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Topic Title: lift supply
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Created On: 14 November 2012 07:54 PM
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 14 November 2012 07:54 PM
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Posts: 38
Joined: 06 May 2012

could i have thoughts regarding the following;

switched isolator fed from ryfield with 16mm tails backed up at source with 40amp bs 88-2 . then from switched isolator 1.5mm mineral 4core 3phase supply to lift room where a fused isolator is installed with 16amp motor rated fuses.

Current carrying cap = 19amps
Zs = 0.38 between phase and earth

Q1 is fault protection afforded.
Q2 is overload protection afforded.
 15 November 2012 11:22 AM
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Posts: 15838
Joined: 13 August 2003

Zs = 0.38 between phase and earth

Given the sheath of mineral insulated is pretty chunky, L-N faults are likely to be more onerous in terms of fault protection than L-PE.
What's the loop impedance L-N at the load end?

- Andy.

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