Re: Punchdown blocks

[Nigel Orr <nigel.orr@xxxxxxx>]

At 14:15 29/07/99 +0100, you wrote:
>For permanent wiring that will never or seldomly be altered eg
Hardwired
>Keypads and sensors then I would use a BT style connection box (Box
Conn
>301A) fitted with Krone 237 strips.

That's what I was looking at- just wanted to check it was what is used for
Ethernet too...

>The Box Conn and Krone strips are availabl from Farnell etc.

Is the price there reasonable for small quantities?  Farnell & RS are
always my first port of call, but there's usually someone _much_ cheaper if
you know where to look...

>Remember that the solid cored wire can only be flexed a few time before
it
>starts to break so you want to ensure that all your installed wire is
fixed
>firmly into place with any patching done by means of a patch panel or
>jumpers on a box conn. It also looks much neater that way. :-))

I will bring all the fixed wiring down to the Krone block, then add local
links and jumps as required- they will all be short, so easily replaced if
they 'wear out'- I don't see any reason why I will need to disconnect the
fixed house wiring.  At this stage, I won't be adding any patch panels,
until I see what I really need...

Now for the long list of questions, where you wish you had forgotten to
reply this time too ;-)

Not being a BT-trained person- are there any useful publications/hints/tips
to make it all fit in neatly and look nice at the end?  I can cope with
wiring up 80-pair audio stageboxes, but every system has different 'tricks'
which you find as you go on... I presume the labelholders clip on top of
the blocks?  I'm planning to order some "Jumper Rings 37B" as
well, to save
having ty-raps everywhere...

I also noticed (in Farnell) that "All contacts can accept two wires of
equal size", which presumably means you can have 4 wires commoned on
each
of 20 positions (10 pairs).  Is this correct?  Is it often used, or best
avoided, to have 2 wires per contact?

What is the difference between 237A (10 pair disconnection contacts and
237B) (10 pair connection contacts) (RS sell both- Farnell offer 237A in
blue or cream!)

I will basically have 4 sets of wiring- Screened HA, Screened A/V, UTP
Telephone and UTP data.  Each will need about 30 pairs.  Would 'best
practice' be to keep each in its own 301A box (plenty of room for
expansion!) or would they normally be 'doubled up'- eg Telephone and A/V in
one 301A?  I will probably go for a box each (especially at RS's prices),
but if there are any corners which should be cut, I may as well do so now!

And finally (for now), is the 2A tool in Farnell a reasonable choice?  I
would like one that can cut the wire ends or not, as required, and that
will be reasonably easy to use and last well(even though I'll 'only' reckon
on about 100-150 pairs initially)

Thanks,

Nigel
--
Nigel Orr                  Research Associate   O   ______
Underwater Acoustics Group,              o / o    \_/(
Dept of Electrical and Electronic Engineering     (_   <   _ (
University of Newcastle Upon Tyne             \______/ \(

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