwire]

As we where in a huge....even bigger than huge, commercial building we assumed every panel was 3 phase four wire.

It turned out after another crew piped to this panel it was 120/240.

I could have done one MWBC and a two wire but it would not save me CCCs in the raceway and the panel was really jammed up. That being the case I opted for all two wire circuits so I could go on any phase was available.

 

[George Stolz]

Ahh, I see.

 

[sundowner]

MWBC in resy

MWBC in resy

Thanks guys

I knew I'd get a quick responce. I am aware of the AFCI requirements for residential wiring and understand the concept of the nuetral only carrying the imbalance of the two ckts.
I was thinking more along the lines of two bedrooms, or the two kitchen SABC's where thjis would make sence . I am more familair with commercial and industrial where this is common practice, but I'm not up on whether this goes on very much in resy...hence the post.

Thanks again

Steve

 

[iwire]

Thanks guys

No problem and I am sorry if I took over your thread.

If I had to deal with expensive AFCI two pole breakers I am sure I would cut back on MWBCs.

 

[haskindm]

If you connect the MWBC ONLY to a multipole breaker, then you eliminate most of the chance that a DIY or other "unknowledgeable" person will put the two or more ungrounded conductors on the same phase. As long as the wires stay on the breaker the phasing will be correct no matter where the breaker is moved in the panel. In my experience the price of a two-pole breaker is the same as two single-pole breakers, but that may differ with the brand that is used. Of course this does not apply to multipole AFCI or GFCI breakers.

 

[DaveTap]

We use multiwire branch circuits whenever possible... but then we do everything in conduit and it lets you run more circuits with less heat. Especially important since our residential is often remodels of 100+ year old buildings, and we are typically replacing cloth covered wires to add circuits in 2nd and 3rd floor apartments without removing plaster.
I have always made an extra effort to identify which circuits share which neutrals and use colored markers to stripe each neutral and colored tie-wraps to tie the MWB wires together wherever they enter a box. I have started using common trip breakers and handle ties because it is more obvious which circuits share neutrals, but it can be annoying losing lights for 2 rooms instead of one so I often work on live circuits unless I have to break the neutral.