SY Cable? Thoughts?

[Spoon]

but the fact you cannot buy it in 3 core,

Just for your info mate. Eland do SY from 2 to 18 core.
https://www.elandcables.com/media/1677951/veriflex-sy-pvc-yslysy-control-cable.pdf

They do state in the spec:

 

[Darkwood]

I think there is some confusion here to what classifies as SY cable, SY is a standard pvc flex with an external braid and usually a clear jacket, other cables with a braid are not necessarily SY even if they appear to be, the proper energy cables fitted to most automation plants or many of the machines I service have very similar traits and sometimes appear to be SY but they are specialist cables that you cannot just walk into your wholesalers and pick up off the shelf.
When I buy the correct cabling for repeated flexing joints you are required to do a lengthy check list of all the environmental issues it may be subject to, the bending radii, the number of flexing actions it will undergo etc etc and you are looking at several quid a meter in comparison to a quid a meter for its equivalent SY version, the last stuff I used was from IGUS and came in at about £400+ for 2 x 15m lengths of chainflex cable 4mm 4core and a 15m 7core which is about 5 x the cost of equivalent standard SY and understandably so, it has a 10million flex lifespan and on the job I put it on it will last 10yrs plus (exposed to all outdoor temperatures, direct sunlight etc), If I used normal SY it would fail within a few yrs and end up costing more in replacement and servicing over the same period.

I did have pictures of when standard SY is used in forced flexing conditions and the results are not pretty but cannot find them, I will also put my hands up to its deliberate use myself but only as a stopgap to get a machine running while the correct cable is been shipped in.

If one understands the construction of a energy flex cable and why it is design like that and compare it to your bog standard SY then you will understand why standard SY should never be used, if you see examples in the industry of what appears to be starndard SY used in this nature then I would need to know the manufacturer and the product code to give a suitable response.

 

[LeeH]

Just for your info mate. Eland do SY from 2 to 18 core.
https://www.elandcables.com/media/1677951/veriflex-sy-pvc-yslysy-control-cable.pdf

They do state in the spec:
View attachment 45625

That has a CPC in the 3 cores spoon. You should not sleeve the CPC and use it for a phase obviously.

 

[Spoon]

That has a CPC in the 3 cores spoon. You should not sleeve the CPC and use it for a phase obviously.

Obviously..
I have never done that.

 

[sparksfly]

Funny...I had to dig out/remove SY cables in a garden previously owned by an electrician...it had part turned black over time and braid was rusty ..not fit for the outdoor life.

 

[Deuce]

Funny...I had to dig out/remove SY cables in a garden previously owned by an electrician...it had part turned black over time and braid was rusty ..not fit for the outdoor life.

Maybe he took them from another place where they were not suitable and used them at home as they will do the job, and were free

 

[The_apprentice2.0]

I certainly wouldn't recommend it for external installations as I spent a chunk of last year replacing SY .... where it appeared to be UV damaged and outer sheath very brittle and cracked..... not sure on the brand as we did not complete the initial install

 

[DefyG]

A client has just purchased a portable heater (Ive not seen yet, only a photo) that was supplied with SY cable.
It was bought from a reputable British company so presumably meets BS!
The trouble is the lead is not quite long enough so have bought a marginally longer cable to replace it with.
I don't have a problem in using SY in this instance but am waiting to see how the manufacturers have earthed the braid. (Industrial 3ph [Commando] style plug to appliance).

 

[BruvDunk]

Used it all the time in the food industry a few years ago. Never had any issues.
Only issues was water ingress into the braid if the clear plastic outer got damaged from wear and tear....

Never used it on site apart from the plant room type scenarios..

 

[davesparks]

Never had any issues.
Only issues was water ingress
.

Surely these two statements are mutually exclusive?
How can you say there were never any issues then immediate after that describe an issue?

 

[BruvDunk]

Surely these two statements are mutually exclusive?
How can you say there were never any issues then immediate after that describe an issue?

Most systems will give you issues if damage has occurred!!

 

[davesparks]

Most systems will give you issues if damage has occurred!!

In most cases damage occurs as a result of poor design or inadequate protection. And the what happens after damage has occurred is also important.

 

[BruvDunk]

In most cases damage occurs as a result of poor design or inadequate protection. And the what happens after damage has occurred is also important.

Not really sure where your heading with this, SY has a place along with all other cables, methods etc

You select, design accordingly !

 

[cliffed]

It’s being used everywhere,young lads are using it for temp electrics on site,supplies to caravans.
We would never use it always Swa’s..it’s not a BS & discouraged for use in 18th,use it at your own risk assessment & peril

 

[davesparks]

Not really sure where your heading with this, SY has a place along with all other cables, methods etc

You select, design accordingly !

I'm not heading anywhere, just sharing my views on the subject.
Yes it has a place, and when it is the best cable for a particular job I will use it. However it is very often used when it is not the most suitable cable for the job, or where it is unsuitable fir the job.