Uh--- this big question was never asked. What is the application?
BTW- Doubling up the wire is a bad idea if the conductor is solid... it will likely break. Okay if stranded, but still not ideal.
The 3M Silicone impregnated in-line butt splices are ONLY good for 24-26 gauge conductors. We use them all over the audio and telephone side of the plant, but for transitioning to 16 Gauge, I think that I would recommend a solid plastic or bakelite barrier strip, especially if you're managing multiple conductors. I'm using one for my NMEA
Data breakout and distribution. High quality spade fork crimps and a Panduit crimping tool can't be beat. Then coat the whole assembly with clear silicone grease,
and then install a plastic splash guard over the barrier strip.
Again, the location of the splice and the application are the unknown variable. Your best judgment needs to be applied from there.
He's not a friend of mine (though I wish he was), but Nigel Calder has written a number of phenomenal books
for sailors on this topic, such as The Boat Owners Mechanical and Electrical Manual
. There should be a copy in everyone's ships board library. Hit up Amazon's used book listing.
Chuck- A Radio
and Ham in San Francisco
s/v The Chester P