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Old 04-21-2016, 08:30 PM   #1
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Default Cable strain relief - extreme conditions

I've got a cable in a bit of an extreme condition, and I'm looking for a cable support for it.

It's a flexible cable, cable markings are worn off but probably h07rn-f

Problem is, it's exposed to freezing salt spray, we had ice build up on the cable about 4" thick a few months back.

Right now, it's just hanging from the cable gland, I'm surprised it didn't tear itself apart under the weight, I'm looking into strain relief options.

Does anyone have any suggestions?

I've been looking at strain relief cord grips in stainless, but I'm not confident most of them would bare the weight.

Anyone have any suggestions?
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Old 04-21-2016, 09:05 PM   #2
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How about using a Kellums grip?

https://www.google.com/search?q=kell...ih=558&dpr=1.1
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Old 04-21-2016, 09:43 PM   #3
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Thats what I was thinking. Get some Chinese finger trap!
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Old 04-21-2016, 10:08 PM   #4
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That's what I've been looking at, I figure if I can get one in stainless that would be the best option.

Should be able to fit a large stainless eyebolt to the bottom of the enclosure to hang it from.
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Old 04-21-2016, 10:20 PM   #5
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What about one like these?
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Cable strain relief - extreme conditions-forumrunner_20160421_201956.png  

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Old 04-21-2016, 10:37 PM   #6
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Do those work well for a downward pull with a significant amount of weight? I've never used one before (have seen them on control pendants, but they were oem, and really the pendants weren't that heavy)
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Old 04-21-2016, 10:40 PM   #7
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They have a tension rating in the specs when you buy them.
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Old 04-22-2016, 12:44 PM   #8
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We use Kellum grips for portable equipment quite often. Salt, Cement ect.

This type works best for us with a good anchor point, keeps the weight off the box.
Stainless steel. I don't have a part number, sorry.

Cable strain relief - extreme conditions-imageuploadedbytapatalk1461339581.385477.jpg

Cable strain relief - extreme conditions-imageuploadedbytapatalk1461339595.640875.jpg
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Old 04-22-2016, 01:21 PM   #9
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We use Kellum grips for portable equipment quite often. Salt, Cement ect.

This type works best for us with a good anchor point, keeps the weight off the box.
Stainless steel. I don't have a part number, sorry.

Attachment 77954

Attachment 77962
Looks good. I never used any Kellum's grips that had two hold points like that.
Any decent supply house can get them if you show them this picture.
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Old 04-22-2016, 01:24 PM   #10
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Quote:
Originally Posted by chrisfnl View Post
I've got a cable in a bit of an extreme condition, and I'm looking for a cable support for it.

It's a flexible cable, cable markings are worn off but probably h07rn-f

Problem is, it's exposed to freezing salt spray, we had ice build up on the cable about 4" thick a few months back.

Right now, it's just hanging from the cable gland, I'm surprised it didn't tear itself apart under the weight, I'm looking into strain relief options.

Does anyone have any suggestions?

I've been looking at strain relief cord grips in stainless, but I'm not confident most of them would bare the weight.

Anyone have any suggestions?
The mass of the ice should be easy to calculate to determine what load rating you need, but is it aboard a ship where it's subject to ocean motion and the impact loads created when the ship is in freefall coming off a wave and subject to instantaneous upward motion when the subsequent wave is pushing the ship upward? If that's the case I'd assume 3x the load you calculate with the cable and the ice for the rated strength of your grip.

If you're on land then just the mass of the ice and the cable should suffice.
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Old 04-22-2016, 02:45 PM   #11
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It's on board a ship, the mass of ice is only part of the problem, it also gets struck by strong wind and ocean waves, the effects of which multiply when the cable is covered in ice (as it's acting like a sail, creating drag) , plus as you said the upward motion of the ship.

The cable is only maybe a couple of feet long, not concerned about the weight of the cable, it's all the other conditions is exposed to.
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Old 04-22-2016, 02:51 PM   #12
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Ever seen an Adalet Sky-Tie?
They make a 160# static load model.
Not sure about stainless steel.

http://www.williamcblake.com/images/...mps_mailer.pdf

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Old 04-22-2016, 03:56 PM   #13
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Hubbell online catalog
http://ecatalog.hubbell-wiring.com/p.../V.pdf&Page=56
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Old 04-22-2016, 04:21 PM   #14
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You sure know how to pick an environment .

Being the cables need only to be a couple of feet long , and the

conditions are Brutal ...


Is there any reason that the cables can not be slieved ?

I will think like the metal slieve over oil / fuel lines on a Motor Cycle .

I will think a Stainless flexible armor attached to a Fitting needed to terminate.

A Home Built , rather than store bought , may be best .



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Old 04-22-2016, 05:32 PM   #15
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Quote:
Originally Posted by chrisfnl View Post
It's on board a ship, the mass of ice is only part of the problem, it also gets struck by strong wind and ocean waves, the effects of which multiply when the cable is covered in ice (as it's acting like a sail, creating drag) , plus as you said the upward motion of the ship.

The cable is only maybe a couple of feet long, not concerned about the weight of the cable, it's all the other conditions is exposed to.



Use those grips with anchors on each end. Lol.
I weld a small Clevis backwards to the frame using the pin through the kellums grip hehe.


Shipboard cable is usually pretty tough. Does it need to be flexible, or can you replace it with braided amour?
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Old 04-23-2016, 07:58 AM   #16
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Quote:
Originally Posted by donaldelectrician
You sure know how to pick an environment . Being the cables need only to be a couple of feet long , and the conditions are Brutal ... Is there any reason that the cables can not be slieved ? I will think like the metal slieve over oil / fuel lines on a Motor Cycle . I will think a Stainless flexible armor attached to a Fitting needed to terminate. A Home Built , rather than store bought , may be best . Don
Something like that might work, transfer the weight off the cable onto the sleeve, I'll have a look.
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Old 04-23-2016, 08:02 AM   #17
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Quote:
Originally Posted by MorePaint
Use those grips with anchors on each end. Lol. I weld a small Clevis backwards to the frame using the pin through the kellums grip hehe. Shipboard cable is usually pretty tough. Does it need to be flexible, or can you replace it with braided amour?
It's on a fire monitor on the bow, it rotates a bit between port and starboard (left and right for non-boat people)
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