enverd
Electrical
- Oct 25, 2010
- 47
A contractor sent an RFI (referring to 430.31) indicating that VFDs that are coming with AC units must have fused protection.
I am providing just feeders as requested by mechanical engineer, to single point of connection, connecting to VFD which has an integral disconnect.
it seems as if the contractor is saying that we need to provide a separate disconnect (fused disconnect possibly) to protect the VFD and the AC Unit.
Can someone shed some light on it and let me know if I do need an additional disconnect?
Thanks in advance.
I am providing just feeders as requested by mechanical engineer, to single point of connection, connecting to VFD which has an integral disconnect.
it seems as if the contractor is saying that we need to provide a separate disconnect (fused disconnect possibly) to protect the VFD and the AC Unit.
Can someone shed some light on it and let me know if I do need an additional disconnect?
Thanks in advance.