Will this old consumer unit pose any issues with an upcoming EICR?

[Neptune]

I've had invaluable advice from this forum in relation to EICR's and clarifying my understanding that just because the consumer unit is "old", it does not need to be replaced. Since then, I had the EICR carried out at my rental property. This went to plan.

I am now scheduling my next EICR on a separate property and this has an even older Consumer Unit but everything works and seems safe e.g. no cracked fittings or exposed cables from my pre-inspection checks.

My question: will this type of Consumer Unit be okay to produce a satisfactory EICR?

Thanks in advance.

 

[pc1966]

I think we have wandered far from the OP's questions!

So getting back to @Neptune then either a RCD or RCBO board would be a worthwhile improvement on your old rewirable fuse boards for lots of reasons, both the convenience of resetting and the additional protection offered by RCD, with the RCBO option slightly better in the event of any fault.

But the board is only one aspect of overall electrical safety:

1. Make sure all sockets are correctly wired and in good condition
2. When you have RCDs, check at least twice a year they trip on the 'test' button.
3. Inspect all of your electrical goods from time to time for signs of damage or stress to the cables, that the cables are properly clamped by the sheath in any plugs, and the plugs are not cracked/damaged or show overheating marks
4. Check the appliances have the correct fuses fitted to any plugs
5. Have appliances tested if in any doubt for soundness of earth and insulation

1 & 2 ought to be done under any EICR or board change, but you can follow up yourself with one of the better socket testers such as this:

TIS Socket Tester With Loop & RCD Check

A pocket sized checker for indicating loop impedance, socket polarity and RCD 30mA are all ok. Indication is by LED's and buzzer. An ideal unit for initial "checking out" of a 13A socket and will advise if the circuit is ok, needs attention, or needs urgent attention. An ideal product for...

www.toolstation.com

3-5 would be part of PAT testing in any rented property with landlord supplied appliances, but you can probably manage 3 & 4 yourself, and get a spark in to PAT test for 5 in any situation where you are not 100% sure the appliance (or extension lead) is good.

 

[Soi disant]

The increased costs you refer to are because of requirements to fit less commonly used types of RCBO, but those are also slowly dropping in price as they are manufactured in greater numbers.

All new technology is expensive as manufacturers need to recoup costs associated with design, development, tooling etc. As demand increases, so does competition and prices drop.

I know why it's happening, and what will make it un-happen.

My point is that it is happening, and we are getting back to the situation from the past where all-RCBO is considerably more expensive than RCCB+MCBs.

This also assumes that people need to have these types of protective devices on their installation.

https://electrical.------.org/wiring-matters/years/2019/77-september-2019/which-rcd-type/

While many people will undoubtedly embrace technology that demands this sort of protection, surely many more people are like Mavis at No. 23 and gain more than adequate protection from Type A devices?

Until Mavis buys a new WM/TD/DW with a variable-speed drive in it.

 

[pc1966]

My point is that it is happening, and we are getting back to the situation from the past where all-RCBO is considerably more expensive than RCCB+MCBs.

Or we get a TT-like situation of a type B incomer/main switch and type A RCBOs?

 

[pc1966]

Until Mavis buys a new WM/TD/DW with a variable-speed drive in it.

They won't do it for finance reasons, but the VSD should have insulation monitoring like the PV inverters do.

No ordinary person reviews/changes their CU when buying new white goods, the manufacturers should be constrained to be safe with the common RCD types in use.

 

[Soi disant]

Or we get a TT-like situation of a type B incomer/main switch and type A RCBOs?

So back to losing the entire house via one circuit problem?

 

[pc1966]

So back to losing the entire house via one circuit problem?

One pure DC problem. For most faults it is going to be AC and trip the RCBOs first.

 

[Soi disant]

They won't do it for finance reasons, but the VSD should have insulation monitoring like the PV inverters do.

Is it an insulation issue, or the fundamental nature of the electronics?

No ordinary person reviews/changes their CU when buying new white goods, the manufacturers should be constrained to be safe with the common RCD types in use.

