SWA banjo.

[shanky887614]

you shouldn't be using guttering or roofing bolts, should be brass, certainly not allowed in hazardous areas.

with roofing bolts they have pressed heads rather than brass bolts that are machined.

in other words every so often the heads pop off roofers when you tighten them up

 

[Engineer54]

you shouldn't be using guttering or roofing bolts, should be brass, certainly not allowed in hazardous areas.

With brass Banjos you should be using Brass or Stainless steel nuts and bolts or risk the effects of dissimilar metals on the connection, especially in high humidity/external areas, or in corrosive /semi corrosive environments etc....

 

[telectrix]

With brass Banjos you should be using Brass or Stainless steel nuts and bolts or risk the effects of dissimilar metals on the connection, especially in high humidity/external areas, or in corrosive /semi corrosive environments etc....

what about the steel nut? in this case, an earthing nut would solve the problem.

 

[Engineer54]

what about the steel nut? in this case, an earthing nut would solve the problem.

Sorry Tel, i'm not quite with you here, what steel nut are you talking about??

 

[telectrix]

the steel nut that holds the gland in place. supplied with the gland kit.

 

[Jonspark]

and then there's the issue of glanding into a mild steel enclosure

 

[Jonspark]

with roofing bolts they have pressed heads rather than brass bolts that are machined.

in other words every so often the heads pop off roofers when you tighten them up

never seen heads pop off, you must be using dodgy bolts

 

[Engineer54]

Do SWA brass glands come with galv steel locknuts in the UK then?? Ours SWA kits have always come with brass locknuts. Sounds like another UK manufacturers price cutting exercise, and not a very sound one at that!! In that case as you say, an earthing nut is the way to go.

BTW, the earthing nuts we are using are screwed, with a locking grub screw. Are these piranha earth nuts the same??

 

[Bobster]

Cheaper glands come with galv locknuts. Higher end ones still use brass locknuts.

 

[telectrix]

Do SWA brass glands come with galv steel locknuts in the UK then?? Ours SWA kits have always come with brass locknuts. Sounds like another UK manufacturers price cutting exercise, and not a very sound one at that!! In that case as you say, an earthing nut is the way to go.

BTW, the earthing nuts we are using are screwed, with a locking grub screw. Are these piranha earth nuts the same??

here:...

http://www.earthingnuts.co.uk/pdf/fitting_instructions.pdf


they also have teeth on the side that goes to the enclosure so they cut away paint for a good connection.

 

[shanky887614]

never seen heads pop off, you must be using dodgy bolts

read again im talking about pz2 head roofers

 

[Jonspark]

read again im talking about pz2 head roofers

sorry, are different from the roofing bolts i'm referring to?

 

[Engineer54]

and then there's the issue of glanding into a mild steel enclosure

Not really, so long as the the earth continuity is maintained via the flying earth lead from either the earthing nut or the banjo connection then the metal enclosure is connected via the enclosures earth bar or other earthing provision... The last time i removed the paint from a metal enclose to aid gland contact was years ago, before Banjo's were thought of. As far as i'm concerned you are doing more damage to the integrity of the enclose than anything else...

As for the SWA connection to the brass gland itself, so long as that connection is kept dry, then any detrimental effects with regard to dissimilar metals is minimal. Rarely use the shrouds supplied in the gland kits these days, they rarely fit correctly anyway. We tend to use adhesive lined heat shrink to seal the gland termination, especially on external installs and the like....

 

[telectrix]

then the metal enclosure is connected via the enclosures earth bar or other earthing provision..

had a case on a park homes site where the Zdb at 3 homes was >100ohms. fault was that there was no continuity between the metal case and the earthing bar in the enclosure into which the SWA was glanded, even though the earthing bar was bolted to the case. there was no fly lead in this case. fitted a 10mm lead and Zdb came down to <1ohm. ( PME system)

 

[Jonspark]

Not really, so long as the the earth continuity is maintained via the flying earth lead from either the earthing nut or the banjo connection then the metal enclosure is connected via the enclosures earth bar or other earthing provision... The last time i removed the paint from a metal enclose to aid gland contact was years ago, before Banjo's were thought of. As far as i'm concerned you are doing more damage to the integrity of the enclose than anything else...

As for the SWA connection to the brass gland itself, so long as that connection is kept dry, then any detrimental effects with regard to dissimilar metals is minimal. Rarely use the shrouds supplied in the gland kits these days, they rarely fit correctly anyway. We tend to use adhesive lined heat shrink to seal the gland termination, especially on external installs and the like....

sorry I meant the effect of disimilar metals of the mild steel enclosure and gland, not earthing or steel armouring issues.
The way I see it it's not much different to the use of mild steel locknuts.