transporting earths again

[gamblor6]

hi guys. long time lurker part time poster here, job has been done. tn c s earth, outside lights, roughly 30 meters from db. metallic light fittings. should these have there own spike or are they ok with the earth of the armour? im thinkink they are small caravans if you know what i mean.

 

[Sintra]

Never really heard or thought of a light fitting being compared to a caravan myself.


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[DurhamSparky]

STOP HIJACKING THREADS!!! you have posted 3x now on the same subject 2x as a thread and one as a post!

 

[Rikki Barrett]

He must be joekain?!

 

[Sparky Ninja]

So, JOEKAIN and twoway, are you one and the same then?

 

[Des 56]

Anyway back to caravans
Im lost

 

[jeremy]

JCB do something for transporting earth don't they?

 

[Sparky Ninja]

What's the problem with taking the earth from the armour? What Zs have you obtained?

 

[gamblor6]

zs was within limits. im just wondering why we cant transport tn c s to a caravan, if we look at bulkhead light fittings as small caravans, far fetched i know, is it within bs 7671 to take tn c s to them? or should i have spiked them? its a sticky subject i know. just wondering what you guys think.

 

[Sintra]

Caravans are a special location in bs 7671 and lights are not that's why.

 

[Amp David]

Do the bulkheads have a tow hitch and wheels? Is this why they are like caravans?

 

[gamblor6]

i appreciate that but are the dangers not the same?

 

[Sparky Ninja]

i appreciate that but are the dangers not the same?

What dangers are you thinking of?

 

[IQ Electrical]

The ESQCR regulations 2002 preclude a combined neutral and protective conductor being connected to any metalwork in a caravan, this is primarily because under certain fault conditions, a potential can develop between the conductive parts connected to the PME earth terminal and the general mass of earth.

I wouldn't be concerned with bulkhead fittings however lighting columns set in the ground are a whole threads' worth of debate!

 

[gamblor6]

as iq says widdler. these are not set in the ground they are fixed to the wall. im not really that bothered but know that way when jobs just bug you, lol.

 

[Sparky Ninja]

as iq says widdler. these are not set in the ground they are fixed to the wall. im not really that bothered but know that way when jobs just bug you, lol.

I would consider them to not be subject to an alternative earth potential if they are fixed to the wall, and so the armouring and RCD should suffice.

 

[Deleted member 9648]

zs was within limits. im just wondering why we cant transport tn c s to a caravan, if we look at bulkhead light fittings as small caravans, far fetched i know, is it within bs 7671 to take tn c s to them? or should i have spiked them? its a sticky subject i know. just wondering what you guys think.

Are we discussing the use of bulkheads as caravans for extremely small persons here?

 

[gamblor6]

ooompah loomphs pehaps lol someone needs to look out for them. i just cant see why the big (caravan) and the small (bulkhead light fitting) make a diferance for me the problem of 25 v or so potential diff still exists aqaaarrrrggghhhh im going to eat my own head.

 

[IQ Electrical]

ooompah loomphs pehaps lol someone needs to look out for them. i just cant see why the big (caravan) and the small (bulkhead light fitting) make a diferance for me the problem of 25 v or so potential diff still exists aqaaarrrrggghhhh im going to eat my own head.

The difference is that under an open circuit neutral fault condition, you wouldn't be inside a bulkhead light fitting (well I wouldn't be).

 

[gamblor6]

why would you have to be inside? surely the potential dif still exists between the fitting and the general mass of earth. an electricians hands may be inside the fitting also.

 

[SimpleSimon]

why would you have to be inside? surely the potential dif still exists between the fitting and the general mass of earth. an electricians hands may be inside the fitting also.

In which case it should be isolated and Definetly no potential than

 

[gamblor6]

lol fair point

 

[gaulty]

Gamblor think your putting too much thought into it, if bulkheads are suitable for outdoor use etc etc just go ahead and wire it in armour, personally I'd use 3core rather then 2 core and using the armour as an earth I'd still earth the armour but I'd have a seperate core for a direct earth. Also you can use the new earthing nuts that save u from drilling the accessories and messing with the ip integrity of the fitting!

 

[gamblor6]

cheers gaulty jobs been done, just used the armour as earth. the only times the armour is too small to be used as earth is summit like 250 mm and 300 mm lines. agreed im thinkin too much. still think the problems are the same tho, where in scotland are you gaulty?

 

[nick611]

the pme thing is just for main bonding.you dont need main bonding to a light fitting just cpc earthing.