That contraint may be impossible except via banning the use of certain technologies.

And I agree with the first part of that. I'm looking forward to asking the salesman in John Lewis what sort of RCD my new washing machine will need. ?

 

[nicebutdim]

I know why it's happening, and what will make it un-happen.

You originally stated that the decline in RCBO prices was now reversing, which is patently untrue. Comparing apples with oranges (in the form of different types of RCBO) does not make this any less incorrect. Type A RCBOs have dropped sharply in price and Type B & F are also dropping in price, albeit much more slowly due to lower demand.

 

[pc1966]

Is it an insulation issue, or the fundamental nature of the electronics?

It is always an insulation issue for RCD tripping! Sometimes the cables damaged, sometimes water in something, sometimes via a person to the Earth.

The issue with VSD, PV panels, EV batteries, etc, is they power thing with smooth(ish) DC, so when it leaks it is leaking DC and not something with enough AC component for a common RCD's transformer to sense as wrong.

What makes matters worse is the sense transformer will be some sort of ferromagnetic material and if there is enough DC its permeability drops as it reaches saturation and it becomes a less-good transformer, effectively making the RCD insensitive to the AC component as well.

 

[Soi disant]

One pure DC problem. For most faults it is going to be AC and trip the RCBOs first.

No.

The issue is not the failure of Type AC devices to trip with a DC problem. The issue is that they won't trip with any problem if there is a DC component. Which could be always present and not a fault. Just like the way that loop testers use DC to saturate the RCD coil to stop it tripping.

 

[pc1966]

No.

The issue is not the failure of Type AC devices to trip with a DC problem. The issue is that they won't trip with any problem if there is a DC component. Which could be always present and not a fault. Just like the way that loop testers use DC to saturate the RCD coil to stop it tripping.

Yes, an A/AC RCBO may not detect the DC, but if that persists for more than the 100ms or whatever for the B delay incomer then the incomer disconnects everything.

So AC-ish fault the RCBO goes and you get single circuit going off.

Sneaky DC fault not tripping the RCBO and it all goes off.

Not ideal, but at a few £100 for type B RCDs it would be an option, just like 30 years ago...

 

[Soi disant]

You originally stated that the decline in RCBO prices was now reversing, which is patently untrue.

No, what I said was the trend for all-RCBO boards to be declining in price is reversing.

Comparing apples with oranges (in the form of different types of RCBO) does not make this any less incorrect.

It isn't incorrect. If oranges cost more than apples, and your fruit bowl now needs oranges as well as apples then your fruit bowl is going to cost more.

Type A RCBOs have dropped sharply in price and Type B & F are also dropping in price, albeit much more slowly due to lower demand.

They may be dropping in price, but the requirement to put them into CUs (Type Fs anyway - I'm not sure that Type Bs would ever be needed) means that the decining price trend for all-RCBO boards has reversed. The relative cost of multiple RCBOs vs 1 RCCB and multiple MCBs is like it was with Type AC devices when RCBOs started being used.

 

[Soi disant]

The issue with VSD, PV panels, EV batteries, etc, is they power thing with smooth(ish) DC, so when it leaks it is leaking DC

But is it leaking it because of an insulation fault, or because that's just what it does when it is working as designed?

 

[Soi disant]

So AC-ish fault the RCBO goes and you get single circuit going off.

Not if that RCBO has been "blinded" by the presence of DC earth leakage.

 

[DPG]

No, what I said was the trend for all-RCBO boards to be declining in price is reversing.



It isn't incorrect. If oranges cost more than apples, and your fruit bowl now needs oranges as well as apples then your fruit bowl is going to cost more.



They may be dropping in price, but the requirement to put them into CUs (Type Fs anyway - I'm not sure that Type Bs would ever be needed) means that the decining price trend for all-RCBO boards has reversed. The relative cost of multiple RCBOs vs 1 RCCB and multiple MCBs is like it was with Type AC devices when RCBOs started being used.

I still can't work you out Soi. I reckon another two porters and I'll have you sussed though.