RCD RATING VS. SERVICE FUSE RATING

[Nigel]

So the OP's wholesaler was wrong with their assertion that all RCCBs will need to be 100A rated.

My example is how I used to arrange all my dual RCD boards anyway, but not installed any for a while now.

You are correct. I suppose the supplier is saying that we should assume 100A unless proven otherwise.

 

[Nigel]

What is the Reg No of the one that states Manufacturer’s info must be adhered to?

536.4.202

 

[Deleted member 26818]

532.4.202

In the words of Elvis: No such number.

 

[Nigel]

In the words of Elvis: No such number.

Apologies - now edited.

 

[Deleted member 26818]

That’s in relation to a Consumer Unit, yes?
In relation to choice of OCPD yes?

 

[Nigel]

That’s in relation to a Consumer Unit, yes?
In relation to choice of OCPD yes?

It is in relation to OCPD protection for RCCBs. Makes no reference to consumer units or otherwise. If an RCCB is installed then it needs to meet this reg.

 

[Deleted member 26818]

No, it doesn’t specify CUs, but it does make reference to the British Standard that applies to CUs and to the overall rating of the assembly, which suggests the assembly is ‘type tested’ and therefore a CU.

 

[Nigel]

No, it doesn’t specify CUs, but it does make reference to the British Standard that applies to CUs and to the overall rating of the assembly, which suggests the assembly is ‘type tested’ and therefore a CU.

BS EN 61439 is the Standard for Low-Voltage Switchgear and Controlgear.

Anyhow, where are you going with this point?

 

[Ian1981]

It also includes a BSEN 60947-3 isolator which also requires overload protection

 

[Andy78]

Just had a wholesaler email. Hager have responded to their interpretation of this by releasing dual RCD boards with 100A RCCBs.

 

[Ian1981]

Just had a wholesaler email. Hager have responded to their interpretation of this by releasing dual RCD boards with 100A RCCBs.

As the regulation requires that manufacturers instructions are to be taken into account regarding overload it stands to reason that at least with Hager , they are requiring overload protection of their rccb’s in their consumer units

 

[Ian1981]

 

[Ian1981]

 

[Deleted member 26818]

As the regulation requires that manufacturers instructions are to be taken into account regarding overload it stands to reason that at least with Hager , they are requiring overload protection of their rccb’s in their consumer units

No, this does not require the instructions to be taken account of.
This requires the instructions to be complied with.

 

[Ian1981]

No, this does not require the instructions to be taken account of.
This requires the instructions to be complied with.

Yes as in overload shall be provided

 

[Deleted member 26818]

Please note:
Taking account of Manufacture’s instructions is not the same as following, complying with or adhering to, Manufacturer’s instructions.

 

[westward10]

Can we continue this debate without resorting to pointless posts. It is an interesting point and I thought you two were on each others Christmas card lists these days

 

[happysteve]

Hager now are supplying their dual rcd boards with 2 x 100amp 30mA rccb’s which are now type A with or with out an SPD

Yep, and the prices have gone up by a staggering 64% (example used is old VML710CU to new VML910CU). I don't fit many of these (mostly all-RCBO boards) but now the price differential between a high integrity, and an all-RCBO board makes it less worth while now.

I'm impressed at the minimal price difference between boards with and without SPDs, though; e.g. difference between VML114 (14 way, main 100A main switch) and VML112SPD (12 way, 100A main switch with Type 2 SPD) is a fairly reasonable £74.95+VAT (and you also save the cost of 2 blanks ).

 

[Silly Sausage]

What problem(s) is(are) this(these) new regulation(s) addressing?

 

[SparkyChick]

What problem(s) is(are) this(these) new regulation(s) addressing?

My guess is the frequency with which boards are being installed with an under rated RCD protecting a group of circuits.

I've just been to quote a job today and it was an Ashley and Rock board with an 80A RCD protecting I would say somewhere in the region of 180A worth of MCBs.

Even allowing for some diversity as per the OSG, the five 32A MCBs come out at over 80A. Whether this calculation provides a good reflection of the true load is irrelevant, it doesn't seem right that there is the potential there for pumping 100A through an 80A rated switching device.