Fault finding query

[UKMeterman]

The problem can still occour with single phase, google the rcd handbook page 37 onwards

 

[dav1980]

Thanks guys, I was wondering what the leakage on the fittings would normally be. So if 2mA x 20 fittings = only 40mA so is well under the 210mA my rcd is tripping at on the ramp test.

So so probably a combination of old control gear and possible contactor issue. What about my rcd? I thought I should be changing it as its tripping well under 300mA?

 

[UKMeterman]

Again, HID lamps make a lot of noise and there may also be a faulty one which is breaking down when the ignitor goes off at turn on, spikes of several KV. Please read the notes I mentioned above, and split the load into several RCDs so one fault does not cause darkness.

 

[dav1980]

Again, HID lamps make a lot of noise and there may also be a faulty one which is breaking down when the ignitor goes off at turn on, spikes of several KV. Please read the notes I mentioned above, and split the load into several RCDs so one fault does not cause darkness.

I get what you are saying , the ideal setup would be individual rccbs.

To put you in the picture , this site is one which very shortly will no longer be maintained by my company and as such I have been instructed to keep the spend to a minimum. All I'm looking to do is get the lights switching normally through the controller.

Ill remove the switch and contactor and replace the rcd , also get up and replace any dodgy looking parts in the fittings.

cheers

 

[UKMeterman]

Check to see if there are any duff lamps and get your megger out, see if any fittings are leaky to earth if so get your ladder out!

 

[dav1980]

Got a mewp hire next week so I'll see what's up there then. Lights are on 24/7 for the moment . Thankfully this site will be gone shortly , nothing but hassle from it.

 

[Leesparkykent]

Thanks guys, I was wondering what the leakage on the fittings would normally be. So if 2mA x 20 fittings = only 40mA so is well under the 210mA my rcd is tripping at on the ramp test.

So so probably a combination of old control gear and possible contactor issue. What about my rcd? I thought I should be changing it as its tripping well under 300mA?

Was the load disconnected when ramp testing the RCD?

 

[dav1980]

Was the load disconnected when ramp testing the RCD?

Yes mate.

 

[Leesparkykent]

Yes mate.

The BS requirements for RCDs states that the RCD should operate between 50% and 100% of its rated tripping current.

 

[dav1980]

The BS requirements for RCDs states that the RCD should operate between 50% and 100% of its rated tripping current.

So mines is tripping at around 70%. Might change it over anyway and hope for the best.