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

 

[topquark]

Right so its not the amps that kill then, what is it?

I suppose a mixture of environment, volts and amps!

Yes it is the current that kills but it takes only milliamps not amps.

 

[justjust1]

Yes it is the current that kills but it takes only milliamps not amps.

So, OK why then, when i accidentally touched the bus bar in my CU did i not die? Not protected by an RCD and a potential of 100A?

 

[topquark]

So, OK why then, when i accidentally touched the bus bar in my CU did i not die? Not protected by an RCD and a potential of 100A?

Probably because the path of current flow through your body did not go near your heart muscle. You were very lucky!

 

[justjust1]

Probably because the path of current flow through your body did not go near your heart muscle. You were very lucky!

Mmmm i know, guna buy some insulated gloves for when i am working in CCUs from now on!

 

[cbw]

OOOOHHHH I did the same!!!!!!

We were both lucky as hell!

Sometimes its down to what we are insulated with ie shoes, floor boards, rubber pants (Durham Sparky) Carpets and underlay.

Sometimes its down to current path ie not accross the chest

AND MOSTLY IT WAS OUR LUCKY DAY AND OUR NUMBER WAS NOT UP!!!

 

[nickblake]

Walk away mate, walk away!

No in all seriousness in this situation I WOULD be calling in the service provider to diss-connect the supply and move the customer out whilst i do a full re-wire of the entire house! Judging on the state of this i recon the rest of the wiring in the house is going to be the same!

Ker Ching!!!!

i used the pic as an example the meter of the house in the pic was changed in november 2010 a full write up is on another thread VIR a ticking time bomb hence the reason for my comments

 

[topquark]

Mmmm i know, guna buy some insulated gloves for when i am working in CCUs from now on!

Repeat after me: "Safe Isolation, Safe Isolation, ...".

 

[justjust1]

Repeat after me: "Safe Isolation, Safe Isolation, ...".

Lock off
Prove
Test
Prove
Warning Signs

 

[nickblake]

So how much current does it take to kill you ,sorry pic not right its upright every time i open it lol its me again

 

[aptsys]

Right so its not the amps that kill then, what is it?

I suppose a mixture of environment, volts and amps!

As you said, it's not just the current - you can survive a very high current shock if the duration is short enough. Technically, a specified figure of energy (in joules) delivered in a specified period of time will produce consistent mortality. Frequency will also have an effect.

 

[Electricalserv]

I read that a bloke got a shock from an exposed cable in his garage. Few days later had bad chest pains. Went docs couldnt find anything wrong after tests. When he told docs of shock they told him it was related to the shock! Don't know how true that was

 

[cbw]

That last picture should be adjusted to say 15:00

Then it would be a perfect resemblance of my colegue Shaun!!!!!



I must add thats the same picture I have somewhere! THANKYOU!

 

[netblindpaul]

justjust1,
You stated earlier in the thread that you were competent to remove the DNO fuse as I read you post.
Which DNO or electricity provider trained you in this?
Then you go on to say that you don't have the appropriate PPE.
This does not compute!
Please explain if you have the PPE or not and where you did your National Grid training?

 

[cbw]

netblindpaul, I think thats a little harsh! Yes the bloke has made a few daft comments but your post is a bit aggresive.

I pull DNO fuses and have no specific training, like most blokes on here, that kind of aggresive questioning will stop him posting/learning in the future.

I think you could have worded that better

 

[netblindpaul]

OK however, it is the truth.
Sorry I have no time for law breakers end of story.
They are undermining the trade in all areas.
The sooner this stops the better it will be for those who stick by the rules.
All this nonsense about you can't get e DNO to attend a dangerous situation is rubbish.
It is easy to do, and if they don't then they are in heap big doo doos.
If you are pulling DNO fuses without written permission of the DNO then you are a criminal Sir and I want no more to do with you.
This attitude is abhorrent.
You all cry out about the uncertified sparks taking work away, however, many seem willing to break the law to suit themselves.
DNO's are NOT above the law and are easy to work with.
You just need to understand how.
The way this forum is going I'm not sure I want to be associated with such a bunch of criminals as that is what it seems to me.