Swa banjo location

[gazdkw82]

I am having to redo the installation side of the AM2s as I failed the conduit.

I was thinking about the banjo on the SWA, is it meant to go on the inside or outside of the enclosure that the gland fixes too. I asked the assessor and he said he cant tell me. Seemed to me they are looking for it to be done 1 way. I personally didn't think it mattered.

Any ideas?

 

[Ian1981]

I am having to redo the installation side of the AM2s as I failed the conduit.

I was thinking about the banjo on the SWA, is it meant to go on the inside or outside of the enclosure that the gland fixes too. I asked the assessor and he said he cant tell me. Seemed to me they are looking for it to be done 1 way. I personally didn't think it mattered.

Any ideas?

If it’s a plastic enclosure located outside then it should go inside the enclosure with the banjo fixed between 2 locknuts so if the plastic deforms, then the banjo is held solidly in place.
Whether this is officially the way they want you to do it, I don’t know?
Having said that I use piranha nuts where I can.

 

[gazdkw82]

Thanks Ian,

It's not a plastic enclosure. It's a 3 phase metal distribution board. I have secured the SWA with the banjo on the outside. I'm back tomorrow and have 3 hours left so plenty of time to change it but I'm really unsure what they are looking for.

They are not going to tell me. Cant find any official guidance.

 

[Ian1981]

Thanks Ian,

It's not a plastic enclosure. It's a 3 phase metal distribution board. I have secured the SWA with the banjo on the outside. I'm back tomorrow and have 3 hours left so plenty of time to change it but I'm really unsure what they are looking for.

They are not going to tell me. Cant find any official guidance.

More chance of the banjo being damaged located on the outside perhaps rather than safely out of harms way inside the enclosure, that said I’ve put plenty on the outside during the years( metal enclosure located in dry conditions).
perhaps less damage from external influences but it’s splitting hairs really isn’t it?
There not much surface area left with the shroud on and the bolt securing the banjo.
It all boils down to manufacturers instructions.

 

[gazdkw82]

Yeh maybe your right. But I'd like to know for sure. Guess there is no way of knowing

 

[Ian1981]

Yeh maybe your right. But I'd like to know for sure. Guess there is no way of knowing

Depending on the environment I really do not see the problem with a banjo on the outside as it’s more brass to brass contact,maybe it’s just the assessors personal preference?

 

[gazdkw82]

Yeh I think you may be right Ian. But I dont know how the marking works. I mean, if they were to give a student a minor for tithe banjo being on the wrong side I'm really hope they would have some documentary backup as to why it doesnt meet standards.

You dont get any feedback on the AM2 so if you fail something, you wont know why. All you will know is that the SWA/FP/SY didn't meet the requirements.


I would imagine if you officially questioned it then you may get some more information.

 

[James]

personally I normally put them on the outside,
not sure if there is any official guidance on it.

 

[davesparks]

In reality it makes no difference but to 'correct' the banjo goes on the outside of the enclosure so that the gland is directly in contact with it.

If the banjo is inside the enclosure then it is not in good direct contact with the gland.

 

[Lister1987]

P58 of this publication (NICEIC Connections July 2010) Shows banjo located inside.

Connections July 2010

Connections July 2010

issuu.com

I would've thought inside was best practice purely from a tampering pov (i.e you need to get inside the enclosure to mess with it, as opposed to it being "readily accessible" on the outside - slip down the boot etc).

 

[gazdkw82]

Well iv done it now so we will see.

I was told to use one of the completed bays as a reference bay. That bay had the gland on the outside so i did the same.

One thing i may get marked down for which I'm a little worried about is on the other side of the banjo. I used a brass nut and bolt, however I used a small steel washer because I didn't want the nut damaging the enclosure.


I fear I may get marked down for mixing dissimilar metals. Would you agree?

 

[ruston]

No . The board is a dissimilar metal too , as well as the armour.

 

[davesparks]

P58 of this publication (NICEIC Connections July 2010) Shows banjo located inside.

Connections July 2010

Connections July 2010

issuu.com

I would've thought inside was best practice purely from a tampering pov (i.e you need to get inside the enclosure to mess with it, as opposed to it being "readily accessible" on the outside - slip down the boot etc).

That image is clearly identified as being how it is done with a plastic enclosure, which is already trying to make the best of a bad situation where an earthing nut would be a much better soloution.

Whether the banjo is on the outside or the inside of a metal enclosure it is equally available for tampering as the bolt will be passing through the enclosure.
[automerge]1575500589[/automerge]

Well iv done it now so we will see.

I was told to use one of the completed bays as a reference bay. That bay had the gland on the outside so i did the same.

One thing i may get marked down for which I'm a little worried about is on the other side of the banjo. I used a brass nut and bolt, however I used a small steel washer because I didn't want the nut damaging the enclosure.


I fear I may get marked down for mixing dissimilar metals. Would you agree?

Steel and brass in contact don't suffer from galvanic corrosion to any noticeable degree so there should not be any problem.

 

[gazdkw82]

Thanks all. It clearly wasnt an issue because I passed

 

[Ian1981]

Thanks all. It clearly wasnt an issue because I passed

Well done on passing