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Topic Title: Jointing Cat5e
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Created On: 11 November 2017 10:14 PM
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 11 November 2017 10:14 PM
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Nospark

Posts: 193
Joined: 05 October 2013

What suggestions do you folk have for jointing Cat5e cable for a maintenance free application? (extending it in a partition wall to move outlet position without using blanking plate at original position)
 11 November 2017 10:18 PM
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Blencathra

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Joined: 07 November 2017

Not sure if it is classed as MF, but Cat5 JB
 11 November 2017 10:33 PM
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stateit

Posts: 2672
Joined: 15 April 2005

Cat 5e core csa is 0.2mm^2

Wago connectors (221 series) connect down to 0.2mm^2.

So I imagine if you keep the twists done up in the pairs all the way to the connectors, then Wago 221s should do in their Wago JB.

Or fill a CAT 5e JB with resin so it can't come undone?

-------------------------
S George
http://www.sg-electrical.com
 11 November 2017 10:35 PM
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sparkingchip

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 11 November 2017 10:39 PM
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stateit

Posts: 2672
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Originally posted by: sparkingchip

Jelly crimp


That one passed me by just now... I carry a tub of them about in my van. Haven't needed to use them for months...

-------------------------
S George
http://www.sg-electrical.com
 11 November 2017 10:42 PM
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Nospark

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I do like Wago's, but a box with cord grip needed...
 11 November 2017 10:50 PM
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sparkingchip

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Originally posted by: Nospark

I do like Wago's, but a box with cord grip needed...


Jelly crimps inside a suitable enclosure with cord grips.

Andy B.
 11 November 2017 10:55 PM
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typiod

Posts: 498
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Originally posted by: Nospark

I do like Wago's, but a box with cord grip needed...


http://www.screwfix.com/p/debo...e-connector-box/8692h
You can remove the connectors.
 11 November 2017 10:59 PM
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Blencathra

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C5 JBs have a ty wrap slot
 11 November 2017 11:35 PM
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Fm

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Rewire to ensure data tests all pass
 11 November 2017 11:58 PM
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Nospark

Posts: 193
Joined: 05 October 2013

Thank you all.
Think I'll try Jelly Crimps in a box.
I don't have any dedicated test instrument for Cat5, so standard continuity and I.R test equipment. Any comments?
 12 November 2017 06:35 AM
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crossy

Posts: 134
Joined: 14 February 2006

You can't just splice network cable any old how and expect it to work properly.

Ideal fix, replace the cable.

If you can't replace the cable solder and heatshrink, maintaining the pair twists as best you can, an overall bit of heatshrink and you're good to go.
 12 November 2017 07:05 AM
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pal1952

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Joined: 30 October 2017

The aim is to maintain the constant impedance of the cable, so any break (including connectors) disturbs this some what. The best way, but often not possible, is to replace the .cable. The next best way is to solder and heat shrink each conductor (try to get the conductors to follow their original path/shape) separately then heat shrink over the top,. If the length of cable is short (< 20M) and the join is tidy it should be ok at up to 1 Gb.
 12 November 2017 09:12 AM
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alancapon

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Joined: 27 December 2005

I agree. The best option is to replace it. The next best is solder and crimps, keeping the twists in the pairs to their correct distance. Incidentally, if you insulation test it, you may destroy it anyway. A lot of data cables are only rated for 48V dc. Even if it doesn't short core to core, if the insulation is damaged you may change its impedance and get reflections in the transmitted data.

Regards,

Alan.
 12 November 2017 09:18 AM
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Nospark

Posts: 193
Joined: 05 October 2013

Ok. Impossible to replace, therefore has to be jointed. Must admit, solder and heat shrink was my first thought.

Same question for jointing coax?
 12 November 2017 09:57 AM
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crossy

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Yup, you can do coax the same way, it's rather less fussy too.
 12 November 2017 02:56 PM
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mapj1

Posts: 9568
Joined: 22 July 2004

Or fit a proper connector and use a back to back barrel connector, either in a box or not . Same for coax.
That said, years ago I was involved in a project where the cores of Ethernet cables were lovingly opened out and monitored with very small high frequency current clamps It is surprising/ reassuring how far from the official guidance in terms of spacing and twists per inch one can stray before it actually stops working. Long before that it starts to become a point of ingress/egress in terms of RF radiation and being either intercepted or interfered with by radio equipment.

-------------------------
regards Mike


Edited: 12 November 2017 at 03:17 PM by mapj1
 12 November 2017 03:23 PM
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Nospark

Posts: 193
Joined: 05 October 2013

This is the thing, what impact in practice would well soldered joins and a small section of a say a centimetre were they aren't twisted and shielded have..
What is a proper connector or back to back barrel?
 12 November 2017 04:07 PM
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mapj1

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Joined: 22 July 2004

Well the open section will both receive and radiate, and you are relying on being in a radio quite place, there may be intermittent dropouts if phones and walkie talkies are used nearby..
In practice unless the link is right on the edge of not working, then it will probably be fine with an inch or so unwound, but in the wrong place on a marginal link, it may not.


An example with a photo of ethernet coupler
here

coax is more complex

Ftype coupler for satellite



Belling Lee for TV antennnas



N types and BNC for some video cables





Ebay for small quantities perhaps.

-------------------------
regards Mike


Edited: 12 November 2017 at 04:18 PM by mapj1
 12 November 2017 04:41 PM
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Nospark

Posts: 193
Joined: 05 October 2013

Thanks. Helpful. Can a N or BNC types be used with TV antenna? As it has to be secure in case the cable gets tugged on.
IET » Wiring and the regulations » Jointing Cat5e

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