480.7 is Disconnect Methods, and addresses different scenarios and voltages
(A) is for batteries "with a voltage over 60 volts dc" requiring a
disconnect accessible to and within sight of the battery
(B) is in regards to 1- and 2-family dwellings, and doesn't specify a
voltage, just that an
Did they ever explain why they were requiring it on a nominal 48 volt
system? NEC 480.7(B) (from memory, I think that is the right article) says
it is for nominal voltage of 60 volts or higher. IE your 48 volt system is
exempt.
Jay pointed this out on February 3rd.
-James Jefferson Jarvis
APRS
Friends:
Here is how this resolved for my upcoming project: I submitted a request
to the building department to waive the requirement for a DC disconnect. I
based the justification on the need to keep a pressure pump for the fire
sprinklers and a fire alarm operational. I will supply an
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