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

Zoomup
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:

    The excellent quality Crabtree E-60 model V.O.E.L.C.B. has a lighting protection spark gap (discharge gap) installed internally in parallel with the trip coil.


    In the mid to late 70s, a Crabtree 100 Amp E-60 model, without overload protection,  cost approximately £8.40 plus VAT. VAT tax was half the rate it is today at 12.5 per cent.




    Thanks - actually not quite so expensive as I'd have guessed.  Using BofE's inflation calculator on £8.40, and adding today's 20% VAT, it's around £75 total.  (Historical vat appears more varied than I remember - not quite 12.5% in the late 1970s.)  Some modern RCDs from the fancier names could be that much, even without special features of what waveforms they handle. 


    I didn't remember the spark-gap, but I remember contacts for disconnecting the installation (F) terminal while pushing the test button.

     


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  • 0
    Zoomup:

    The excellent quality Crabtree E-60 model V.O.E.L.C.B. has a lighting protection spark gap (discharge gap) installed internally in parallel with the trip coil.


    In the mid to late 70s, a Crabtree 100 Amp E-60 model, without overload protection,  cost approximately £8.40 plus VAT. VAT tax was half the rate it is today at 12.5 per cent.




    Thanks - actually not quite so expensive as I'd have guessed.  Using BofE's inflation calculator on £8.40, and adding today's 20% VAT, it's around £75 total.  (Historical vat appears more varied than I remember - not quite 12.5% in the late 1970s.)  Some modern RCDs from the fancier names could be that much, even without special features of what waveforms they handle. 


    I didn't remember the spark-gap, but I remember contacts for disconnecting the installation (F) terminal while pushing the test button.

     


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