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V.O.E.L.C.B.

It dawned on me fully today while working in an old holiday chalet circa 1940s.

The man in the next chalet was trying to use his old Black and Decker 1970s car boot sourced electric drill outside on the grass. He was making a wooden clothes hanger with wood and pegs. A jolly good job too.

I had had a quick look inside his chalet as he needs some new sockets. The fuse box is an old cream coloured Wylex 6 way unit with fuse wire carriers. There is an old Crabtree V.O.E.L.C.B. installed before the fuse box.

As he worked in the garden drilling wood, it dawned on me that he had zero shock protection as he would if he had a R.C.C.B. installed.

It's strange how a picture speaks a thousand words.

Z.

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0 Zoomup over 3 years ago

Sparkingchip:

What is the tripping current of a Voltage Operated Earth Leakage Circuit Breaker?

They work like a Volt meter. If they detect a certain Voltage between earthed metalwork within an installation, and true Earth, they trip off and open their supply contacts to the load.

The applicable B.S. for V.O.E.L.C.B.s at the time was B.S. 842. It required them to operate at 24 Volts to earth with a 200 Ohm earth electrode, and at 40 Volts with a 500 Ohm earth electrode. Crabtree claimed that theirs were instantaneous in operation. I still find perfectly operational ones today, except that the earth rod may have deteriorated or earthing lead has been pruned through, as it may only have been a 2.5mm2 green insulated solid conductor. The great thing about the test button was that it confirmed not only operation of the unit, but also the effectiveness and condition of the earth rod and earthing lead (earthing conductor). They were very well made and were solid and clunky.

https://www.bing.com/videos/search?q=John+Ward+voltage+operated+earth+leakage&docid=608032099226879187&mid=D18E886DA26FA44990EBD18E886DA26FA44990EB&view=detail&FORM=VIRE

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0 Zoomup over 3 years ago

Sparkingchip:

What is the tripping current of a Voltage Operated Earth Leakage Circuit Breaker?

They work like a Volt meter. If they detect a certain Voltage between earthed metalwork within an installation, and true Earth, they trip off and open their supply contacts to the load.

The applicable B.S. for V.O.E.L.C.B.s at the time was B.S. 842. It required them to operate at 24 Volts to earth with a 200 Ohm earth electrode, and at 40 Volts with a 500 Ohm earth electrode. Crabtree claimed that theirs were instantaneous in operation. I still find perfectly operational ones today, except that the earth rod may have deteriorated or earthing lead has been pruned through, as it may only have been a 2.5mm2 green insulated solid conductor. The great thing about the test button was that it confirmed not only operation of the unit, but also the effectiveness and condition of the earth rod and earthing lead (earthing conductor). They were very well made and were solid and clunky.

https://www.bing.com/videos/search?q=John+Ward+voltage+operated+earth+leakage&docid=608032099226879187&mid=D18E886DA26FA44990EBD18E886DA26FA44990EB&view=detail&FORM=VIRE

Z.
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