Garden Wiring

[Novice]

I'd like to wire up a few things in my garden. I was intending to put in two fountain pumps (using weatherproof switches) and a double socket to run some outdoor lights from.

My initial thought was that I could connect a junction box to the electricity supply in the garage by using a spur. Then connect three sets of armoured cable to the junction box, one for each fountain pump and one as a double socket in the shed (to use for the lights).

Could you confirm my understanding of some of the information I have got from this site.
1) I cannot spur from the garage if it is already a spur off the main house ring and I can tell this because it will only have one wire going into it rather than two.
2) I cannot connect that number of appliances up to a spur.

If (2) is correct why do the junction boxes have 3 output cable holes?

Thanks for any help you can give me.

 

[breezer]

both answers are yes. Are you refering to

you can use one of these because it only has a small total current rating unlike a socket which has to be able to supply up to 13 amps

 

[Novice]

That's great thanks. I think I should spur off from two possitions then. One to connect up the two fountains and one to connect up the double socket in the shed. I have one further question though. I've read that I should connect garden electrics up using a RCD protector. If I spur how can I protect the circuit with an RCD? The only ot connect another RCD into the socket? her RCD's that I've seen plug directly into a socket (is an RCD plugged into a socket considered a spur?)

Additional information - Our house is a new build and has an RCD as part of the fuse box.
The sockets that I'm using are MK Electric 56506 outdoor junction box http://www.diy.com/bq/product/product.jhtml?PRODID=15241&paintCatId=&CATID=82951
and Masterseal 2 socket double switched http://www.diy.com/bq/product/product.jhtml?PRODID=15201&paintCatId=&CATID=171420 and a Masterseal switch which isn't on the web site.


Thanks again.

 

[breezer]

so long as you have one that i ok