New metal 2 way unit fed from old Plastic 10 way consumer - Ok or not ?

[7029 dave]

My preference when adding additional fusebox/CU is to take from source splitting tails/ Henley block etc, jumping off main DP incomer forget that not for me. As for using a spare way to create sub circuit to a new CU not for me neither.

 

[IAmSparkytus!]

My preference when adding additional fusebox/CU is to take from source splitting tails/ Henley block etc, jumping off main DP incomer forget that not for me. As for using a spare way to create sub circuit to a new CU not for me neither.

Do you provide an isolator for each new board you add in? Or if there's already one fitted after the meter do you use this to feed the Henley blocks first which in turn feed both boards?

 

[7029 dave]

Do you provide an isolator for each new board you add in? Or if there's already one fitted after the meter do you use this to feed the Henley blocks first which in turn feed both boards?

I didnt mention isolators but yes would utilize existing (if one there or fit) on outgoing then fit my henleys so yeah only one to control the additina boards.

 

[GLENNSPARK]

Can't see any problem feeding from the top of the main switch IF the main switch has sufficient capacity for the extra tails, the connection can be made without excessive copper showing and at the same time be secure, and the new tails are sized sufficient for the design load of the new board.
And the total length of the tails from the meter still doesn't exceed 3m.

You should be using phase blocks to split feeders in my book...

I've seen it before and I don't like it

 

[Deleted account]

If the meter tails to the plastic DB were 3m long and then you fed another board from the supply terminals of the main switch in the plastic board, could this been seen as having the meter tails being longer than the 3m recommendation from the DNO?

This 3 meter rule/ reg is often mentioned. There is no reg that states this.
in some cases 10 meters is perfectly acceptable in others it’s not.

 

[IAmSparkytus!]

This 3 meter rule/ reg is often mentioned. There is no reg that states this.
in some cases 10 meters is perfectly acceptable in others it’s not.

Agree there's no reg but it's often mentioned that this is stipulated by the DNO - is this not the case? This is what I've heard from other people on here but never actually heard it direct.

 

[IAmSparkytus!]

You should be using phase blocks to split feeders in my book...

I've seen it before and I don't like it

Agreed. Can't imagine the terminals would get a very good connection on two 25mm or 35mm conductors together

 

[Deleted account]

Agree there's no reg but it's often mentioned that this is stipulated by the DNO - is this not the case? This is what I've heard from other people on here but never actually heard it direct.

I also used the think the 3 meter rule applied for th3 same reason you thought. I’d heard it from various people.
I only discovered it wasn’t an actual reg when I came across an installation that had 10 meter tails. I contacted the DNO and they said they where happy with this arrangement. So I looked into it deeper and found no written stipulation.


as for original poster.
it’s fine to take a feed from a plastic CU to a metal CU.
however if tails (16mm or 25mm) are being taken out of the plastic main switches intake, I’d personally not do it.

however-
ive seen this done in industrial and was surprised when I did, but decided the main tails to both CU’s are protected by the incoming. However I’ve never seen this in domestic.
conclusion
can’t see a big issue with this, but I personally would not do it.

 

[alPudsey]

I also used the think the 3 meter rule applied for th3 same reason you thought. I’d heard it from various people.
I only discovered it wasn’t an actual reg when I came across an installation that had 10 meter tails. I contacted the DNO and they said they where happy with this arrangement. So I looked into it deeper and found no written stipulation.


as for original poster.
it’s fine to take a feed from a plastic CU to a metal CU.
however if tails (16mm or 25mm) are being taken out of the plastic main switches intake, I’d personally not do it.

however-
ive seen this done in industrial and was surprised when I did, but decided the main tails to both CU’s are protected by the incoming. However I’ve never seen this in domestic.
conclusion
can’t see a big issue with this, but I personally would not do it.

Thank you