Hi everyone. Im on a job thats really boggling me.
So old freestanding electric cooker was tripping when hot plates are on for about 15-20mins. I did the insulation tests on the cables when disconnected at board. 999+ reading. So I thought ok must be cooker. Estate agents orders new one. I install new one and same thing happens.
So I tested cables again. Wiring is 5years old. Perfect readings all the way from consumer unit to the cooker itself when hot plates are cold.
When I put the hot plates on for 5mins, I test again at the cooker. Resistance drops o about 400ohms. When I have plates on longer about 10mins. Resistance drops to 4-5 ohms.
I have on for longer and eventually rcd trips. I test the resistance at the cooker on each individual plate and it's showing 0.
Same readings I'm getting between the earth to neutral earth to live. Is this normal for hot plates?
I have tested the rcd trip times. I've moved the cooker over to the other rcd, still tripped.
Its a Toolstation axiom dual rcd board. Maybe these rcds can't handle cookers. But then it's been working fine for 5 years. I'm thinking the new cooker is also faulty.
If anyone has any thoughts and ideas please.
Continue reading...
So old freestanding electric cooker was tripping when hot plates are on for about 15-20mins. I did the insulation tests on the cables when disconnected at board. 999+ reading. So I thought ok must be cooker. Estate agents orders new one. I install new one and same thing happens.
So I tested cables again. Wiring is 5years old. Perfect readings all the way from consumer unit to the cooker itself when hot plates are cold.
When I put the hot plates on for 5mins, I test again at the cooker. Resistance drops o about 400ohms. When I have plates on longer about 10mins. Resistance drops to 4-5 ohms.
I have on for longer and eventually rcd trips. I test the resistance at the cooker on each individual plate and it's showing 0.
Same readings I'm getting between the earth to neutral earth to live. Is this normal for hot plates?
I have tested the rcd trip times. I've moved the cooker over to the other rcd, still tripped.
Its a Toolstation axiom dual rcd board. Maybe these rcds can't handle cookers. But then it's been working fine for 5 years. I'm thinking the new cooker is also faulty.
If anyone has any thoughts and ideas please.
Continue reading...
