Got an interest problem, I need to extend a feed from a UPS to a server
rack. The feed currently terminates in a 32A commando plug and appears to
be some kind of armoured cable. The load is only going to be a max of 4kW
so 2.5mm will do load wise but I'm worried that someone might reuse the
cable somewhere else and assume 32A is possible because of the plugs.
So, I plumped for 4mm flex but as I've found out it's not generally
available so have to choose between 4mm armoured or 2.5mm flex. As I
understand it the armoured sheath would have to be earthed inside the
male commando plug which doesn't seem feasible... Should I just use 2.5mm
and stick labels on the plugs? :) Or does anyone know where I can get 4mm
Ta, have rung round and after a few tries found one that sells it.
However does the following sound a bit expensive??? :)
7m 4mm 3C white flex: 16+VAT
32A commando plugs: 10.24+VAT for male, 12.75+VAT for the female?
Oh well, I guess it's a surcharge for stocking unusual items.
It also reflects high copper prices (copper is up 20%+ since the start of
the year!) and a small cutting charge too.
I'd shop around for the BS4343 connectors
look at http://www.allaboutelectrics.co.uk/index.php?doc &cid9&page=2
I would suggest that you have missed (several) points.
The OP is intending to construct a plug<>socket unfused extension lead.
He is concerned that the lead could be used later, by someone else who
wasn't aware of the cable rating.
Even without that factor - the OP is using a UPS as the supply source.
Changing the MCB on a UPS is not that easy, particularly as it may not
have one. Not that it would be a good idea. Changing the MCB feeding the
UPS is not a good idea either. If it trips, the UPS will simply take over..
I got some for my kiln from the local electrical trade counter. No
problem at all. Expensive - but I assume they don't sell much and need
to cover the cost of the reel sat on the shelf.
I must admit to preferring to put in fixed wiring infrastructure and
hard-wiring the UPS output into that, with a local socket to plug the
server into. I don't like long flexes - too easily damaged.
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