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Very long run of LV Cabling

fiftyhertz

Hi all,

 

im looking at a project where the landlords LV cut out is approx 850 metres from the proposed tenants installation. The earthing arrangement is TT and protected by a time delayed 300ma RCD and a 63A MCCB.

 

The landlords sub main is going to be 2 x 4C 95mm2 in parallel buried in the ground to supply 20KVA worth of power. This achieved a volt drop of 1.6% which leaves 1.9% VD for lighting. From my Amtech calcs I also get about 1ka at the load Dis board (Phase fault)

 

im not worried about Earth Loop because of the RCD, but i am thinking about the adibatic of the phase conductors. If the tenant puts a long run of cabling in, this will comply from a Zs perspective, but could there be issues with the line under a phase to neutral /phase to phase fault as the cable could slowly cook under a lowish load without tripping the breaker. Is this a valid concern? Amtech isn’t throwing up any faults, but just wanted your thoughts.

 

thanks in advance

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    What red diesel ban? Are you saying that all plant, machinery, etc, and farm tractors, etc will no longer be able to be used? It is impossible. Or are you saying that road tax will be on all diesel? That is a pity, many large buildings still use red diesel for heating! This will approximately triple many costs at a stroke. Now if you want to kill farming and any road building or repair, that is exactly the way to go. This will begin to starve the population! It will also make the UK oil refineries unviable, so you will get no petrochemicals, petrol or plastics. Inflation at 1000% coming right up! The report is nonsense.
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