In a TT system in commercial premises with 100mA main switch , does all circuits need to be 30mA rcd protected... Can't think of the sums for this 1. But I will say yes.
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The one's we are supplied , are steel with a copper coating and have been for as long as I can remember / have noticed !?
Edit ; I have wondered in the past if solid copper alternatives are available , but I suppose they will not really be up to the punishment , unless they are just being laid in a trench .
Well are boss said has to be less than 20 ohms. Where he got this figure I don't know.
We used sledge hammer, what else can you use? Also are them rods steel with copper coating???
I mentioned that and he looked at me like I was a creator
Yes it's 20ohms it's in the blue hazardous area regs book. Can't remember the name of it. I was working in a gas plant with an ex comp spark, when I had a look at it
I'm buggered if i'd ever accept 20 ohms on a Gas Plant installation!!
We were happy with 1667 ohms and one of those twigs u like so much lol
Yes it's 20ohms it's in the blue hazardous area regs book. Can't remember the name of it. I was working in a gas plant with an ex comp spark, when I had a look at it
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