Mains Power on Board

[lustyd]

bootlace ferrules are insanely cheap and quick to fit, can't see why that would make anyone go broke?

 

[coopec]

Please explain what makes it dangerous, I've been wiring mains plugs and sockets that way for donkeys years without any issues.
If you have explained previously, I do apologise as I can't remember your reason.

There are two types of people in the world : the talkers and the doers. Paul is a talker.
A quote by David Della Rocco

 

[PaulRainbow]

You won't get a reply from Paul.

Paul says using domestic extension cable for the 220V power distribution in my yacht is dangerous but when I asked why I didn't get a response. FFS!

Maybe Paul should look at this?
doubling cable over for termination?

I said nothing of the sort.

 

[PaulRainbow]

I think that's a bit theoretical surely? An electrical tradesman would never do that. (He'd go broke!)

Any decent electrician would do the job properly. He won't go broke by doing so, it's part of the cost of doing the job.

 

[PaulRainbow]

Can't be bothered

 

[Dellquay13]

bootlace ferrules are insanely cheap and quick to fit, can't see why that would make anyone go broke?

Sorting out your compartment boxes of mixed up colours and sizes of ferrules make the slow January days go faster when no jobs are coming in, and stops you wasting your life away on forums…

 

[Boater Sam]

I don't go for more copper in the terminal but double back the copper along the insulation. Then when the copper and insulation is pushed into the terminal I ensure that the screw bites down on the insulation, which gives a good mechanical as well as electrical connection and helps prevent vibration loosening or fracturing the copper.

Never include the insulation under a terminal screw.
It will creep and loosen the grip and then the connection will heat, melt the insulation, get even less grip on the copper and ultimately the connection burns off.

Crimped bootlace ferrules on multi strand flex are a great idea, BUT electricians have been wiring without them for two and a half centuries.

They introduce another joint face and if not properly crimped are worse than useless.
I have never knowingly had a termination that I have done fail and I have never used a bootlace ferrule on flex unless on a cable supplied with them.

 

[PaulRainbow]

Never include the insulation under a terminal screw.
It will creep and loosen the grip and then the connection will heat, melt the insulation, get even less grip on the copper and ultimately the connection burns off.

Crimped bootlace ferrules on multi strand flex are a great idea, BUT electricians have been wiring without them for two and a half centuries.[quote/]

But they were, and still do, use solid core cable (or very few strands) that don't get chewed up by the fixing screw. Multi strand flex, such as we use on boats, always gets at least some strands chewed.

They introduce another joint face and if not properly crimped are worse than useless.
I have never knowingly had a termination that I have done fail and I have never used a bootlace ferrule on flex unless on a cable supplied with them.

It makes no sense to argue against doing something properly because it can be done badly, you could say that about anything.

 

[Alex_Blackwood]

Nothing against Bootlace ferrules . However, I think everyone is making a bit of a song and dance over this. Just consider how many are used in domestic wiring (Not the single strand). I have never used them, unless fitted, or in specifically designed connections, in 60 years of all sorts of wiring, Industrial, Marine, Domestic High and Low voltage. As for doubling over conductors, some swear by it and some don't . I was taught that it wasn't good practice but can't say I have never done it. Thinking was that the screw could settle between the u and the conductor could pull out? As for doubling back on to the insulation, Paul has covered that or was it B.S.. As for Coopec's input, in this case I will refrain from comment!

 

[Refueler]

Only time I have doubled wire into a screw connector is when wire size has been too small and no smaller screw connector. Purely to stop screw missing the wire as 'Alex' in #69 hints at.

But thats only been with low voltage RC stuff - not mains 240v

 

[LadyInBed]

Never include the insulation under a terminal screw.
It will creep and loosen the grip and then the connection will heat, melt the insulation, get even less grip on the copper and ultimately the connection burns off.

I've never seen one that I have done creep in fifty plus years, as when the screw is tightened it bites into the insulation and leaves a considerable indent. As all the copper strands are pushed against the bottom side of the terminal, only if you are using under sized wire for the job or the screw has vibrated loose will heat be generated, and as I previously said, the screw biteing into the insulation helps prevent screw vibration.
Another thing that I've seen with just stripped back copper being tightened into the terminal, is that due to incompetent workmanship, strands of copper are cut or scored along with the insulation, allowing vibration to fracture the wire and the terminal overheating. This doesn't happen if the screw is biteing into the insulation.

 

[Boater Sam]

I've never seen one that I have done creep in fifty plus years, as when the screw is tightened it bites into the insulation and leaves a considerable indent. As all the copper strands are pushed against the bottom side of the terminal, only if you are using under sized wire for the job or the screw has vibrated loose will heat be generated, and as I previously said, the screw biteing into the insulation helps prevent screw vibration.
Another thing that I've seen with just stripped back copper being tightened into the terminal, is that due to incompetent workmanship, strands of copper are cut or scored along with the insulation, allowing vibration to fracture the wire and the terminal overheating. This doesn't happen if the screw is biteing into the insulation.

You do what you want but it is very bad practice to include insulation in a termination.

 

[coopec]

Sorting out your compartment boxes of mixed up colours and sizes of ferrules make the slow January days go faster when no jobs are coming in, and stops you wasting your life away on forums…

I couldn't agree more.

A person who thinks he knows better than industry best practice is a worry.

 

[PaulRainbow]

I couldn't agree more.

A person who thinks he knows better than industry best practice is a worry.

Not as worrying as someone who doesn't even know what best practice is.