Non-Fused Disconnect Switches

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I have a client that has installed a Schneider non-fused disconnect switch to act as an isolation switch so maintenance can be performed on a fire pump controller. There is no upstream protection for the non-fused disconnect (it is connected to the secondary of the medium voltage transformer serving the building).

I have performed a power system study for the facility and I marked the disconnect as not being adequately rated to sustain a bolted fault. The fault-current at each device is over 23kA and my review of the Schneider literature leads me to believe the disconnect cannot withstand a fault of over 10kA.

The client has not accepted my results and I would like to know if anyone on the board would agree with him (based on the information I've provided).

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