No, as long as the circuit has over current protection, the local disconnect does not need fusing
Generally speaking, a disconnecting means never needs to be fused. However, there are requirements where a disconnect is not fused, OCPD must be installed immediately adjacent thereto, such as service disconnecting means.When does a disconnect need to be fused?
I wired a 3 phase 10.5KW electric oven. Does the disco need fuses?
As I recall, the SCCR does factors into required fusing, not as a directly per NEC, but rather a consequence of equipment selection.It needs to be fused if the short circuit current available at the switch is >5kA. Regular safety switches have a low SCCR.
NEC 110.10 requires 'non-protective' equipment to be used within its ratings (SCCR) based on available fault current.As I recall, the SCCR does factors into required fusing, not as a directly per NEC, but rather a consequence of equipment selection.
Generally speaking, a disconnecting means never needs to be fused.
Exactly... but that's not a direct requirement to fuse the disconnect. It's a consequence of equipment rating.NEC 110.10 requires 'non-protective' equipment to be used within its ratings (SCCR) based on available fault current.
It is a direct requirement to properly apply the disconnect, you are correct that the NEC does not directly say how to do it. Another case, proving the NEC is not a design manual.Exactly... but that's not a direct requirement to fuse the disconnect. It's a consequence of equipment rating.
I install a non-fused disconnect for the oven. On the inspection the inspector said it should be fused. I questioned him on it and he told me not to worry about it.
For my own sake, I wanted to follow up on it. It sounds like the consensus is that non-fused is acceptable.
If required overcurrent is already provided upstream then overcurrent protection is not required at any disconnecting means located at equipment.I install a non-fused disconnect for the oven. On the inspection the inspector said it should be fused. I questioned him on it and he told me not to worry about it.
For my own sake, I wanted to follow up on it. It sounds like the consensus is that non-fused is acceptable.