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SWA with a shroud of mystery

Sergio Fernandez

My understanding is/was that when using an SWA it needs to have a gland on each end for the armoured steel.  Normally/ideally the gland should enter the enclosure from the underside and it would normally have a shroud over the top.  If you take the standard BW or CW (other brands and types are available like Storm Glands).  

While having a discussion recently with a friend who deals with ATEX a lot he said that the shroud would be better not being fitted in a lot of situations.  Take for example a gland that is outside your dwelling where it is exposed to the elements the shroud can get condensation inside and not have a means for draining.  The gland itself is normally OK as mainly made from brass but the Amour of the SWA can start to corrode.  This can also happen is some production environment where there is moisture in the air.

I wonder what thoughts people have about this concept of no shroud for an SWA?

As always please be polite and respectful in this purely academic debate.


Come on everybody lets help inspire the future.

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  • The slip on rubber cone sort of shroud is largely like the trim on car wheels - not needed, but looks nice. There are many things that are a bit like that, but in anything but the most benign environment the gland type where there is a rubber crush ring that grips the outer jacket of the cable should be used - damp should certainly not be able to reach the galvanized armour wires, and in general I would never recommend the short gland design where the wires are exposed to view.  Even so Vaseline on mixed metal junctions and fully hot-melt glue lined heatshrink sleeves on anything that really does need some protection.

    I do a lot of antenna stuff that tends to mix the elements with expensive cables and damp is very much the enemy - there is enough gap between the wire cores for water to happily wick along doing unseen damage if it gets in at all.

    Mike

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  • The slip on rubber cone sort of shroud is largely like the trim on car wheels - not needed, but looks nice. There are many things that are a bit like that, but in anything but the most benign environment the gland type where there is a rubber crush ring that grips the outer jacket of the cable should be used - damp should certainly not be able to reach the galvanized armour wires, and in general I would never recommend the short gland design where the wires are exposed to view.  Even so Vaseline on mixed metal junctions and fully hot-melt glue lined heatshrink sleeves on anything that really does need some protection.

    I do a lot of antenna stuff that tends to mix the elements with expensive cables and damp is very much the enemy - there is enough gap between the wire cores for water to happily wick along doing unseen damage if it gets in at all.

    Mike

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