VFD and GFI 1

[TZellers]

I've had a little bit of experience with VFDs - enough to know about the characteristic leakage current to the ground circuit. If fed a single phase input, is there anyway to get a GFI style protection?

To further state the issue: using VFDs in residential applications with either 115 or 230 volt single phase input driving a 3 phase motor for pump use. Since water is involved, I'm fairly certain that GFI are required per NFPA 70. But VFDs trip standard GFIs, so it seems a catch-22.

 

[ruggedscot]

In the UK 30mA tends to be the preferred trip, although you can specify socket RCD's with a trip of 10mA, these are like your GFI protected sockets. Trouble is with a higher voltage that we have 240 against 110 our leakage tends to be a little higher, and a conection through someone does produce more leakage than say a 110 circuit. We use 110 here to power poratable tools fed from a 55-0-55 tranny.
this isnt GFI'd as they think the leakage through 55 to ground would be 'safe'.

Rugged

 

[peebee]

You Scots are more rugged, I guess.

 

[Skogsgurra]

Big grin and a star! Valuable postings needn't be all technical. Or?

 

[ruggedscot]

Nah not rugged just well hewn from granite......

chip of the old block you see

Rugged