Junction box

sparkwright · 24 Nov 2014

It is a good idea to leave a TINY bit of copper showing on the wire when connecting to a JB terminal.

As you mention, it does make it easier to get more wires in.

It's handy as you put them in if the end of the copper just slightly sticks out of the end of terminal, as you KNOW it's fully in the terminal and not trapped on the insulation.

I hate the idea of using a 30 amp junction box for 1.0 mm2 conductors.

JohnW2 · 24 Nov 2014

sparkwright said:
It is a good idea to leave a TINY bit of copper showing on the wire when connecting to a JB terminal. ... As you mention, it does make it easier to get more wires in.

I think it's probably pretty essential if there are a lot of them. The insulation obviously holds the conductors significantly apart - so if there are several and one runs the insulation right up to the terminal, some extremely tight radius bends in the conductors will be created when one tightens the screw.

sparkwright said:
It's handy as you put them in if the end of the copper just slightly sticks out of the end of terminal, as you KNOW it's fully in the terminal and not trapped on the insulation.

I couldn't agree more, but have been 'told off' (which I ignore) for doing that in my time!

sparkwright said:
I hate the idea of using a 30 amp junction box for 1.0 mm2 conductors.

So do I, but you'd get a lot of them in

Kind Regards, John

sparkwright · 24 Nov 2014

I'm trying to imagine if 1.0 mm wires would 'slip the net' from a 30 amp junction box terminal.

They certainly would from a 30 amp connector block.

JohnW2 · 24 Nov 2014

sparkwright said:
I'm trying to imagine if 1.0 mm wires would 'slip the net' from a 30 amp junction box terminal. ... They certainly would from a 30 amp connector block.

In either case, I would certainly want to see each and every one of them 'coming out of the other end' (going 'right through both sides' in the case of a connector block)! Of course, a more serious problem arises if some of the conductors are of very different sizes from one another - little ones can then remain loose even when the terminal seems to be 'well tightened'!

Kind Regards, John

sparkwright · 24 Nov 2014

JohnW2 said:
sparkwright said:

I'm trying to imagine if 1.0 mm wires would 'slip the net' from a 30 amp junction box terminal. ... They certainly would from a 30 amp connector block.

Click to expand...

In either case, I would certainly want to see each and every one of them 'coming out of the other end' (going 'right through both sides' in the case of a connector block)! Of course, a more serious problem arises if some of the conductors are of very different sizes from one another - little ones can then remain loose even when the terminal seems to be 'well tightened'!

Kind Regards, John

I'm a very firm believer in doubling over the tiny wires.

OwainDIYer · 24 Nov 2014

JohnW2 said:
In either case, I would certainly want to see each and every one of them 'coming out of the other end'

taking care the sharp pointy ends of the cores don't pierce the sleeving on the earths.

ban-all-sheds · 24 Nov 2014

JohnW2 said:
That's what I usually do - but that doesn't always stop some 'popping' out for me, if there are lots of them!

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Junction box

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