BS number for old type of RCD

[Igor Taranenko]

Hi all, I've came across fairly old consumer unit for EICR. It looks like RCD is an old type and used as main switch.

Question 1 what is the bs number for this is rcd, 61008?

Question 2 - how would you code it in this case, rcd tested ok x1 19ms, x5 16ms. C3 as recommendation, i looks like old type voltage operated one

Thanks

 

[westward10]

BS4293 preceded en61008 and 61009.
Any chance of a pic.

 

[Vortigern]

Sorry to hijack thread, but on the same subject anyway for a bonus of 10 care to hazard a guess on these type switches?

 

[westward10]

BS5419 for the switches. The Wylex mcbs need checking on the side for their Type as B32 is a catalogue number not necessarily Type B 32A.

 

[Lucien Nunes]

It looks like RCD is an old type ... looks like old type voltage operated one

If it's voltage-operated it isn't an RCD, it's an ELCB (earth leakage circuit breaker). VOELCBs do not detect the imbalance between line and neutral like RCDs, the main earthing conductor passes through them on its way to the rod (they were normally only used on TT, and never for additional protection) so the CU earth bar does not actually connect to earth. The giveaway is the extra pair of green earth wires connected to the VOELCB.

I expect your device is an older RCD, not an ELCB, as I doubt it would respond to a normal test at all. AFAIK a BS4293 RCD is fine if a type AC BS EN 61008 would be.

 

[Igor Taranenko]

BS4293 preceded en61008 and 61009.
Any chance of a pic.

Yes, should have included earlier

 

[westward10]

Yes that is a BS4293 rcd.
At ×1 It should not exceed 200ms, at ×5 40ms.
Doesn't need Coding.

 

[telectrix]

with those MEM RCDs beware of a horrendous uplift on your Zs readings. Last one i came across added 349 Ohms .

 

[Igor Taranenko]

Thanks everyone for your input. Zs readings are fine for all circuits as well as RCD tests.

 

[Dartlec]

Yes, should have included earlier

Looks like a nice neat install (assuming there was a cover to put back on )

Yet I bet loads like this will be ripped out and metal "18th" boards thrown at the wall to 'improve' things.

with those MEM RCDs beware of a horrendous uplift on your Zs readings. Last one i came across added 349 Ohms .

Really? Useful to know. Is it MEM in general or this specific model? I could see that making me run round and doubt myself or my tester if I didn't know.

 

[Igor Taranenko]

Looks like a nice neat install (assuming there was a cover to put back on )

Yet I bet loads like this will be ripped out and metal "18th" boards thrown at the wall to 'improve' things.


Really? Useful to know. Is it MEM in general or this specific model? I could see that making me run round and doubt myself or my tester if I didn't know.

It is neat install and i don't have issues with it being plastic, no sign of thermal damage so just C3.

 

[pc1966]

Sorry to hijack thread, but on the same subject anyway for a bonus of 10 care to hazard a guess on these type switches?

Left looks like typical Wylex re-wirable CU.

Right I have never seen before. The switch has an odd metal protrusion like it should have a cover that can only be removed with the switch in the 'off' position, but there is no sign of that extending for the removable fuses - it looks only for the switch part!
[automerge]1600632491[/automerge]
Looking again, the wall behind show evidence on the paint of a much larger over-cover!

 

[Vortigern]

Looking again, the wall behind show evidence on the paint of a much larger over-cover!

Yes you are right there is a cream coloured plastic cover.

 

[westward10]

Left looks like typical Wylex re-wirable CU.

Right I have never seen before. The switch has an odd metal protrusion like it should have a cover that can only be removed with the switch in the 'off' position, but there is no sign of that extending for the removable fuses - it looks only for the switch part!
[automerge]1600632491[/automerge]
Looking again, the wall behind show evidence on the paint of a much larger over-cover!

It is an MEM board and yes the interlock is supposed to prevent it being switched on with the cover off but you just push it in with your finger and the switch will operate. Likewise the aperture for the switch toggle on the cover is sized so it can only be removed with the isolator in the off position. Look close at the toggle and it is narrower at the bottom which fits through the narrow part of the aperture, the wider top part only fits through the wider part of the aperture when it is off.
Also note the unusual rating of the main switch.

 

[Timbo]

It is an MEM board and yes the interlock is supposed to prevent it being switched on with the cover off but you just push it in with your finger and the switch will operate. Likewise the aperture for the switch toggle on the cover is sized so it can only be removed with the isolator in the off position. Look close at the toggle and it is narrower at the bottom which fits through the narrow part of the aperture, the wider top part only fits through the wider part of the aperture when it is off.
Also note the unusual rating of the main switch.

More used to seeing the grey metal version.