3 Pole MCCB to be use as 1 Pole or 2 Pole

[hhrsonsalvador]

Does the code allow the use of a 3 Pole MCCB as the Main Circuit breaker in a 1 phase distribution panel board by providing a jumper on the incoming terminals of the MCCB?:jawdrop:

 

[Jraef]

Does the code allow the use of a 3 Pole MCCB as the Main Circuit breaker in a 1 phase distribution panel board by providing a jumper on the incoming terminals of the MCCB?:jawdrop:

Can't speak for Phillipine codes, but we don't care, although its a waste of space and money. As to jumping terminals however, if you mean in parallel, that is an emphatic NO! Current will be split across the parallel poles, rendering the trip values meaningless and risking a fire.

If you meant that must you wire two of the poles in series, that depends on the instructions from the breaker mfr. Many IEC designed MCCBs will require this, because they will have a thermal trip mechanism that will nuisance trip if there is no current flowing in all three poles. Most older NEMA design breakers do not have that problem, so you can just use any 2 of the 3 poles. Only your MCCB breaker mfr can answer that question for you.

But also, you may find it difficult to mount or adapt a 3pole breaker into a single phase distribution panel, because it only has 2 bus bars, so why would the panel mfr allow for mounting a 3 pole main? Not saying it can't be done, I'm just pointing out another possible glitch that must be investigated prior to purchase, as it can't stump you at the last second in the field. I hate those situations...