 Re: Testing Zs at Lighting switch's with no neutral
Dan
connect line (used to be called phase) to earth bar at the cu (supply isolated obviuosly!)
and measure between line and cpc at the light switch on low resistance ohms. This is your (R1+R2) value, and when added to the Ze is your ZS. Its very unlikely this will be recorded on your schedule of test results, as the highest Zs value should be a the switched live conductor on the last light in the circuit.
If you measure Zs at the switch, you are (in theory) contravening the Electricity at Work Regulations |