Rear entry three phase board

[Gigsy]

Hi,

Is it OK to create a rear entry in an eight way three phase BD.

A technician friend of mine says he has never seen this done before?

 

[westward10]

Yes I don't see why not. Those red, yellow, blue and black conductors at the meter don't appear to be suitably enclosed.

 

[Gigsy]

trunking will cover the single insulated cable BTW

 

[westward10]

They are still not enclosed behind the meter.

 

[Gigsy]

does the wooden board not provide mechanical protection?

 

[cliffed]

Bit big,the cutout,regarding IPXX etc

 

[Octopus]

Bit big,the cutout,regarding IPXX etc

On the basis the board is only mounted an inch or so from the wall the IP is irrelevant ...

 

[westward10]

does the wooden board not provide mechanical protection?

I am not sure wood boarding provides suitable containment in accordance with BS7671.

 

[Gigsy]

Bit big,the cutout,regarding IPXX etc

Will either use expanding fire proof foam foam or intumescent lining

 

[Gigsy]

Personally I am usually highly resistant to having concealed cable in commercial/industrial situations as I feel it must be accessible for inspection and testing. I also wonder how you will gland the SWA you are using? As you may know at least one end of the SWA must be earthed/terminated and connected with a fly lead to earth? How do you intend to seal the gaping hole?

The SWA is terminated to a metal box just behind the wooden board and the armour is earthed

 

[Gigsy]

I am not sure wood boarding provides suitable containment in accordance with BS7671.

It does there are many threads confirming that

 

[Octopus]

The SWA is terminated to a metal box just behind the wooden board and the armour is earthed

So its inaccessible ................ not ideal

 

[JOURNEYMAN]

Why did the rear entry hole have to be butchered so big and would it not made sense to consider a fire rated material as a backing board/entry grommet such as Paxolin?

 

[Gigsy]

So its inaccessible ................ not ideal

I can cut a hole in the wood boad maybe. Thank you I will make it accessible

 

[Gigsy]

Why did the rear entry hole have to be butchered so big and would it not made sense to consider a fire rated material as a backing board/entry grommet such as Paxolin?

There is no issue with the wooden board and there is no issue with a rear entry tho. It all conforms to BS7671

 

[Gigsy]

If you look closely Mate you can see the screw holes fro a plate of some sort. A there doesn't seem to be any bonding conductors.

There is noting to bond in this building. No gas and plastic water pipes.

 

[Gigsy]

As far as I am concerned you have opted for a poor installation method and they are not suitably enclosed.

There will be no exposed cable what so ever

 

[Octopus]

I can cut a hole in the wood boad maybe. Thank you I will make it accessible

I still don't think thats acceptable unless you make it big enough to be able to use spanners to check the tightness of the SWA gland

I would have run the SWA up to the bottom of the CU and glanded it directly to it - less parts, accessible .

 

[westward10]

There will be no exposed cable what so ever

That is not the issue, you have single insulated conductors exposed to a combustible surface.

 

[plugsandsparks]

Rear entry, no problem, done it many times, also side entry. The top and bottom gland plates run out of room very fast . Does the building not have any steelwork to bond ?