2 X 10mm earths

[PC Electrics]

I've done 100's of then Sidey. It was a project management requirement in the automotive engineering arena that both Design and process FMEAs are carried out by all responsible parties.

They are a very valuable tool, but are much misunderstood by many engineers and clues are often missed. Like the risk of failure of a rubber O ring on a solid fuel booster being 1:1,000,000 !!! It was this that shifted the emphasis from only re-evaluating high RPNs to also re-evaluating high severity scores (even when the occurence was very low).

 

[Sidewinder]

Been there mate & got the T shirt!

It was Automotive where I did the bulk of mine.

 

[PC Electrics]

For those who'd like to know what we're on about:

Failure mode and effects analysis - Wikipedia, the free encyclopedia

Sidey, meet me at LL.

 

[Chr!s]

An 'Earthing Conductor' is not a 'Bonding Conductor', no matter what the 'Earthing System' is - It's an earthing conductor, and that's it....it's not 'bonding' anything.

I disagree

On a PME supply the 'Earthing Conductor' performs the function of a 'Bonding Conductor', and is required to fulfill the CSA requirements of a 'Bonding Conductor', but that doesn't make it a 'Bonding Conductor'...i.e. it would never be referred to as such.

If its not a bonding conductor then why size it as one?

A conductor running from the earth bar in a CU to the MET is a CPC - not a bonding conductor.

So if the bonding connects to the earth bar in the cu and in-turn we connect the earth bar to the met via a combined cpc bonding conductor its not a bonding conductor as well?

Bonding conductors will run from the MET to any 'Extraneous Coductive Parts' - the Earth Bar in a CU is not an 'Extraneous Conductive Part

So if i run a distribution circuit, the cpc combined with bonding, then are you saying i can not connect any bonding to the earth bar in the dis board?

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Check out the top of Page 32 in the Regs and tell me which conductor you think is the one that runs to the CU

It doesn't mention combined does that mean we cant have them

 

[springcrocus]

Nah Deke,Some will argue black is white!

I once was given a written mathematical proof that electricity did not run down cables ...

If it's AC, then it doesn't. It just stands there hopping bank and forth from one leg to the other....

 

[steptoe]

If it's AC, then it doesn't. It just stands there hopping bank and forth from one leg to the other....

what about DI ?

do they use different electricity.?

 

[springcrocus]

Like the risk of failure of a rubber O ring on a solid fuel booster being 1:1,000,000 !!! It was this that shifted the emphasis from only re-evaluating high RPNs to also re-evaluating high severity scores (even when the occurence was very low).

For people like me who nothing about it, I assume this means that if your equipment (rocket?) is worth five million quid and, with a failure rate of one in a million, it's better to spend an extra quid on an "O" ring and increase the failure rate to one in ten million rather that chance it at no extra cost?

 

[Andy™]

For people like me who nothing about it, I assume this means that if your equipment (rocket?) is worth five million quid and, with a failure rate of one in a million, it's better to spend an extra quid on an "O" ring and increase the failure rate to one in ten million rather that chance it at no extra cost?

something like that

 

[springcrocus]

what about DI ?do they use different electricity.?

Yes, of course!. It only works for five days.

 

[steptoe]

For people like me who nothing about it, I assume this means that if your equipment (rocket?) is worth five million quid and, with a failure rate of one in a million, it's better to spend an extra quid on an "O" ring and increase the failure rate to one in ten million rather that chance it at no extra cost?

yep, something like that,

we had a 10p O ring fail on us once at a bike race that cost to the tune of about

 

[Sidewinder]

Also it looks at the fact that if it fails your rocket falls out of the sky in a million pieces, killing all on board, where as if a screw comes out of the bog door in the gents down the pub, round the corner from the launch site, then all caries on, almost as normal!

 

[Evans Electric]

Well thats all very interesting ...........now where were we ...........Ah ....yes, 2 X 10mm Earth wires.

 

[Sidewinder]

Deke you LOVE a bit of OT banter...

 

[Andy™]

Was that tri-rated or ptfe ?

:slap

whats plumbers tape got to do with it?!

 

[Sidewinder]

I was thinking more like saucepans!