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How to supply a 20A Distribution cct?

Farmboy
Sorry if this is too simplistic a question but I'm wondering what you think, given I've had conflicting views from a trade assoc tech dept and Hager tech dept.


A 65m, SP+N, 20A (estimated, but could be subject to some increase) distribution cct, fed from within a commercial setting (an osteopathy/acupuncture service provided in a converted ground floor flat), is to supply a shed/summerhouse with a couple of sockets (for a kettle and TV) and a couple of LED bulkheads (via cb's in the shed CU), sited at the end of the garden. How would you supply the distr. cct at the meter position?

- From a henley block in the existing tails:

              - Its own modular enclosure containing DIN rail mounted main switch and 20A fuse carrier.

              - A rotary handled 20A fused switch disconnector.

- From a 20A cb in the existing CU.


From the trade assoc., one said from the CU, another said it's got to have its own main sw, another said no problem with the modular encl and fuse carrier. While Hager said its got to be the rotary type, not the fuse carrier.


F
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  • 0
    Potentially this shed provides additional work space and somewhere to escape to whilst the main work space is in use.


    65 metres of 6.0 mm SWA runningall the way with a B32 MCB in dedicated CU upfront with a DP main switch supplying a three way CU in the shed with a B6 and two B16 RCBOs would be what I would use if the maths works out okay with 100 mA RCD protection added to the distribution circuit if needed using a time delayed RCD. 


    Otherwise it's probably a B20 MCB at the supply and a 4.0 mm SWA with the lights connected using a SFCU in the shed along with a couple of double sockets. If the MCB trips he'll have to walk the 65 metres to and from the supply to reset it.


    He cannot have a highly engineered job at no cost. 


    Andy
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  • 0
    Potentially this shed provides additional work space and somewhere to escape to whilst the main work space is in use.


    65 metres of 6.0 mm SWA runningall the way with a B32 MCB in dedicated CU upfront with a DP main switch supplying a three way CU in the shed with a B6 and two B16 RCBOs would be what I would use if the maths works out okay with 100 mA RCD protection added to the distribution circuit if needed using a time delayed RCD. 


    Otherwise it's probably a B20 MCB at the supply and a 4.0 mm SWA with the lights connected using a SFCU in the shed along with a couple of double sockets. If the MCB trips he'll have to walk the 65 metres to and from the supply to reset it.


    He cannot have a highly engineered job at no cost. 


    Andy
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