ac overcurrent device

[jjavier]

Hi

Just to be sure. Do I need in AC side (solaredge system) the overcurrent device rating---> Inverters amp*1.25? This rule is clear in conductors.

I was reeding again NEC code...

 

[Carultch]

Hi

Just to be sure. Do I need in AC side (solaredge system) the overcurrent device rating---> Inverters amp*1.25? This rule is clear in conductors.

I was reeding again NEC code...

Yes. The 125% factor applies for all inverter output OCPDs, unless the OCPD and all within its enclosure are otherwise listed as continuous duty (which is uncommon).

 

[jjavier]

240.6

240.6

Yes. The 125% factor applies for all inverter output OCPDs, unless the OCPD and all within its enclosure are otherwise listed as continuous duty (which is uncommon).

I understand that there is a 3rd option of a adjustable CB that is my situation. If we have an adjustable CB, that meets 240.6, we just need the nominal amp rating (without *1.25), don´t we?

 

[Carultch]

I understand that there is a 3rd option of a adjustable CB that is my situation. If we have an adjustable CB, that meets 240.6, we just need the nominal amp rating (without *1.25), don´t we?

If you have an adjustible trip breaker, it is still 1.25*I_continuous that sizes your breaker trip setting. Unless the unit is otherwise listed and labeled continuous duty.

 

[jcleavit]

Yes you can go 100% on an adjustable breaker because they are 100% rated but be careful. Depending on what style of breaker it is they are generally about double the price. We just quoted some breakers for a I-line Square D panel and the normal breaker was $4000 and the adjustable was $7000. I'm sure you won't see prices this high but the point is be prepared to pay significantly more for the adjustable opposed to the 125% sized breaker.