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derating multiple trefoils

DHRobertson

I need to determine number of cables in trefoil

2783A total

240mm2 90C (terminations OK for 130C) flexible

unbalanced so have neutrals

50% earth

2 layers of trefoils. 6 3 phase + 2 neutral + 1 earth = 27 cables (9 trefoils)

 6 sets 607 x .91 x..86 x .97?

Manufacturer says use 775 x 0.91 4sets

Please advise

Also IEC60364 has no 0.97 flexible cable de-rating factor....

Kindest regards

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    Also IEC60364 has no 0.97 flexible cable de-rating factor....

    BS 7671 does however - as I recall it's a relatively recent introduction (17th AMD1?) and accounts (I think) for different manufacturing tolerances allowed for class 5 conductors.

      - Andy.

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    Also IEC60364 has no 0.97 flexible cable de-rating factor....

    BS 7671 does however - as I recall it's a relatively recent introduction (17th AMD1?) and accounts (I think) for different manufacturing tolerances allowed for class 5 conductors.

      - Andy.

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