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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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  • 0

    Another factor to note is the spacing of the cleats, this has to be designed in consideration of the cable bursting strength under fault conditions.

    Jaymack

  • 0 in reply to Jaymack

    Spacing is 2De with 300mm between ladders

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