Article 110.22 B

[mannyb]

Article 110.22 B.??

does this code rule say that I cant mix Square D with GE equipment. Basically i cant have a Square D Panel then run a GE panel down the line unless they are the same rating?? or brand??

 

[Carultch]

Article 110.22 B.??

does this code rule say that I cant mix Square D with GE equipment. Basically i cant have a Square D Panel then run a GE panel down the line unless they are the same rating?? or brand??

Not necessarily. What 110.22(B) is telling you, is that if you desire to take credit for a series rated combination of equipment, such that the downstream device can have a lower KAIC/SCCR rating to withstand fault current, you'd have to use a series rated combination of devices.

If you mix brands of equipment, then both devices need to be independently able to withstand the available fault current at each location. Very likely, this means that they would both have to have the KAIC/SCCR rating to meet or exceed what is required for the upstream device. But there is the possibility that the impedance of the feeder alone, can reduce the fault current by the time you connect to the downstream device, which would allow downstream device to have a lower KAIC/SCCR rating, even if not a series rated combination.

 

[MMT77002]

Article 110.22 b

Article 110.22 b

Not necessarily. What 110.22(B) is telling you, is that if you desire to take credit for a series rated combination of equipment, such that the downstream device can have a lower KAIC/SCCR rating to withstand fault current, you'd have to use a series rated combination of devices.

If you mix brands of equipment, then both devices need to be independently able to withstand the available fault current at each location. Very likely, this means that they would both have to have the KAIC/SCCR rating to meet or exceed what is required for the upstream device. But there is the possibility that the impedance of the feeder alone, can reduce the fault current by the time you connect to the downstream device, which would allow downstream device to have a lower KAIC/SCCR rating, even if not a series rated combination.

I believe this may be misleading. Series ratings of equipment is based on short circuit testing of both devices, and UL lists that combination as a series rating at an interrupting current. I doubt seriously Sq D tested anything with GE equipment and vice versa. I do agree with the statement about the system impedance, but a system study would be required to determine this --