Maximum fuse size
- Thread starter rose1981
- Start date
- Status
- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
If maximum fuse size rather than maximum OCPD size is specified you cannot use a breaker anyway.
And a 90A fuse would be too large.
- Location
- Massachusetts
Yes, and you have to use a fuse if it only lists a fuse size.
ggunn
PE (Electrical), NABCEP certified
- Location
- Austin, TX, USA
- Occupation
- Consulting Electrical Engineer - Photovoltaic Systems
Why would you need both?
That would probably be the least costly.
When the panelboard was designed, the equipment called for 90Amp MOP and I have asked them to provide 90Amp MOCP in the panelboard. But now the mech contractors have submitted a slightly different model that calls out for 80Amp max fuse size. So what are the other options?
90A panelboard breaker, as ordered.
80AT/100AF fused disconnect.
Backcharge mech contractors for the disconnect, misc mat'ls, and extra labor.
petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- engineer
The breaker rating in the panel does not matter much. The rating can pretty much be whatever you want to make it and still meet code as long as you abide by the tap rules, or the conductors coming off the CB are not a tap.
- Location
- Massachusetts
How would you do it? :?
- Status