D
davesparks
It's a bit of a push to say we all install bolts and banjos, I for one haven't installed banjos on SWA for a good year now at least.
The reason I ask this is because I was picked up on it a few years ago by another sparks, the board I had installed was an MEM and after phoning them they confirmed that the complete enclosure was tested as an adequate part of the earth and no connection to the earth bar would be required and would not improve the situation
D
davesparks
Ok, if you install a banjo with a bolt then you put an earth lead to the earth terminal.
If you are going to use the metal enclosure as the earth then you don't need a banjo in the first place, you just clean it back to shiny metal where the gland will sit.
If you are going to use the metal enclosure as the earth then you don't need a banjo in the first place, you just clean it back to shiny metal where the gland will sit.
Yep, I totally agree with that, the only thing I can think that might improve the situation is if you put the banjo on then a lock nut before putting it through the enclosure, otherwise on a metal dis board it does not improve the reliability of the earth
If it's glanded Into a painted board then yes, but if I have a few SWA's to gland up, I normally install a length of 4" trunking and bond that back to the earth terminal
D
davesparks
Taking the gland plate off and replacing it with a brass one gets my vote for lots of SWAs into one DB.
Yep, never seen it done but brilliant
D
davesparks
How would the locknut help?
A paint cutting/jagged/serrated washer might help.
I prefer to use piranha nuts these days unless I have a lot of SWA terminating in the same place.
I'm just considering if it comes loose, if its tight then it should have a good connection, if its loose it won't have a good connection whether it has a banjo or not but if it had a banjo with another locknut separate to the enclosure that could help, but the spring type washer is a good idea
D
davesparks
If you fit it properly it won't come loose anyway.
G
guest119
All academic really unless you state whether the armour is the cpc as in a 2 core or a 4 core tp&n.
A 3 core used as an sp&n supply will have a core available for cpc use and the armour is then containment only.
Completely different scenarios.
Boydy.
A 3 core used as an sp&n supply will have a core available for cpc use and the armour is then containment only.
Completely different scenarios.
Boydy.
D
davesparks
In what way is it different, the armour must be connected to earth in an electrically and mechanically sound manner in both situations.
How could a tray. When the cables installed are SWA be classed as an exposed conductive part ?
Anybody ?
Anybody ?
N
nickblake
nowt wrong with them just use a nylock to stop them comming un done
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davesparks
if you are going to go to the trouble of getting nylocks to go with them, why not just get proper bolts in the first place?
Anyone 
S
Silly Sausage
It's a secondary exposed c p.
Hi archly how's that , there is no chance of it becoming live under Under fault conditions though. As the swa is already earthed. Gn8 also states this
Surely ( I know this has been done to death) that flexes
Lying over metal industrial kitchen furniture would be classed as exposed too, in this argument ( not that I agree with this )
I think the main point is, is it part of the wiring system? Tray could be considered part of the wiring system, think about earthing cabinets containing electrical equipment, this would be to ensure the cabinet does not become live in the case of a fault, similarly for tray, though I would say the likelihood is low if the cables were all SWA.
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davesparks
Guidance note 8 page 157
G
Guest77
Electricians do
Thanks Richard.
I understand what u are saying about cabinets ect, but tray using swa I see different it could only as I see inadvertently become and earthed part due to insulation coming off the swa.
I primarily work in commercial industrial environments. I have only ever see tray earthed twice. Usually I thought belts and braces attitude. Gn8 also states something along the lines of this too.
Although I read the beama guide with interest.
I understand what u are saying about cabinets ect, but tray using swa I see different it could only as I see inadvertently become and earthed part due to insulation coming off the swa.
I primarily work in commercial industrial environments. I have only ever see tray earthed twice. Usually I thought belts and braces attitude. Gn8 also states something along the lines of this too.
Although I read the beama guide with interest.
Am getting fudged up. It's me birthday. Glug glug
Happy birthday (with four minutes to go).
At least you are treating the day correctly!
arguing the ---- on the internet?
Things have gone downhill since the days of pass the parcel and sleeping lions.
Lol.
Sore head this morning though :-(
Sore head this morning though :-(
Thanks Richard
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