ECN Forum Forums Code Related Discussion NEC & other Code issues 801a. Fuse

...from the ECN Archives ...
(Dan Neeser is from Bussmann)
https://www.electrical-contractor.net/ubb/Forum1/HTML/001080.html

[This message has been edited by Bill Addiss (edited 12-08-2005).]

Earlydean:
I had the same thought as you, but thought it out again.

Not having a Bussman Catalog handy, does not a 601 amp fit an 800 amp disco, and the 801 fits the 1200 amp disco I'm familiar with the adaptors for 30-60-100-200 sizes, and never seen anything larger.

'601' is referenced within 240-6 (A) but '801' is not.

Now that I said all of that......still??????

jOHN

Here's the deal per the Bussman rep. The contractor could install a 800a. or 1200a. Safety Switch with conductors that were only adequate for 600a. Now if the customer decides to expands his capacity to 800 or 1200 amps all he needs to do is change the conductors and the fuse and not have to change the switch. This is apparently is a significant cost saving measure. From what Bussman is telling me, it's the only "Listed" way of doing this sort of thing. Works for me.

I have seen this done with 400a equipment and 225a fuses. It bothered me so much I have a proposal in the 1999 ROP.
CMP10 said nobody would be dumb enough to shove a 300 or 400a fuse in there without upsizing the conductors so it wasn't a problem. I guess they never saw a "maintenance man"/electrician.

Has CMP 10 never seen pennys in the fusebox? Or copper pipe in the fuse holder? Or even #12 copper wire jammed into the fuse holder or meter socket?