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Ask The Trades › DIY Forum › Electrical Questions › What size SWA ?

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What size SWA ? (Read 5250 times)

PowerTool

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What size SWA ?
Dec 6^th, 2004, 10:00pm

For a supply to brick shed/outhouse

Planning on having garage CU,lighting circuit with 4 100W lights and 150W external on pir,ring main with 3 double sockets to run washing machine,bench grinder,router,wood lathe (although unlikely to have more than the washing machine and one other tool in use at any one time.)

Shed is about 2 metres from house - want to put wire in before getting sparky in to connect up and replace existing CU for a split-load type.

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plugwash Administrator Offline I love YaBB 1G - SP1! Posts: 1383 Total Thanks: 0 For This Post: 0 Trade: Not Specified	Re: What size SWA ? Reply #1 - Dec 6^th, 2004, 10:13pm id spec for 40A (gives you enough for a full 32A ring plus a bit extra) distance and therefore volt drop is negligable so 6mm cable should be fine i reccomend running 3 core and using a core as earth rather than relying on the armour.
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PowerTool GDPR opt-out Total Thanks: 0 For This Post: 0	Re: What size SWA ? Reply #2 - Dec 6^th, 2004, 10:22pm Thanks for that - want to do some of the work myself,and save a bit of cash And looking forward to digging a 750 mm deep channel for the 2 metre length of the run
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scotspark Trade Member Offline mmmmm it's gonna cost you!! Posts: 3074 Total Thanks: 10 For This Post: 0 scotland Scotland Gender: Trade: Electrician	Re: What size SWA ? Reply #3 - Dec 6^th, 2004, 10:24pm best dig it 2m deep for 2m run
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PowerTool GDPR opt-out Total Thanks: 10 For This Post: 0	Re: What size SWA ? Reply #4 - Dec 6^th, 2004, 10:33pm Would do,but not sure there's enough space to manouevre the JCB....
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ban-all-sheds GDPR opt-out Total Thanks: 10 For This Post: 0	Re: What size SWA ? Reply #5 - Dec 7^th, 2004, 6:46pm 2m - no chance of going overhead? A lot less work...
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Lectrician Administrator Trade Member Author Offline Ask The Trades Posts: 8814 Total Thanks: 109 For This Post: 0 Braunton, North Devon United Kingdom Gender: Trade: Electrician	Re: What size SWA ? Reply #6 - Dec 7^th, 2004, 7:27pm I would go for this new 'infra red' system - Cable-less lectrickery
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PowerTool GDPR opt-out Total Thanks: 109 For This Post: 0	Re: What size SWA ? Reply #7 - Dec 7^th, 2004, 9:37pm BAS - is overhead cable acceptable ? (assume it would have to be fastened to wire support or similar) Was under the impression it had to be buried. ???
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sparkyjonny GDPR opt-out Total Thanks: 109 For This Post: 0	Re: What size SWA ? Reply #8 - Dec 7^th, 2004, 10:10pm Car battery and an inverter, and Robert's your father's brother! lol! If it's only a 2m run, no catenary wire is required by the regs (although nice). SWA would be a good idea in case it gets damaged. 3.5m high, or 5.8m if accessible to vehicles.
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LSpark

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Re: What size SWA ?
Reply #9 - Dec 7^th, 2004, 10:12pm

[quote author=PowerTool link=1102370411/0#7 date=1102455442]BAS - is overhead cable acceptable ? (assume it would have to be fastened to wire support or similar)

Was under the impression it had to be buried. ??? [/quote]

nah, can be run on caternary wire like Jonny said, or run on cable tray, fixed to steel structure......if you had one Grin

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ban-all-sheds

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Re: What size SWA ?
Reply #10 - Dec 9^th, 2004, 10:43am

[quote author=PowerTool link=1102370411/0#7 date=1102455442]BAS - is overhead cable acceptable ? (assume it would have to be fastened to wire support or similar)

Was under the impression it had to be buried. ??? [/quote]
No - as they others said, o'head is fine, and a wire support, although not essential, would be a good idea.

Alternatively, of you could run steel conduit between the two buildings, you wouldn't need a wire, and you wouldn't need to use SWA either....

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Lectrician Administrator Trade Member Author Offline Ask The Trades Posts: 8814 Total Thanks: 109 For This Post: 0 Braunton, North Devon United Kingdom Gender: Trade: Electrician	Re: What size SWA ? Reply #11 - Dec 9^th, 2004, 5:00pm And just to confuse matters further - Split Concentric is self supporting.
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LSpark Global Moderator Trade Member Author Offline Posts: 8069 Total Thanks: 3 For This Post: 0 London, UK United Kingdom Gender: Trade: Electrician	Re: What size SWA ? Reply #12 - Dec 9^th, 2004, 8:24pm lol, like that matters since he's not likely to use that
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