Hello everyone,
Hope you're all well.
I'm carrying out an overall/global insulation resistance test on a newly wired 3 phase installation we did recently. I joined all 3 phase together to neutral and tested from the busbar to earth.
I'm getting a reading of 1.33MOhms, and here in Ireland, we require a minimum of 2Mohms. I had disconnected the surge protection device previous to that. It is all RCBOs for lighting and sockets. A couple of 3 phase mcbs feeding coffee machine and oven but no appliances plugged in.
When I turned off all the mcbs and rcbos and tested busbar to earth again, I'm still getting the same reading of 1.33Mohms. Any idea what could be causing this? Is it something in circuit? Because I do have many lamps, leds etc in circuit. Is it best to disconnect all of these, which would be a monumental pain in the hole, or should the 3 phases together to neutral not negate that?
Thanks all.
Hope you're all well.
I'm carrying out an overall/global insulation resistance test on a newly wired 3 phase installation we did recently. I joined all 3 phase together to neutral and tested from the busbar to earth.
I'm getting a reading of 1.33MOhms, and here in Ireland, we require a minimum of 2Mohms. I had disconnected the surge protection device previous to that. It is all RCBOs for lighting and sockets. A couple of 3 phase mcbs feeding coffee machine and oven but no appliances plugged in.
When I turned off all the mcbs and rcbos and tested busbar to earth again, I'm still getting the same reading of 1.33Mohms. Any idea what could be causing this? Is it something in circuit? Because I do have many lamps, leds etc in circuit. Is it best to disconnect all of these, which would be a monumental pain in the hole, or should the 3 phases together to neutral not negate that?
Thanks all.