Garden power

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Hope someone can help. At present I have a powered shed and a koi pond in the garden that are connected as follows

The shed runs off of a spur on the socket ring main and draws about 700W.
The power for the pond runs off of the cooker circuit which seems to be a radial circuit from the main consumer unit. I do not use this for the cooker and so only powers the pond. This circuit is connected via an armoured cable to a secondary consumer unit in a pump house and draws about 30A at full load (mostly due to a heater.) In effect, it has just extended the cooker radial circuit to a secondary consumer unit and the pond equipment runs off that.

I am however installing a new shed and a new cooker that will need the cooker circuit. I am therefore looking to rewire the garden. I am intending to run an independant armoured cable line from the consumer unit to feed the pond system and two sheds. My question therefore is :-

1. Do I need to run the dedicated armoured cable feed as a radial or ring main
2. Can one armoured cable feed into a secondary consumer unit that then split the power to the pond and the two sheds or should I run three circuits (either radial or ring) from the main consumer unit to the two sheds and the pond ?

Many thanks for any advice
 
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. Do I need to run the dedicated armoured cable feed as a radial or ring main
2. Can one armoured cable feed into a secondary consumer unit that then split the power to the pond and the two sheds or should I run three circuits (either radial or ring) from the main consumer unit to the two sheds and the pond ?

Radial, taking account of load and distance for size- There's a cable cal section on the TLC electrical suppliers site.

Yes, run a single cable from the existing CU or via a cut out and on the the henly block. Then have a sub mains CU (builders CU is perfect) with fuses for each circuit that you wish to provide for.

Work is notifiable under Part P :(
 
Chri5 thanks for that. Got to love part P ! Generally will electricians certify someone else's work if it's left exposed for them to see or am I being woefully optomistic ?
 
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Most are only able to self cert work they have done themselves. Me included.
Most are so busy that they cant be bothered with doing the unprofitable bits of a job and then putting their name to it. Me included!

If you are going to DIY it then notify LABC before you start and they will inspect and should test & cert it for their fee.
 

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