Shorting a fused switch for Arc Flash
Shorting a fused switch for Arc Flash
(OP)
Hi,
I am going through an arc flash remediation issue. The primary of the transformer is fed from a non fusible disconnect switch.
It is a 600 V primary system for a 225 kVA transformer.
They want to make sure that during secondary breaker operation on 208 V, arc flash hazard is limited to
Cat. 2
The suggestion was to use a fusible disconnet switch with current limiting fuse in parallel with non fusibible disconnect switch and open the non fusible switch.
Could you advise, if it is a smart and right thing to do.
I am going through an arc flash remediation issue. The primary of the transformer is fed from a non fusible disconnect switch.
It is a 600 V primary system for a 225 kVA transformer.
They want to make sure that during secondary breaker operation on 208 V, arc flash hazard is limited to
Cat. 2
The suggestion was to use a fusible disconnet switch with current limiting fuse in parallel with non fusibible disconnect switch and open the non fusible switch.
Could you advise, if it is a smart and right thing to do.






RE: Shorting a fused switch for Arc Flash
Regardless, I don't think you will be able to get the arc flash to go to Cat #2 by using a fuse on the primary side. If the issue is working on breakers in a panelboard, you might be better off putting fuses in between the panelboard and transformer.
RE: Shorting a fused switch for Arc Flash
RE: Shorting a fused switch for Arc Flash
RE: Shorting a fused switch for Arc Flash
RE: Shorting a fused switch for Arc Flash
RE: Shorting a fused switch for Arc Flash
You could consider dedicated arc-flash protection products to guarantee high speed protection --> low incident energy.