2 module enclosure

[marcuswareham]

I am not sure if this is acceptable?

If I am using a 2 module enclosure for 2 MCBs both fed from a MCB in the main consumer unit. Would I have to use a busbar inside the 2 module enclosure or would it be ok to have a cable link at the bottom of the MCBs.

I have heard people say this is a nono inside a C/U, but my thinking in this example is that as long as the cable is rated high enough for the MCB from to C/U then there shouldn't be a problem as overcurrent protection is provided by the MCB feeding the 2 MCBs

Thanks Marcus

 

[marcuswareham]

No offence but it looks like to me you do not have the competence to be undertaking these works.

Fair enough, as i have said i work doing temporary power systems so understand the fundimentals but not the nitty gritty of the regs when it comes to domestic, as even though they are both under bs7671 our bit bs7909 is a little different in terms of cable and distribution units

I may not be doing the work, and at the min we are just talking about the options and I am getting information over the phone

I was mainly asking if having 2 MCBs in an enclosure next to c/u would be within the regs. or does it have to be a sub c/u (like the BG one on this tread)

I will have to ask him about the cable, as it is possible he has given me the wrong information or there was a misunderstanding

 

[davesparks]

The enclosure you sent me is a plastic one, the metal version of the same thing has an earth terminal inside. Would I be able to use the plastic one, as is it only C/U that have to be metal ??
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I see what your saying, as in the cable is non-compliant, I will have to get confirmation on what is there

Yes it does have to be metal, there's no way you could suggest that is not similar equipment to a CU.

I'm not sure you do see what I'm saying.

These questions are becoming increasingly concerning that you don't have sufficient knowledge or experience to be doing these works.

 

[pc1966]

The enclosure you sent me is a plastic one, the metal version of the same thing has an earth terminal inside. Would I be able to use the plastic one, as is it only C/U that have to be metal ??

Ah, had not noticed. Would explain why it is so cheap! Here is the metal version and it says it has an earth bar:

Wylex NH ESM6 IP40 2-Module Unpopulated DIN Enclosure - Screwfix

Order online at Screwfix.com. Metal enclosure with fitted DIN rail and earth bar. Ideal for housing Wylex 2-module devices such as surge arrestors, isolator switches and RCDs. FREE next day delivery available, free collection in 1 minute.

www.screwfix.com

Edit: I see you already know it!

 

[davesparks]

Fair enough, as i have said i work doing temporary power systems so understand the fundimentals but not the nitty gritty of the regs when it comes to domestic, as even though they are both under bs7671 our bit bs7909 is a little different in terms of cable and distribution units

I do both electrical installation work and temporary systems under BS7909 and the two jobs are world's apart.

 

[marcuswareham]

The consumer unit is also behind a draw in the kitchen which to me doesn't exactly seem right to me

have to remove the draw to get to it and there is hardly any working room around it

 

[pc1966]

Increasingly it is sounding like a lot of pain for not much gain!

 

[davesparks]

The consumer unit is also behind a draw in the kitchen which to me doesn't exactly seem right to me

have to remove the draw to get to it and there is hardly any working room around it

Then that is also an issue which needs to be addressed before making additions to the installation.

 

[westward10]

Fair enough, as i have said i work doing temporary power systems so understand the fundimentals but not the nitty gritty of the regs when it comes to domestic, as even though they are both under bs7671 our bit bs7909 is a little different in terms of cable and distribution units

I may not be doing the work, and at the min we are just talking about the options and I am getting information over the phone

I was mainly asking if having 2 MCBs in an enclosure next to c/u would be within the regs. or does it have to be a sub c/u (like the BG one on this tread)

I will have to ask him about the cable, as it is possible he has given me the wrong information or there was a misunderstanding

The questions you are posing are rudimentary for a competent person and your terminology and the fact you did not question a 0.75 T&E cable suggest you should not even be considering these works it is outside the scope of your knowledge.

 

[marcuswareham]

No offence but it looks like to me you do not have the competence to be undertaking these works.
[/QUOT

Then that is also an issue which needs to be addressed before making additions to the installation.

Ha yes exactly and as pc1966 says lot of pain for no gain

The person who sold him the house was an electrician also !! haha and had just re-wired it shortly before it was sold. Good work !!
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The questions you are posing are rudimentary for a competent person and your terminology and the fact you did not question a 0.75 T&E cable suggest you should not even be considering these works it is outside the scope of your knowledge.

Thats fine, and I will not do them

Just wanted to acquire some knolage on domestic installation regs from people who do it. But I can look it up in the 18th edition book

 

[davesparks]

Just wanted to acquire some knolage on domestic installation regs from people who do it. But I can look it up in the 18th edition book

There aren't any domestic installation regs, all installations are covered by the same regulations BS7671.
Some installations have additional regulations, such as those which fall under BS7909, but they are generally just additional to BS7671, not replacements of.

 

[pc1966]

There must be more to the system though, a switch or thermostat to control the underfloor heating, so you really need to find out what is actually in use before planning how it can be sorted out.

Maybe it is properly wired from there to the CU? It never occurred to me that someone would run 0.75mm round cable direct to the CU, but obviously I don't get out enough to see what the professionals have to deal with (though the dodgy trade pictures thread has some amazing work).

But in that case you need to be asking how the extra heated area is controlled, on the same control? Or separately? If the same control, what is it rated for?