Main bondage

[ultinator]

Does main bonding in every circumstance always need to be under 0.05. main bonding in a house where the main water was moved has 10mm cable but resistance of 0.25 ohms!!>>

 

[telectrix]

that's how i.ve always understood it. pity david cockburn is banned. he'd have had some theory about martians, no doubt.

 

[VoltzElectrical]

why is he banned?

 

[VoltzElectrical]

for being a COCK-BURN?

 

[Jonny66]

Well It's all pretty clear then as usual, 0.05ohms is either a max resistance end to end resulting in A maximum length of 27m for 10 mm cable or its some resistance between exposed/ extraneous conductive parts or possibly something to do with 50 volt touch voltages….…I'm so glad the science is well known and tested…wow isn't it great to be an electrician where most of the time your just makin it up cos no one knows what's going on…I thought it was just me … wow we're all shi;t at it incredible…

 

[KAS1]

THAT IS A PERFECT EXPLANATION I wish everyone could understand this

This is my take on it after a phone call to a much more knowledgeable friend.

The 0.05 value is BETWEEN simultaneously accessible extraneous parts, i.e. a gas pipe and a water pipe next to each other. Take for example this was the case, but each pipe was bonded separately back to the MET. Then the two would have to cross bonded.

The figure of 0.05 is not the value that needs to be achieved from the MET to the bonded extraneous part.

 

[KAS1]

The 0.05 ohms has nothing to do with the value of the bonding conductor at all, it or any other measurement you will be able to work out the length of any size cable, so once again nothing to do with the bonding conductor max value.

 

[Jonny66]

I'm sorry I've read that and all I can think about is the poor gramma,

 

[KAS1]

Strange post????[

I'm sorry I've read that and all I can think about is the poor gramma,

 

[Guest55]

Well It's all pretty clear then as usual, 0.05ohms is either a max resistance end to end resulting in A maximum length of 27m for 10 mm cable or its some resistance between exposed/ extraneous conductive parts or possibly something to do with 50 volt touch voltages….…I'm so glad the science is well known and tested…wow isn't it great to be an electrician where most of the time your just makin it up cos no one knows what's going on…I thought it was just me … wow we're all shi;t at it incredible…

I'm sorry I've read that and all I can think about is the poor gramma,

is there a point to these tedious ramblings ?

 

[VoltzElectrical]

Sadly..no.

This thread had potential to shed some light on a poorly understood issue that a lot of people(including me) an take a lot from. I thought that my post (although I cannot take full credit from it, as I said, I had to 'phone a friend) gave all the explanation neded.

I will reiterate for clarity.

The 0.05 value is the value below which potential difference should be, between simultaneously accessible extraneous conductive parts. Example of which is a gas pipe and a water pipe next to each other. Test between the two.

Even if both are 10mm bonded individually back to MET, if the difference between the two is greater than 0.05 then they need to be bonded to each other.

The 0.05 figure is not a value to be achieved between MET and bonding point taking into account the value of resistance of the cable.

That is how I understand it, of course, I am open to other more enlightened people's wisdom.

Regards.

 

[Jonny66]

Yes there is Boff, it seems to me there is a failure to communicate, so tell me Boff what or where does the 0.05ohm come from and what is it related to?

 

[KAS1]

That is spot on, hit the nail on the head

Sadly..no.

This thread had potential to shed some light on a poorly understood issue that a lot of people(including me) an take a lot from. I thought that my post (although I cannot take full credit from it, as I said, I had to 'phone a friend) gave all the explanation neded.

I will reiterate for clarity.

The 0.05 value is the value below which potential difference should be, between simultaneously accessible extraneous conductive parts. Example of which is a gas pipe and a water pipe next to each other. Test between the two.

Even if both are 10mm bonded individually back to MET, if the difference between the two is greater than 0.05 then they need to be bonded to each other.

The 0.05 figure is not a value to be achieved between MET and bonding point taking into account the value of resistance of the cable.

That is how I understand it, of course, I am open to other more enlightened people's wisdom.

Regards.

 

[Des 56]

His higher than expected reading could even be a simple case of the cable being oxidised

 

[Jonny66]

No lost me on the spelling and gramma and of courser this enlightened wizard who knows all

 

[Guest55]

Yes there is Boff, it seems to me there is a failure to communicate, so tell me Boff what or where does the 0.05ohm come from and what is it related to?

grow up ********.

god damn swear filter lol.