Sy question

[nathansinar]

Hi guys new to the forum and will introduce myself shortly 

I have attached an image of a spur i have taken as you can see from the attached image

I am doing a trainee maintenance engineer role and just wanted some info on the below.

1.) when using sy cable do you have to earth the sheeth? i have had various reponses saying it is good practice but you can get away with using the cpc inside the cable and that alone?

2.) in the image i have posted becuase the sheeth hasnt been used an earth from the the spur to what ever it is feeding, does an earth need adding from the back of the spur plate to actual spur box as it could become live?? is it a reg that this needs to be done?

Thanks for help!

Nathan

 

[Andy™]

the sheath must always be earthed at the supply end. the sheath alone is not adequate as a CPC so the g/y core must be used for that

 

[nathansinar]

How can i insert an image to  show you?

 

[apprentice87]

Ask an admin OR clock up ten posts.. Where in the midlands are you??

john..

 

[nathansinar]

Im in telford mate im trying to insert an image??? god knows how lol

Nath

 

[Risteard]

As I said to you on another forum, SY, CY and YY cables are not recognised by BS7671 as they are to VDE standards with no appropriate British Standard. They should really only be used for control wiring, and yes the correct gland must always be used.

 

[nathansinar]

im just saying what ive been told ..you can use plastic glands and not earth the braid.

Not saying its the best way by any means but i have seen lots of examples of this

 

[Risteard]

Why are you asking if you have already decided what the answer is?

 

[nathansinar]

Why are you asking if you have already decided what the answer is?

As i have said im just seeing if it can be done this way? .... nothing about it being the best

 

[Tony S]

I’ve seen lots of examples of SY in to plastic glands, that doesn’t mean it is right. The screen is there for a reason. Whether you earth the screen at both or one end depends on the application, only you know the situation.

What were you told on the dark side?

 

[nathansinar]

I’ve seen lots of examples of SY in to plastic glands, that doesn’t mean it is right. The screen is there for a reason. Whether you earth the screen at both or one end depends on the application, only you know the situation.

What were you told on the dark side?

Ive been told many ways...im only a trainee.

Some say gland the braiding, some dont its just what ive heard and seen. ive seen not earthed at all?

 

[Risteard]

What were you told on the dark side?

He was told the same thing there Tony.

 

[Evans Electric]

As said , SY cables are not recognised under 7671  , (try looking up a current rating)     .

I have to say they  certainly useful cables and have their place in the scheme of things .

All you need to do is use the SY glands where the braid can be gripped in the gland  and allow for an earth conductor in the core count.

Not much else to say really.  

 

[roys]

The Hawke 501 Universal gland is also good for SY cable as well as SWA cable because the ring that grips the armour / braid onto the cone is reversible one side having tighter clearances in order to grip the braid, hence the word Universal.

As said Earth the braid.