How to terminate 20mm PVC conduit into a back box/socket - preferred method, whilst maintaing IP rating ?

[JagSingh]

Hi All.

What is the best/preferred method when connecting 20mm conduit to a back box of a socket on an outside wall ?

I am connecting a BG Weatherproof Storm DP 13A socket to an outside wall, fed from socket directly behind the socket from the kitchen.

Would using a 20mm female or male adaptor with a locknut in conjuction with a sealing washer either nylon or neoprene be acceptable, eg IP rating ?

Or would using a 20mm flange coupler with sealing washer, be the only option ? I have already posted a question in regards to a PVC flange coupler, previously on the forum.



Any advice or recommendations will be kindly appreciated.

CMP 20mm M20 White Entry Thread Seal 2mm Thickness (Sold in 1's)​

• Part Code: 20ETS2
• Stock Code: 0007-0993
• To maintain the Ingress Protection rating between the equipment and the Cable Gland
• The need for a sealing washer will depend on the ingress protection rating, code of protection of the equipment and the type of entry holes available within that equipment
• The CMP metric Entry Thread Sealing Washers are produced in 2mm thick white nylon as standard which are recommended and meet the specified requirements of Shell’s Offshore operations.

Or something similar to this :

A 15mm Push Fit Tank Connector.

 

[littlespark]

Best I do is blind 20mm grommet in the hole for the cable to pass through, generously applied ring of silicone sealant around the hole, then another line of sealant around the box once it’s screwed to the wall.

The flatter the wall the better, as tightening the screws can distort the shape of the box.

 

[LeeH]

A male adapter has a larger sealing face. So use that and an IP washer of some sort.

PVC conduit systems are a bit pants though for water resistance.

 

[James]

Eventually water will get in.
always remember to drill a small (4 or 5mm) hole in the bottom of the outside socket, normally in the back of it to allow for drainage of anything that gets in.

 

[pc1966]

When possible I take in cables, etc, from the bottom as less chance of water running in. But as @James says it will get in eventually, so make sure there are small holes to let it out.

Small, as in too small for most creepy crawlies to get in!

EDIT: It it is a round cable like Flexishield, etc, than I typically use an IP68 style plastic gland.

 

[JagSingh]

When possible I take in cables, etc, from the bottom as less chance of water running in. But as @James says it will get in eventually, so make sure there are small holes to let it out.

Small, as in too small for most creepy crawlies to get in!

EDIT: It it is a round cable like Flexishield, etc, than I typically use an IP68 style plastic gland.

Hi.

Thank you for your responses.

Have you the correct name of the "round cable like Flexishield" ?

Thanks.

 

[pc1966]

Have you the correct name of the "round cable like Flexishield" ?

That is an interesting question, a web search shows nothing from the cable company now!

This is the generic stuff:

BS8436 LSZH Screened Wiring Earth Cable

Buy Online All BS8436 Screened earth wiring cables including AFUMEX, PROTEC , LSX and Guardian. 24 Hour UK Next day dispatch.

www.edwardes.co.uk

 

[davesparks]

That is an interesting question, a web search shows nothing from the cable company now!

This is the generic stuff:

BS8436 LSZH Screened Wiring Earth Cable

Buy Online All BS8436 Screened earth wiring cables including AFUMEX, PROTEC , LSX and Guardian. 24 Hour UK Next day dispatch.

www.edwardes.co.uk

FlexiShield

Multicore screened small power cables XLPE. Low smoke, Halogen free.

amokabel.com

 

[pc1966]

FlexiShield

Multicore screened small power cables XLPE. Low smoke, Halogen free.

amokabel.com

Do you know if the cable has changed at all, or is this just a corporate rebranding exercise?

 

[davesparks]

Do you know if the cable has changed at all, or is this just a corporate rebranding exercise?

The cable is the same, as far as I know it is just that Amokabel have bought out the original company.

 

[pc1966]

Have you the correct name of the "round cable like Flexishield" ?

Just to add you can get others that are round and suited to outdoor use. For example NYY-J style is like armoured cable but without the armour (so can be used with plastic glands, etc, as no need to earth the armour), it is fairly tough / stiff and suited to may locations where damage is not too likely.

Another is H07RN-F flexible cable, it is easy to work with but as fine stranded not really intended for fixed wiring, the cable ends need ferrules in most cases, and due to is flexibility it never looks as neat clipped to a wall, etc.