Basic safe isolation question.

[newtothis]

Testing domestic consumer units.
Is a dead test actually a dead test if the fuse is not pulled or an isolator switch supplied by a DNO is not open.

Don't worry, I'm not about to mess about with this stuff unsupervised, til I'm competent.

 

[newtothis]

Fuse = main DNO fuse, which you shouldn't pull

 

[Silly Sausage]

A dead test is a test on an unenergized circuit.
So some form of isolation will be required.

 

[newtothis]

A dead test is a test on an unenergized circuit.
So some form of isolation will be required.

OK is it a dead test if the main switch in the CU and all MCBs are open.
There is a fat, live cable from the supply

 

[Pete999]

https://www.youtube.com/watch?v=kGHViQ5axKA
Have a look at this

 

[telectrix]

for dead working/testing on a circuit, you can isolate with the MCB/fuse ( locked off) or by turning off the CU main switch. working in the CU, turn off main switch . be aware that the incomer terminals are still live. always prove dead with your voltage indicator.

 

[newtothis]

Thanks Pete, Archy I've been studying the safe isolation procedure.
I'm pretty sure most of it has sunk into my thick skull

I'm asking the main live feed to the Consumer is still live.
I was getting a reading with my voltage tester telling me it was live.

 

[newtothis]

be aware that the incomer terminals are still live

Ah thanks,
I wanted to know if the results would be negatively effected, by this live cable,
and that technically I had followed the safe isolation procedure properly.

 

[D00DY_T00DY]

10 steps of safe isolatation:
1)Identify the circuit you're working on
2)Identify the supply for that circuit
3)Seek permission from appropriate person(s) to switch off the supply
4)Power down(Computers/any other electronics being run from the circuit)
5)Turn it off(via a circuit breaker etc.)
6)Lock it off with an electrician at work sign(It must be put through the padlock)
7)Prove equipment
8)Test for dead
9)Re-prove equipment
10)Barriers and signs
Must be an approved Voltage indicator and proving unit, when my tutor was going through it about half way through i'll keep saying "Test for dead" ... Was bound to be right at some point :lol:

 

[Silly Sausage]

I'm asking the main live feed to the Consumer is still live.
I was getting a reading with my voltage tester telling me it was live.

Ah, I think I get what you're getting at.
Main tails to CU are Live, Main Switch Off and locked, the CU is isolated (apart from the incoming supply).
Check the load side of the Main switch is dead and you're good to go.

 

[Simonslimline]

10 steps of safe isolatation:
1)Identify the circuit you're working on
2)Identify the supply for that circuit
3)Seek permission from appropriate person(s) to switch off the supply
4)Power down(Computers/any other electronics being run from the circuit)
5)Turn it off(via a circuit breaker etc.)
6)Lock it off with an electrician at work sign(It must be put through the padlock)
7)Prove equipment
8)Test for dead
9)Re-prove equipment
10)Barriers and signs
Must be an approved Voltage indicator and proving unit, when my tutor was going through it about half way through i'll keep saying "Test for dead" ... Was bound to be right at some point :lol:

Or a known live supply can be used.

 

[pennychew]

Or a known live supply can be used.

Such as the already mentioned live incomers

 

[D00DY_T00DY]

Or a known live supply can be used.

Ah but they insist on a GS38 approved voltage tester and proving unit... But a known live supply does the job too

 

[telectrix]

who insist? me buy a proving unit when i've got the incoming ? more chance of the pope attending synagogue.

 

[Simonslimline]

Ah but they insist on a GS38 approved voltage tester and proving unit... But a known live supply does the job too

Thats a new one to me regarding the proving unit ( i must add i do own one and do use it when needed.

Can you show me where it states this possibly mate?