Prior to RCD/ELCB what on earth (no pun) protected a TT system, especially say Spain for example where it is prevailant.
Any answers (perhaps BAS will do the honours)
Any answers (perhaps BAS will do the honours)
Pre RCD/ELCB
- Thread starter ebee
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Big_Spark
Nothing...
Not strictly true, from the early 1960's there was a device called a Fault Voltage Device and these were often installed on TT systems. During the 1970's these were slowly replaced by RCD's (ELCB's as they used to be known), the FVD's were banned from being installed by the 15th edition of the Regs, although I found one still working in an old farmhouse recently...
Other than that the only protection was good old common sense and generally a BS3036 fuseboard!!!
Not strictly true, from the early 1960's there was a device called a Fault Voltage Device and these were often installed on TT systems. During the 1970's these were slowly replaced by RCD's (ELCB's as they used to be known), the FVD's were banned from being installed by the 15th edition of the Regs, although I found one still working in an old farmhouse recently...
Other than that the only protection was good old common sense and generally a BS3036 fuseboard!!!
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You had two options. 1) Voltage operated ELCB and 2) PME (1960's version)
PME meant the neutral and earth were combined throughout the installation and all metal was connected to the earth/neutral. Ha! You never had a "borrowed neutral" problem.
In the 1960's Pyrotenax were proposing a system using their cables where the earth/neutral was the sheath. So you'd get a light fed by a single core pyro.
This was all in line with the IEE regs - 13th. edition, I think, but my memory might have failed on the edition number.
PME meant the neutral and earth were combined throughout the installation and all metal was connected to the earth/neutral. Ha! You never had a "borrowed neutral" problem.
In the 1960's Pyrotenax were proposing a system using their cables where the earth/neutral was the sheath. So you'd get a light fed by a single core pyro.
This was all in line with the IEE regs - 13th. edition, I think, but my memory might have failed on the edition number.
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Big_Spark said:
We had one on moving in four years ago (still got it somewhere) - though closer inspection showed it was bypassed and just acting as a Henley block.
Suspect, given various horrors found, that this wasn't because it wasn't working...
Neal
Or, to add to the horrors, because it was....
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ban-all-sheds said:
Exactly what I meant to say
- suspect it was working...DIYnot Local
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