Changeing CCU and removing main head fuse

[justjust1]

Hi all,

I am just finishing my Level 3 City and Guilds level 3.

I am going to replace an old re-wire-able fuse type CCU with a dual RCD CCU. When replacing a CCU in the past i have just removed the main head fuse to disconnect the supply going to the CCU.

But someone at my collage has mentioned that you are supposed to contact the supplier and they will send someone out to do it? This seems a bit pointless as they will then have to re-connect after i have finished?

Can someone clarify?

Also if i can just remove the main head fuse, where would i get the wire which goes in to stop people removing the fuse? And what is it called?

Thanks

Justjust1

 

[justjust1]

Crimping (Not the type the Boosh do!)

Is this OK for the regs side, and what types of crimps are you referring to?

 

[telectrix]

oh, got you. if the existing cable/s will reach inside the CU, then extend using insulated crimps ( red for 1.5mm ) and a ratchet crimper. as they are inside the CU no need for additional insulation.

 

[richy3333]

Is this OK for the regs side

Yep, that's why I suggested it
Size of crimp will depend upon the size of cables you are joining...

 

[justjust1]

oh, got you. if the existing cable/s will reach inside the CU, then extend using insulated crimps ( red for 1.5mm ) and a ratchet crimper. as they are inside the CU no need for additional insulation.

what like these?
http://www.cablecraft.co.uk/ProductGrp/pre_insulated_butt

 

[telectrix]

eggsackly them. the pic shows red for 1.5mm, blue for 2.5mm and yellow for 4mm & 6mm cables. the ratchet crimpersd have colour coded jaws for each. crimpers from any wholesaler around £15.

 

[justjust1]

eggsackly them. the pic shows red for 1.5mm, blue for 2.5mm and yellow for 4mm & 6mm cables. the ratchet crimpersd have colour coded jaws for each. crimpers from any wholesaler around £15.

Great, and the colours have no effect on the regs either for example extending a 1.5mm blue neutral with a red connector?

 

[Electricalserv]

Great, and the colours have no effect on the regs either for example extending a 1.5mm blue neutral with a red connector?

I'd say it would have an effect. If that was the case and you used a red crimp for a neutral I'd at least tape over it in blue tape.

 

[Goody]

... The other worrying thing is that you are looking for ways around getting the DNO to isolate the supply and you have already admitted to working in a 'live' CU and getting a 'shock' - most trainees will try to follow the rules - at least for a little while.
What other corners might you be prerpared to cut?? ...

It wasn't clear that OP said he was working on live circuit but it only takes a moment of carelessness or lack of concentration for a sparky to get a shock, regardless how experienced he was.

check this out -> http://www.electriciansforums.net/e...lways-always-test-make-sure-circuit-dead.html

 

[telectrix]

I'd say it would have an effect. If that was the case and you used a red crimp for a neutral I'd at least tape over it in blue tape.

i wouldn't tape over a crimp. pointless and IMO a backward step. you'd be joining 2 blue cables ( or black if it's wired in the sensible colours ) and it is obvious to anybody that it's a neutral cable.

 

[justjust1]

i wouldn't tape over a crimp. pointless and IMO a backward step. you'd be joining 2 blue cables ( or black if it's wired in the sensible colours ) and it is obvious to anybody that it's a neutral cable.

Shame they don't do different sizes in all the colours!

 

[topquark]

i wouldn't tape over a crimp. pointless and IMO a backward step. you'd be joining 2 blue cables ( or black if it's wired in the sensible colours ) and it is obvious to anybody that it's a neutral cable.

Especially when the tape gets warm and comes unstuck, eek

 

[Paul.M]

Shame they don't do different sizes in all the colours!

Sounds like you have a business idea for Dragons Den, get yourself signed up.

 

[telectrix]

Sounds like you have a business idea for Dragons Den, get yourself signed up.

yeah, then the eurinal union will change the cable colours again , probably to match the surrender monkeys' national flag. ( is that red white and blue, or is it a white cross on a white background? )

 

[mickys86]

Here's a question

oh, got you. if the existing cable/s will reach inside the CU, then extend using insulated crimps ( red for 1.5mm ) and a ratchet crimper. as they are inside the CU no need for additional insulation.

What if the cables do not reach into the C/U?? What's the best way to do that?
I've just completed my level two 2330 and this forum is great for learning!!

P.s I am the annoying kid that has to ask 'why' and 'what If'

 

[Goody]

Here's a question



What if the cables do not reach into the C/U?? What's the best way to do that?
I've just completed my level two 2330 and this forum is great for learning!!

P.s I am the annoying kid that has to ask 'why' and 'what If'

Have a look in here-> http://www.electriciansforums.net/e...34100-cu-change-extending-circuit-wiring.html