In article ,
NT writes:
On Aug 29, 1:56*pm, "Dave Plowman (News)"
wrote:
In article
,
* *NT wrote:

No, those Vs mean it's a 70 deg. rated PVC/PVC cable. *What you need is
85 deg. harmonised type H07BN4-F (UK CMA code 3183TQ), 1.5 mm^2 3-core.

E.g.http://www.tlc-direct.co.uk/Products...Q3slash50.html
I've always used 2.5mm2 butyl rubber flex, its a fair bit more
capable. Not only does the flex connect to hot terminals, but it also
heats up due to current flow, both need to be taken into account.

Given 1.5mm is already more than adequate at 16amps - and the run is
usually short - I'd call that overkill.
1.5mm2 is rated at 20A when used clipped direct. That means that it
can rise from 20C to 70C with 20A load. 16A thus gives us a temp rise
of 16/20 x 50C = 40C.

Power loss is proportional to current squared (P = I**2 x R), so your
multiplier should be (16/20)**2, which gives
(16/20)**2 x 50C = 32C.

However, most rubber cables have max operating temperature 70C.
I don't have any current capacity tables on me, but they're probably
rated at a higher current rating as a result.

--
Andrew Gabriel
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