Adding an furth 63A load

[uksparks]

Hi,

What are your thoughts on adding a further 63A load to this board? It will be using 63A too, not just a few amps of it as its a for a twin car charger.




looking at it, theres a max load of the following if everything was maxed out.

L1: 126A
L2: 193A
L3: 211A

I need a 63A single phase supply, so my gut instinct says put it on L1, but to you feel im adding a lot of extra load to the board? I know its not a huge amount but just wondering what your thoughts were?

Obviously taking diversity into account etc, its not over the top, its only an office. The two 63A supplies on L2 and L3 on 35 and 36 are not in use at the moment but will be shortly.



The other part of the issue is, getting armoured cable out of the wall, its got to come from about 2.5 meters up the wall, down then into the ground. I don't really know which way to tackle this as I want it to look really neat and tidy for the customer. The cable is then going into the ground outside.



I can get away with 10mm SWA to feed the charger unit, but not 100% sure the best option really to get it looking nice on the wall, then theres this bit at the bottom at juts out.

I did look at running non armoured cables to an adaptable box on the outside then glanding the SWA to that and straight down, but ideally i don't want to use an RCD / RCBO to feed it as the unit has two RCBO's built into it.

 

[uksparks]

I need to speak to them and get the full details on how much per phases bug would assume it's going to be around 22A per phase so can drop the cable down a size bug at the same time will need to possibly look at either 4 core or 5 core depending on how tight it will bend. I'll go and get a bit and see what I think.

this may possibly solve the problem in another way though.

 

[uksparks]

I could probably get away with 4mm now instead of 10mm, that's quite good really.

 

[davesparks]

You'll get it down by more than one cable size, it'll probably want a 20A TP, or maybe 32A but unless it going far 4mm should be good!

I think you can definately say you'll need 4 core, unless it's operating without a neutral!

 

[uksparks]

It's got to go about 14m so without doing the calcs 4mm should be fine, yes 5 core should do it nicely, I'll order a few bits so I can play around with it and see which I feel is best suited.

They said if I go with three phase, I can either have a three or single phase outlet, but it changes which type of lead you need so think I'll still go single phase but with with three phase supply, that way they can use the same charge leads at home too.

Once I have done it, after Christmas now due to manufacturing of the unit, I'll take photos for you to see.

 

[Plonker 3]

Why use 5 core SWA? The armourings should be more than adequate for a CPC .

 

[davesparks]

Order a few bits to ply around with?
Wtf is that all about? You calculate the cable size required and then use that size! 4 cores for TPN, 3 for TP and 2 for SP

 

[uksparks]

Order a few bits to ply around with?
Wtf is that all about? You calculate the cable size required and then use that size! 4 cores for TPN, 3 for TP and 2 for SP

All i meant was I was going to pick up a bit of 4mm 4Core to just see how much it will bend, I need to know as I will then either do that with a through gland or use an adaptable box. I know which cable i will need depending on which route I chose to go down, I would like the TPN route, but the unit may be a lot more expensive so would have to check with the customer, It may be the same, or just a trivial difference i can absorb.