Hi August;
250.162(A) says "operating at greater than 50 v", which a 48 v nominal
system operates most of the time at over 50 v, at least when solar
charging and/or selling back.
We used to get dinged many years ago for using breakers rated at 50v dc
on 48 v systems. John Wiles used to insist we use the highest possible
voltage (Voc of modules on coldest day)
Personally I prefer ungrounded systems, so I'm not saying there's
anything wrong from a safety stand point, just that inspectors here
don't see it the same way.
R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760
On 4/15/2013 2:20 PM, August Goers wrote:
Hi Drake,
The Sunny Island System runs at 48 V nominal so I don't believe
250.162(A) applies. We have some really savvy inspectors in the Bay
Area and they were happy for us to be ungrounded since we're operating
at 48 V. Yes, the actual voltage might go above 50 V when charging but
I believe it is the nominal voltage that the code cares about.
Best,
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