UL for ac recombiner box

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jjavier

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We asked our local engineer and tell us that UL508A works with ac combiner box (output of inverters), but UL says that must be UL1741

What is thr UL that you require un ac boxes in solar plants (ac protection of inverters)?
 
UL

UL

Do you know an Ul contact to confirm that?

The problem is that our supplier says that needs UL to be agree wtih this.
 
I don't know a contact. Ty calling them back and say you made a mistake and you just need to know the correct UL standard for an AC panelboard. Don't use the term 'combiner.'
Also I don't know why your supplier can dictate anything to you. You buy from them.
 
incidentally, UL508a says this:

1.16 Equipment for the control of fuel cells, photovoltaic systems, or utility interactive systems are
covered by the Standard for Inverters, Converters, Controllers and Interconnection System Equipment for
Use With Distributed Energy Resources, UL 1741
Click to expand...
 
JMBreaker said:
Page 24 of http://www.ul.com/wp-content/uploads/2014/04/AlternativeEnergy_AG.pdf also lumps all QIIO "Distributed Generation Power Systems Accessory Equipment" as UL1741. That may be what the UL person on the phone is referencing.

Perhaps see if you can verify that other manufacturers have this rating as opposed to UL508.
Click to expand...

Thanks for the link.

Check out the diagram on the very last page.
The distribution panel would be UL 67.

To repeat, don't use the word 'combiner' on the AC side in this context. It's just normal AC equipment.
 
ac box ul1471

ac box ul1471

Ul confirmed me that the union of the ac form the inverters must be UL1471.... let´s see the inspector opinion, but I can´t find ac boxes listed UL1471, anybody knows ac boxes manufacturer?


jaggedben said:
Thanks for the link.

Check out the diagram on the very last page.
The distribution panel would be UL 67.

To repeat, don't use the word 'combiner' on the AC side in this context. It's just normal AC equipment.
Click to expand...
 
To my knowledge there is no such thing as an AC panelboard listed to UL1741. There is no need for such a thing. It is unfortunate that someone at UL who has never installed solar in their life is giving you legalistic answers. I can't imagine that any inspector will give you an issue over it. Take a look at the language in article 705.12(D) that says that an inverter output can be connected 'at any distribution equipment on the premises'. There is also no requirement in the NEC that alternating current equipment for inverter outputs be listed to anything different than for other alternating current applications.
 
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