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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

    And of course the loading - is the full load on 24/7 or is it much lower with occasional busts of full load ?

    Mike.

  • 0 in reply to mapj1

    Data centers so load is pretty constant at about unity P.F.

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