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Will I need 5 core swa for 3 phase? or is the armour always used for the earth?
I think you really need to get an electrician in for this work.
Discuss joining two feeds into one consumer unit. in the UK Electrical Forum area at ElectriciansForums.net
Will I need 5 core swa for 3 phase? or is the armour always used for the earth?
I agree with DPG, you obviously have sufficient funds to contemplate a 3 Phase DNO install & employ an electrician, so without any further information on demand over 3 Consumer Units including the Main Unit I think you need professional help.I have two 40A swa cables from my main house consumer unit. This consumer unit serves the whole house and the two swa cables serve two consumer units in an extension. One is upstairs and has very little demand and one is downstairs with a higher demand.
I have an Electrician ready to soon start the install before the 3 phase is connected. I am just trying to discover which solutions I can suggest & he can utilize. Sketching a several proposals will give the information of what is installed and what is required as a client.
I don't intend to do any work myself.
How will I know if it will be the best solution for me, unless I do some research.
I've 3 solar inverters to also consider integrating lol.
It is used for loads without a neutral (like your #3 case).1. 3 phases only in swa, create unacceptable eddy currents and is never used.
Thanks pc.It is used for loads without a neutral (like your #3 case).
So if you had a delta-star transformer to generate your L1-3 & N arrangement in the far building it would be acceptable, but that would cost you far more than just putting in a new cable!
You do see separate L and N cables but they are normally alluminium armour to avoid the eddy current losses (and higher fault impedance which can limit disconnection times on over current protection alone).
If you can't get enough single-phase on the existing cable then faffing about with various ways to work around it are usually a wast of time as they are either not in keeping with one or more regulation, or they end up far more expensive than the simple and obvious approach.
If you do put new cable in then put it in some twinwall duct - or two. Then you can replace it later if you need to! Also it would allow you to put in a fibre network cable as well so you have as much bandwidth as you could ask for in the future.
Each single-phase DB coming off it will need its own independent DP isolator (i.e. the normal main switch).It looks like each phase isolator will also have to isolate the neutral. I guess the neutral could be wired in series over the 3 isolators to isolate it by any switch? I expect that will be too simple.
Thanks pc.
The 3 phase supply will now be directly from the grid.
It looks like each phase isolator will also have to isolate the neutral. I guess the neutral could be wired in series over the 3 isolators to isolate it by any switch? I expect that will be too simple.
Dno booked to install 3 phase.
Can two phases enter an existing 12way split consumer unit with 2 isolators and run some from one phase and some from the other?
Or will I need two consumer units.
Yes, I have discussed various parts of the whole circuit. I'm interested to see if this is possible as it will save a lot of digging of trenches and can utilise the same cables. If I have to buy another cu for a different phase that's ok.Have you spoken with an electrician yet?
Yes, I have discussed various parts of the whole circuit. I'm interested to see if this is possible as it will save a lot of digging of trenches and can utilise the same cables. If I have to buy another cu for a different phase that's ok.
Reply to joining two feeds into one consumer unit. in the UK Electrical Forum area at ElectriciansForums.net
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