ZS for an motor run off an inverter

Chris Pearson:

gkenyon:

So, you take Zs before the inverter (dimmer switch or electronic switch) and R1+R2 downstream.

An interesting topic, but a bit too technical for me!


However, I was thinking about the location of a VSD. If it is built into a machine, i.e. when you pick up the machine, the VSD comes too, then clearly it is not part of the fixed wiring.


If it supplies something which is part of the fabric of the building, let's say HVAC apparatus, the fixed wiring probably goes as far as the pumps or fans, etc.


It it sits on the wall adjacent to a machine, the boundary really is rather vague. Presumably it would be specified in any EICR.

If the inverter drive is part of Machinery as defined in the Machinery Directive - or in the UK the Supply of Machinery (Safety) Regulations, then BS 7671 applies to the point of connection of the Machinery with the fixed installation, and BS EN 60204-1 applies downstream. The Machinery should be delivered with suitable instructions for its future maintenance, and verification on installation.

Chris Pearson:

gkenyon:

So, you take Zs before the inverter (dimmer switch or electronic switch) and R1+R2 downstream.

An interesting topic, but a bit too technical for me!


However, I was thinking about the location of a VSD. If it is built into a machine, i.e. when you pick up the machine, the VSD comes too, then clearly it is not part of the fixed wiring.


If it supplies something which is part of the fabric of the building, let's say HVAC apparatus, the fixed wiring probably goes as far as the pumps or fans, etc.


It it sits on the wall adjacent to a machine, the boundary really is rather vague. Presumably it would be specified in any EICR.

If the inverter drive is part of Machinery as defined in the Machinery Directive - or in the UK the Supply of Machinery (Safety) Regulations, then BS 7671 applies to the point of connection of the Machinery with the fixed installation, and BS EN 60204-1 applies downstream. The Machinery should be delivered with suitable instructions for its future maintenance, and verification on installation.