Cable tray overfill

[Pok3r]

Does someone have from pass experience, a good solutions to solve cable tray overfill. Client is not satisfied with the cable pulls that were done by another subcontractor and not my company its being charge for it.


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[GoldDigger]

Does someone have from pass experience, a good solutions to solve cable tray overfill. Client is not satisfied with the cable pulls that were done by another subcontractor and not my company its being charge for it.


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Obvious solution is another tray.

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[Pok3r]

Yes it sounds really simple, but when its an operation plant and wires are more than 1000’ long, just adding another tray its more difficult than what it sound like.


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[Sahib]

Any detrimental effect the client is experiencing due to overfill apart from dissatisfaction?

 

[GoldDigger]

Yes it sounds really simple, but when its an operation plant and wires are more than 1000’ long, just adding another tray its more difficult than what it sound like.


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I agree, but it is hard to think of anything better for the long run.
Adding a second "deck" to the existing trays and moving the cables as they are constructed is a possibility.
I don't think separating cables with "chairs" will work if it raises some of the cables above the height of the tray sides.
How many layers deep are the wires in the existing tray? It is hard to tell from the photograph.

 

[Julius Right]

I agree with Sahib. What is the owner complaining for? cable overheating?
cable tray too large deflection?
I have seen more overfilled cable tray and nothing was dangerous.
If the fill percentage it is not more than 40% nor mechanical neither thermal behavior of cables will be a problem[usually].
It is not in the NEC limits , of course. However if it is for a power plant you can calculate the ampacity according to IPCEA P-54-44[NEMA WC5] or directly using AMPACITY FOR CABLES IN RANDOMLY FILLED TRAY by J. Stolpe/1970
You have to consult a civil engineer in order to recalculate the supports and to supplement it if necessary. You may take the sum of overall cross section in cm^2 of all the cables multiplied by 0.3 kg/m[weight][1/3 of 9kg/dm^3] as the load.
For the cable tray mechanical parts you can see a manufacturer catalogue-for instance B-Line[Eaton] or NEMA VE-1 and VE-2.[ You may consult IEC 61537[or BS EN 61537] also.

 

[Julius Right]

Sorry.it has to be 0.3 kg/ft[[about 0.7 lbs/ft]:ashamed1:

 

[Ragin Cajun]

From my experience, those trays are fine. I have seen many, many, many really overloaded trays, even spilling over the sides - that's overloaded!
But, in spite of that, never had a cable failure. Diversity is your friend. Duplex pumps, numerous control wires, abandoned cables, etc. is on your side.

IMHO

RC