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This Simple RCD Error Could Be Deadly!
- Thread starter ericmark
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The video makes perfect sense to me!
Seems a bit obvious, if the loads needs a neutral use one if it doesn't dont?
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Yes, the video makes sense, but where is the danger? If you fail to connect any live wire, the worse case scenario is it trips, where is the danger? OK, two phases to a three-phase motor can cause over heating, and lack of neutral can mean lack of any 230 volt supply needed for control etc. But these problems were not talked about.
Can you explain?
I'm with eric here. Not connecting the neutral to a 3-phase RCD will obviously cause it to trip (just as it would with a single-phase one - i.e. with the N 'bypassing' the RCD) - but I don't see what is "deadly" about that.
And the test button might not work
I'm not sure that is a particularly sensible approach - since it's only OK so long as no connected loads 'need a neutral'. I would think it far better to always connect the neutral. If it "wasn't needed" (i.e. neutral current always zero) then it will do no harm, but it's there in case the load is ever unbalanced between phases.
However, as far as I can see, never 'deadly', even with neutral connected - merely a potential inconvenience!
If there were no neutral connected and the load was not perfectly balanced across phases, the device would be 'tripped', anyway, so nothing for the test button to test
In a motor for example what would you connect it to?
It could not be connected to loads which 'did not use a neutral'. However, it would (in my opinion) be wise to connect it to the circuit in question (IF the cables of that circuit had a neutral), in case someone connected something different to the circuit.
I agree that if the circuit does not have a neutral conductor, then there's nothing to connect - but that is surely obvious?
As I said in post 3
As I said, the video makes sense to me, though not the 'dangerous' comment.
We're all agreed then! All it says is quite obvious to anyone who understands anything about RCDs - it's the "deadly error" title of the video which makes no sense!
Not quite.As I said in post 3
You wrote "if the loads needs a neutral use one if it doesn't dont". I am saying "if any of the current loads need a neutral OR if the cable of the circuit has a neutral conductor, then use one ..."
"Use one" for what if one isnt needed?
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