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How to supply a 20A Distribution cct?

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.


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  • “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.”


    Table J1 in the OSG.

    BS 88 series and BS 1362 fuses can be used for isolation, but not for emergency or functional switching. Also if it’s a TT installation the isolator needs to be double pole, hence Hager saying you need a rotary isolator upfront of a fuse protected circuit such as this.


    Andy
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  • “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.”


    Table J1 in the OSG.

    BS 88 series and BS 1362 fuses can be used for isolation, but not for emergency or functional switching. Also if it’s a TT installation the isolator needs to be double pole, hence Hager saying you need a rotary isolator upfront of a fuse protected circuit such as this.


    Andy
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