The comment by @Dave-sparks in the "nhxlb16 vs nhxb16" thread that all sockets rated at 32A or less should have RCDs got me thinking.
I have a 32A socket in the garage which is either for the RPC to power 3 phase stuff, or a lathe which has two Siemens VFD's (main motor & coolant).
The socket is protected by a 32A type C breaker and used to be on the RCD protected side of our split consumer unit (20ish years old).
I found that the combination of the two VFD's caused the RCD to trip. Either of VFDs individually were OK, but with them both on I got tripping.
Rightly or wrongly I assumed that the cause was EMC filtering on the VFDs and moved the 32A socket to the non-RCD side.
Looks like this isn't allowed under the current regs.
Does anyone else have issues with multiple VFD's causing RCDs to trip?
I have a 32A socket in the garage which is either for the RPC to power 3 phase stuff, or a lathe which has two Siemens VFD's (main motor & coolant).
The socket is protected by a 32A type C breaker and used to be on the RCD protected side of our split consumer unit (20ish years old).
I found that the combination of the two VFD's caused the RCD to trip. Either of VFDs individually were OK, but with them both on I got tripping.
Rightly or wrongly I assumed that the cause was EMC filtering on the VFDs and moved the 32A socket to the non-RCD side.
Looks like this isn't allowed under the current regs.
Does anyone else have issues with multiple VFD's causing RCDs to trip?