CU tidy up last hurdles are boards fuse size and earth
- Thread starter oldman2
- Start date
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If there is a fault on any circuit, not just something plugged into an external rcd (or none rcd) socket you are going to loose at least half your circuits with todays 17th edition split rcd cu's unless you go for filling with rcbo's instead.
OK so you can have rcd exemptions but most circuits will be rcd covered in the majority of cu's.
I would think that the average home owner being given a quote for a rewire and or cu update would look at the offered choice of split rcd cu or fully populated rcbo cu and go for the split unit.
I wonder how many homeowners actually test the rcd's on a routine basis?
I used to test my external socket rcd's every time I used them, but now with 5 or more circuits dropping on a test I will like many I expect be more careful when I choose to test, that doesnt seem like progressive increase in consumer safety to me.
OK so you can have rcd exemptions but most circuits will be rcd covered in the majority of cu's.
I would think that the average home owner being given a quote for a rewire and or cu update would look at the offered choice of split rcd cu or fully populated rcbo cu and go for the split unit.
I wonder how many homeowners actually test the rcd's on a routine basis?
I used to test my external socket rcd's every time I used them, but now with 5 or more circuits dropping on a test I will like many I expect be more careful when I choose to test, that doesnt seem like progressive increase in consumer safety to me.
You mean in exactly the same way that it would if he ditched the RCD sockets and only had the upstream RCD?
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Incoming phase and outgoing neutral at the downstream RCD are outgoing phase and outgoing neutral to the upstream RCD, so all it sees is an imbalance and so correctly trips...
Doh I'm talking crap - ignore me, obviously if it's between outgoing phase and neutral from the upstream RCD it will still be balanced so shouldn't trip...
The test resistor of a normal device installed downstream when the test button is pressed just appears as going across phase and neutral to any upstream device, so in my eyes, shouldn't trip the upstream device.
If you press the test button on an RCD in a caravan it doesn't take out the upstream device, even though it is of the same trip rating.
Doh - I was typing at the same time as you
If you press the test button on an RCD in a caravan it doesn't take out the upstream device, even though it is of the same trip rating.
Doh - I was typing at the same time as you
I guess for an RCD socket it might make sense for it to discharge down the earth, as then as well as testing the RCD, it's also verifying that you have earth connected properly etc (if either aren't right, the RCD won't trip so you then theoretically call in an electrician who hopefully finds the problem...)
I'd have thought it better the opposite way around - that the device shouldn't reset if no functional earth is present.
To start putting current down an earth core which is broken upstream will cause the potential in all downstream connected exposed metal parts to increase - maybe to full mains potential.
That is why when you are doing an I&T you should always do an efli test prior to doing an RCD test - and the C&G2391 like to ask that question
To start putting current down an earth core which is broken upstream will cause the potential in all downstream connected exposed metal parts to increase - maybe to full mains potential.
That is why when you are doing an I&T you should always do an efli test prior to doing an RCD test - and the C&G2391 like to ask that question
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