Converting a safety switch.

[Metalmasters]

Hello all,

I have a 100 amp fused safety switch that I'm moving to a new location. It will be hooked up to a welding machine. We have had in the past issues with one leg blowing and the machines buzzing like an angry bee. What I'm trying to figure out is can I convert this to a non fused switch fed to a breaker by removing the fuses and replacing with copper busbar. We don't want to have to purchase a non fused switch. Obviously the load side will be where the bus is connected so when the handle is thrown the busbar will be de-energized. Just trying to figure out if code allows this. Every time I open the book I get a headache.

Thanks in advance.

 

[kwired]

I think is possible there could be more of an issue with listing and what is allowed to be put in the fuse holders then there is an NEC issue here.

 

[zbang]

I haven't really thought about it, but would it be compliant to protect the circuit with a properly-sized breaker and put larger fuses in the disconnect? Would definitely want a sign, either in or outside the switch, explaining the larger-than-usual fuses.

'course, this depends on the cost of the fuses vs an unfused switch.

 

[kwired]

I haven't really thought about it, but would it be compliant to protect the circuit with a properly-sized breaker and put larger fuses in the disconnect? Would definitely want a sign, either in or outside the switch, explaining the larger-than-usual fuses.

'course, this depends on the cost of the fuses vs an unfused switch.

Only problem is you can't put over 100 amp fuses in a 100 amp fuse holder. You could use that logic more easily for a 40 -60 amp circuit but put fuse reducers in 100 amp fuse holders.

 

[Metalmasters]

Yeah the whole deal is we keep disconnects at each machine, shut it down at the end of the day. We just weren't trying to spend an additional $200. I can get bus sized the same as the ears on the Buss non100's that were in there for like 10 bucks. I guess I should talk to GE engineering.