I would not think there is a BS but a regulation to ensure you do it correctly but I am to lazy to look it up.Thought of the day. What is the BS for heat shrink sleeving over cable joints hidden or buried in walls or ceilings ?
Indeed!Applaud SmileyApplaud SmileyApplaud Smileyif its under a floor or in a wall therefore inaccessible you are going to need to provide some strain relief for the connection to be considered maintenance free. for my joints i would either use wagos in a choc box (hate chock boxes cable grips) or Ashley J803, J804 which i think are much easier to use.
Love the free with first order SF level in the first picIf it's non visual, several layers of self amalgamating tape. If visual then a couple of layers of heatshrink.For non insulated crimps I use a layer of glue lined heatshrink on each crimp before final finishing as above.
I also stagger the crimps as per pic - ensures no contact between conductors if insulation should ever shrink back and makes the joint less bulky and can use a smaller diameter of heatshrink.
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