Old 'KMF' on EICR

[seasickstevie]

How would you rate this for the supply of a 1-bedroom flat.

Cooking and heating is gas, just a 9.5kW shower, and the normal white goods in the kitchen.

But there are three flats all with the same 'KMF' setup at the mains.
It's a 60A BS-88 feeding the 17-metres of 16mm t&e riser.

Supply is 'buried in fabric of the building' with no RCD protection.

Don't know what the switch is rated at, nothing on it, or for that matter what the reference number would be.

Definitely non-compliant, but how would you code it on an EICR?

 

[ericmark]

I was looking at the DNO equipment bit, on the IET form is does say the DNO equipment should be inspected, but on the new law it says it should not.

 

[333rocky333]

What is a KMF

 

[flameport]

What is a KMF

Part number for a very old MEM switchfuse which was commonly used for supplies where the consumer unit was distant from the meter.
Modern equivalent:

How would you rate this for the supply of a 1-bedroom flat.

C2 - basic insulation outside an enclosure
C3 - no RCD for cables concealed in walls

 

[ericmark]

Electrical installation is defined in the Building Regulations as fixed electrical cables or fixed electrical equipment located on the consumer’s side of the electricity supply meter.

So not part of an EICR. So code is LIM.

 

[333rocky333]

Part number for a very old MEM switchfuse

It has Wylex stamped on it

 

[plugwash]

Where is the meter?

 

[JohnW2]

Part number for a very old MEM switchfuse which was commonly used for supplies where the consumer unit was distant from the meter. Modern equivalent: ,image.

Whilst that is true, it seems that (just like "Hoover", "Biro", "Henley Block" etc.) "KMF" has come to be used as a fairly generic term for any switch-fuse of the type you illustrate. I have several like that in my installation (none of which are MEM), and all have part numbers which include "KMF".

Kind Regards, John

 

[Adam_151]

I would suspect that switch is one of these: https://www.flameport.com/electric_museum/wylex_fuse_boxes/wylex_30a_isolator.cs4 rated at 30A

 

[JohnW2]

It has Wylex stamped on it

As I wrote ...

... I have several like that in my installation (none of which are MEM), and all have part numbers which include "KMF".

Kind Regards, John

 

[sparkwright]

View attachment 226383



Supply is 'buried in fabric of the building' with no RCD protection.

In the plaster?
In the cavity?

How deep from the surface?

 

[333rocky333]

Whilst that is true, it seems that (just like "Hoover", "Biro", "Henley Block" etc.) "KMF" has come to be used as a fairly generic term for any switch-fuse of the type you illustrate. I have several like that in my installation (none of which are MEM), and all have part numbers which include "KMF".

Kind Regards, John

I take it its "K Main Fuse", but whats the K stand for, first time i have ever heard of it, does not look big enough to have a fuse in, was it rewirable

 

[JohnW2]

I take it its "K Main Fuse", but whats the K stand for, first time i have ever heard of it, does not look big enough to have a fuse in, was it rewirable

Dunno - does the "K" perhaps stand for some German word (which seem to commonly start with that letter)?

As you say, the OP's one looks too small to contain a cartridge fuse. The modern ones I have (like the one flameport illustrated) take standard ('cutout') HRC cartridge fuses.

Kind Regards, John

 

[seasickstevie]

I would suspect that switch is one of these: https://www.flameport.com/electric_museum/wylex_fuse_boxes/wylex_30a_isolator.cs4 rated at 30A

Interesting that the rating is on the back. I'll set about taking one off the board and have a look. They are certainly bigger that the 30A switches in the link. Hopefully rated at at least 60A

 

[seasickstevie]

... does not look big enough to have a fuse in, was it rewirable

No, the switch and the fuse (in this case) are two separate entities, unlike the MEM example that flameport posted.

Hence the inverted comers around 'KMF'. Perhaps the inverted comers should have been around 'KMF setup'