SWA Glands : Poor Fit

Background:

Served my apprenticeship 1964 to 1969 with NORWEB but not been directly employed in the industry since then.

I have just laid a 10mm 3 core SWA cable in a trench under the patio from the house to a detached garage 8.5m away. (cable run will be around 18m to 20m).

There won’t be much load in the garage other than lighting, sockets and an electrically operated door and possibly a router but I am making provision for a 7.2Kw Electric Vehicle Charging point, which will be a further 10m run to far corner of the garage from the garage consumer unit. I may also install more Solar panels on the garage so the supply to the garage may also at some point be a feed to the house. Battery Storage is also a consideration. There is no water feed or metal parts to the structure. Single brick construction, wooden roof beams and tiles.

My question is: As far as I can determine, there are two types of gland for use on SWA cable: indoor and outdoor.
For a belt and braces approach I’ve chosen the outdoor type even though both ends will be indoors. The recommended gland for 10mm cable is Niglon 25CW.
This gland has a compressible rubber/neoprene ring which provides the higher IP rating. However from the pictures you will see that it will never compress sufficiently to make a seal on the cable sheathing.

OD of Cable 18.9 (measured 17mm). ID of Compression ring 24mm.

I realise these glands are for a variety of cable sizes but the next smaller gland isn’t big enough for the 10mm cable and this one seems far too big.

Do I have to apply large amounts of tape around the cable sheath for the gland to compress? Or am I missing a trick?

I also have 1.5mm and 2.5mm SWA for sockets in various places around the rear garden for shrub lighting and an ultrasonic cat repeller. I currently have the internal glands (Niglon 20BW) which is a mistake as most of these will be used external. However these glands also seem too large also and I’m sure the external version will have the same problem compressing onto the sheath. I’m sure the shroud isn’t sufficient protection for an IP66 rating.

2nd Question: to conform to the new colour coding I need to sleeve the cores in Blue and green/yellow.

I have 5mm Green/yellow sleeving which will just about push onto a short piece of core but would take forever to do a long piece. I need some 6mm sleeving which doesn’t seem to be available from my normal sources.

Any suggestions?

Any advise welcome.

Ken

“The difference between genius and stupidity is, genius has its limits.”