Rory
7th February 2009, 10:49 AM
This is a bit long winded but please bear with me,
I have just finished wiring in a new oven and hob onto an existing ring circuit, (separate appliances), plugged in to unswitched socket outlets and controlled by fused spurs above the worktops. These are gas appliances with a small electrical load for the ignitions and fan on the oven. Both appliances work when plugged in but as soon as the copper gas pipe is connected, they trip out the RCD. The main gas is bonded in 10mm earth and the house also has gas central heating which works fine. I’ve tried other appliances into the sockets and they’re fine, I’ve also tested what I’ve done and that seems fine as well. Zs readings are a bit high but within the acceptable range.
I tried plugging in a metal toaster which works fine but I put it next to the gas pipe and the same thing happened when you switch it on, the RCD trips out because it was touching the gas pipe.
I find it hard to believe that these 2 new appliances are faulty because they have there new conformity stickers on and especially the hob which is just an ignition source and it works when not connected to the gas pipe. So if there was an earth fault why wouldn’t it trip out the RCD even without the gas pipe connected?
I have never come across a fault like this before and I would be very grateful for any help, ideas or suggestions,
Many thanks,
Rory.
I have just finished wiring in a new oven and hob onto an existing ring circuit, (separate appliances), plugged in to unswitched socket outlets and controlled by fused spurs above the worktops. These are gas appliances with a small electrical load for the ignitions and fan on the oven. Both appliances work when plugged in but as soon as the copper gas pipe is connected, they trip out the RCD. The main gas is bonded in 10mm earth and the house also has gas central heating which works fine. I’ve tried other appliances into the sockets and they’re fine, I’ve also tested what I’ve done and that seems fine as well. Zs readings are a bit high but within the acceptable range.
I tried plugging in a metal toaster which works fine but I put it next to the gas pipe and the same thing happened when you switch it on, the RCD trips out because it was touching the gas pipe.
I find it hard to believe that these 2 new appliances are faulty because they have there new conformity stickers on and especially the hob which is just an ignition source and it works when not connected to the gas pipe. So if there was an earth fault why wouldn’t it trip out the RCD even without the gas pipe connected?
I have never come across a fault like this before and I would be very grateful for any help, ideas or suggestions,
Many thanks,
Rory.