Dodgy trade pictures for your amusement! - 1 Million Views!

[westward10]

It isn't an RCD.

 

[Raptor0014]

It isn't an RCD.

What is it? With the test button and no other discernible markings I just assumed it was an RCD.

 

[DPG]

What is it?

VOELCB

 

[timhoward]

This is a relic. Not sure what the RCD is supposed to be protecting as not a single thing in the property that I’ve tested so far will cause it to trip at 1 or 5x . Test button works ok though.

That needs changing mate. Sent you a PM with a video about them.

 

[Raptor0014]

VOELCB

Thank you. I was wondering how I’d now test it as I believe they’re supposed to trip at 50v.

 

[DPG]

Thank you. I was wondering how I’d now test it as I believe they’re supposed to trip at 50v.

I don't think I'd worry about testing it!

 

[timhoward]

Thank you. I was wondering how I’d now test it as I believe they’re supposed to trip at 50v.

Actually irrelevant as you (or someone) will be changing it very soon. TT install?

 

[Raptor0014]

Actually irrelevant as you (or someone) will be changing it very soon. TT install?

It is indeed.

 

[Taylortwocities]

Skip is what you need for a VOELCB. Obsolete many decades ago and, mostly wont work any more.
Or the Crabtree museum, most of the VOELCBs were made by Chilton.

Actually, skip is what you need for the fuseboard too!

 

[pc1966]

As you probably have found out by now, the VOELCB was the predecessor to the RCD but worked on a totally different basis and one that is now considered quite unreliable and long overdue for replacement.

However, the twist in that particular tale is some forms of EV open-PEN detection work on the same principle of observing a CPC to true Earth voltage!

 

[Raptor0014]

Thanks for all the input.

I knew of the VOELCB but hadn’t actually seen one in the wild. At least now I know why it wasn’t tripping on a RCD test.

 

[freddo]

Thank you. I was wondering how I’d now test it as I believe they’re supposed to trip at 50v.

Here is the correct test equipment:

 

[pc1966]

Thanks for all the input.

I knew of the VOELCB but hadn’t actually seen one in the wild. At least now I know why it wasn’t tripping on a RCD test.

You are way too young to have seen them when they were your only real option for TT systems. I think the first time I saw one was mid-70s and even then it was being replaced!

 

[Taylortwocities]

Blimey, they don't make em like that any more!

 

[Raptor0014]

You are way too young to have seen them when they were your only real option for TT systems. I think the first time I saw one was mid-70s and even then it was being replaced!

I is a spring chicken at 44.

 

[timhoward]

I think this is last edition that included them?

(It seems the 15th edition doesn't list them as protection for direct contact, but they are in other bits of it with note "Residual devices are preferred")

 

[pc1966]

Come now, lets do it properly:

 

[Taylortwocities]

You must be really old. I only go back this far....

Only 1s/6d though. Bargain

 

[westward10]

ASEE became incorporated as the IIExE, merged with the IIE who merged with the IEE who became the IET.

 

[SparkySy]

Sorry @westward10 I wanted to give an informative and funny as it is both!
Earliest regs I have a copy of is the 14th edition even though I didn't start till the 16th. All very interesting stuff!!