I am in the UK. I want to ask for info about joining 3-core mains flex on an appliance that may have to carry up to 3,000 Watts.
I usually extend the mains flex by soldering but the finished join is too bulky when winding the flex or pulling it around a corner.
When I make my 3 joints I slightly offset each one so that it is not beside another one. This helps make a slimmer overall joint but it makes for a longer joint (about 2.5 to 3 inches) and with insulating tape it is still too bulky.
(A) Is it safe to use heat shrink insulating tubing for each join and have each join beside the other? Then I might use a single layer of insulating tape to bind over and protect the 3 joins.
(B) Or is there some widget which can help with this? Perhaps a small moulding which is made up of three very small metal tubes held by moulded plastic to be close together but not touching. I could put a wire into each end of a metal tube and then solder the wires into it. (It's just an idea.)