Register to reply

Cable trays: Return Flange cable tray

by hisham.i
Tags: cable, flange, return, tray, trays
Share this thread:
hisham.i
#1
Jan5-14, 06:01 AM
P: 177
I am designing cable tray for installation, while i am looking on different types of cables trays i found that there is cable trays called "Cable trays with return flange".

So i am wondering where such type of trays is used?

Thanks,
Hisham
Phys.Org News Partner Engineering news on Phys.org
DIY glove-based tutor indicates muscle-memory potential
Tricorder XPRIZE: 10 teams advance in global competition to develop consumer-focused diagnostic device
Study shows local seismic isolation and damping methods provide optimal protection for essential computing equipment
the_emi_guy
#2
Jan5-14, 10:40 AM
P: 589
Most cable trays have return flange because this makes them several times stronger. The actual strength is a function of the cross sectional detail (which includes the flange design) and material properties. You would probably only use non-return flange in cases where loading was minimal and you wanted to save a little money.

This is really a ME question and, unless this is something really simple, you need to work with your cable tray supplier because there are potentially lots of factors you need to consider:

Maximum span length between supports, maximum permissible deflection, material, surface treatment, loading (cable, wind, snow ...).
AlephZero
#3
Jan5-14, 01:38 PM
Engineering
Sci Advisor
HW Helper
Thanks
P: 7,172
A return flange means the top edge of the flange is bent through 180 degrees, to make the flange double the thickness.

As #2 said, it makes the flange stronger. Also there are no sharp edges at the top of the flange, that might damage cables if they are pulled over the flange.

hisham.i
#4
Jan5-14, 02:00 PM
P: 177
Cable trays: Return Flange cable tray

Thanks for your helpful info.

But i don't understand how can a flange on the top of the cable tray make it stronger?
the_emi_guy
#5
Jan5-14, 07:12 PM
P: 589
If this is not intuitive to you then it may be best for you to discover this hands-on:

Get a flat, rectangular piece of material (thin sheetmetal if you have it, or even just cardboard).

See how easy it is to bend it along its long axis with no flange.

Now bend up along both long edges 90 degrees, (like a cable tray flange), and try bending it now.
AlephZero
#6
Jan5-14, 10:47 PM
Engineering
Sci Advisor
HW Helper
Thanks
P: 7,172
When you have tried the experiment in #5, think how "floppy" something like a 3 meter long section of tray would be, and how easily it could be damaged when transporting it and installing it, without flanges.
hisham.i
#7
Jan5-14, 10:51 PM
P: 177
Agreed that it will provide more strength on horizantal forces, but how it will affect the loading?

You would probably only use non-return flange in cases where loading was minimal and you wanted to save a little money.
as "the_emi_guy".

Since return flange will not provide any strength for the loading capacity.


Register to reply

Related Discussions
Cable length dynamics by adding twists to cable Classical Physics 0
Medium Voltage Cable Cable sheat integrity test Electrical Engineering 2
The influence of crossing angle on amplitude in cable to cable coupling Engineering, Comp Sci, & Technology Homework 3
Cable theory - calculating cable length using graphs Advanced Physics Homework 2
Tension in a cable car's cable Introductory Physics Homework 2