Supply side fusible disconnect

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GerryB

Senior Member
Location
woodbridge, ct. USA
I thought 60 amp was the minimum size fusible disconnect, suitable for use as service equipment, that you could use. I saw a 30 amp Sq D fusible disconnect today that said suitable for use ... So that can be used? The line taps still need to be #6.
 
There's been a pretty big lack of clarity from the code as to whether a disconnect for a PV supply side connection is even a service disconnect and subject to those rules.
 
There was a time when everyone treated PV supply side interconnections like they were service entrances since that provided a well-worn path in the NEC for how to design them. But maybe 10 years ago or so there was a shift to not considering the PV interconnection to be a service entrance and not holding it to the service entrance design requirements. One of the biggest ramifications of this was the removal of the PV disconnect from the six maximum service disconnect limit. So while 230.79 does provide guidance on minimum sizes for service entrances it does not apply to PV. With the 2020 NEC addition of section 705.11 for supply-side interconnections, this was made more explicit.
 
pv_n00b said:
There was a time when everyone treated PV supply side interconnections like they were service entrances since that provided a well-worn path in the NEC for how to design them. But maybe 10 years ago or so there was a shift to not considering the PV interconnection to be a service entrance and not holding it to the service entrance design requirements. One of the biggest ramifications of this was the removal of the PV disconnect from the six maximum service disconnect limit. So while 230.79 does provide guidance on minimum sizes for service entrances it does not apply to PV. With the 2020 NEC addition of section 705.11 for supply-side interconnections, this was made more explicit.
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That's good to know. We are on 2017 but were supposed to adopt 2020 in Oct. but now on hold.
 
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