elcb
- Thread starter sijaysee
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Do you mean one of the old voltage operated ELCBs ?
How much electrical work has been done?
Then yes otherwise your new install will not comply with BS7671, unless the new CU is being fed from before the ELCB and has its own 100mA TD RCD and you also need to include a 30mA RCD for the socket outlets.
BTW the NICEIC has nothing to do with this.
BTW the NICEIC has nothing to do with this.
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Voltage Operated ELCB's were deleted from the 15th Edition in 1985.
They are not deemed an acceptable form of protection anymore.
They only sensed fault current travelling down the cpc, not current flowing to earth via anything else.
TCALSS, RCD's monitor what goes out and what comes back, if there is a discrepancy greater than the level of current it is designed to trip at, then off it goes. It does not matter whether this current is draining to earth via a cpc, earthed metalwork, or a human being.
They are not deemed an acceptable form of protection anymore.
They only sensed fault current travelling down the cpc, not current flowing to earth via anything else.
TCALSS, RCD's monitor what goes out and what comes back, if there is a discrepancy greater than the level of current it is designed to trip at, then off it goes. It does not matter whether this current is draining to earth via a cpc, earthed metalwork, or a human being.
Just had a look through my extensive photo achive, and you're in luck!
Voltage operated ELCB (Note the earths connected to it)
Current operated
Voltage operated ELCB (Note the earths connected to it)
Current operated
Ah,
That voltage ELCB pic is exactly what I will be replacing next week with a 100ma RCD in a TT installation.
The interesting thing is that when the kitchen was done in 2005, the installers spent ages digging to fit an earth rod and get an acceptable Ze, then left this protecting the new lighting and fixed equipment circuits on the new split load CU they installed (sockets and jacuzzi on a 30ma RCD).
They also completed a green NICEIC certificate stating that there was a 100ma 100A RCD, and quoted a trip time of 21ms.
OOI, should the rcd test function on a current meter (Megger 1552 in my case) still operate this? Do they test by putting a fault current on the earth, or create an inbalance between live/neutral in some other way?
Gavin
That voltage ELCB pic is exactly what I will be replacing next week with a 100ma RCD in a TT installation.
The interesting thing is that when the kitchen was done in 2005, the installers spent ages digging to fit an earth rod and get an acceptable Ze, then left this protecting the new lighting and fixed equipment circuits on the new split load CU they installed (sockets and jacuzzi on a 30ma RCD).
They also completed a green NICEIC certificate stating that there was a 100ma 100A RCD, and quoted a trip time of 21ms.
OOI, should the rcd test function on a current meter (Megger 1552 in my case) still operate this? Do they test by putting a fault current on the earth, or create an inbalance between live/neutral in some other way?
Gavin
A tester may operate a voltage operated ELCB, but it depends on how many other parallel paths exist (the very reason they where removed from BS7671).
If you put your tester directly to the earth leading to the ELCB from the CU, and disconnected it in the CU, the ELCB should operate when tested - in theory.
There is no point in testing one anyway.......
If you put your tester directly to the earth leading to the ELCB from the CU, and disconnected it in the CU, the ELCB should operate when tested - in theory.
There is no point in testing one anyway.......
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Yes, the meter will work in the sense that a non-RCD loop test will trigger the VO ELCB.
But whether it is accurate or not, I'm not sure.
But whether it is accurate or not, I'm not sure.
thats cleared that up with the pics. but can someone tell me where it tells you that you have to remove a voltage operated elcb. i know that they dont comply with the 16th edition but a lot of other things dont either.
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