SMA Combi-Switch questions about UL rating [RE-wrenches]
Larry Crutcher, Starlight Solar
larry at starlightsolar.com
Fri Dec 14 15:51:00 PST 2007
> Larry, the way I understand it Sq D makes this switch for SMA (both
> German companies). Why would they agree to do this if it can't be used
> for anything? I mean if you can't put 4 strings on it what is it?
>
> It happens we have used it only with the Sharp 170 so far. Isc is 5.5
> so 2 strings on 1 pole is 11 amps. Its rated for 11.5 amps short
> circuit. Maximum current is 18 amps per pole. I think this is the
> intended use and also that Sq D and SMA make good products and have good
>
> engineering. But I may be all wet. You know - like the time I thought I
>
> was wrong but it turned out I was right after all?
That's the point of my question, why did (could) they do this? If the
switch was originally de-rated by Sq D to 11.5 amp per disconnect, not
per pole, to receive a UL listing, bla, bla...
If it will not cause arcing or be a fire hazard, that's a good thing.
Sorry for being anal-retentive here but it is still illogical to me.
Thanks for all the suggestions.
Larry Crutcher
Starlight Solar
Yuma, AZ
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