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Ttelmah
Joined: 11 Mar 2010
Posts: 19731
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 Posted: Thu Mar 09, 2017 3:10 am |
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Beware.
The connectors you are illustrating there are _not_ the IP rated version of the M12 connector. The IP rated versions have glands around the cables, not the metal cases and clamps you are showing.
They are cheap because they have no IP rating....
With what you are showing there, you will have problems almost immediately.
Get the proper 'sensor' IP rated plugs and sockets. |
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temtronic
Joined: 01 Jul 2010
Posts: 9426
Location: Greensville,Ontario
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| Posted: Thu Mar 09, 2017 6:00 am |
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re: cabling
My 'favourite' method of outdoor( and trailer) cabling uses 1/2" black 'poly' water pipe as the conduit, then fish the CAT5, 14/2, or whatever through.
While direct burial cables exist, in the garden a 'wayward' spade WILL find every cable ! Using polypipe ,you have to a very agressive spader to damage the pipe.
If you get the right 'waterproof' box, the polypipe can be attached with a fitting, then the CAT5 can be fished into the box and pushed into an RJ45.
Same for the sensor. Then you could bury the box,cable,sensor 'unit'.
Now a real clever guy would have a low current white LED on top for nighttime. A really clever guy would figure out how to solar power the 'box',use an XLP PIC and HC12 to eliminate the digging trenches ,laying conduit,running CAT5.
See THIS is how 'simple' projects snowball into huge tasks.....
Jay |
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newguy
Joined: 24 Jun 2004
Posts: 1912
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| Posted: Thu Mar 09, 2017 7:03 am |
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| temtronic wrote: | | See THIS is how 'simple' projects snowball into huge tasks..... |
It's also why commercial products never seem to keep to schedule either. Lots and lots of "oh yeah"s between product conception and rev 2 or 3 of it. |
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ELCouz
Joined: 18 Jul 2007
Posts: 427
Location: Montreal,Quebec
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| Posted: Sat Mar 11, 2017 11:07 am |
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| Ttelmah wrote: | Beware.
The connectors you are illustrating there are _not_ the IP rated version of the M12 connector. The IP rated versions have glands around the cables, not the metal cases and clamps you are showing.
They are cheap because they have no IP rating....
With what you are showing there, you will have problems almost immediately.
Get the proper 'sensor' IP rated plugs and sockets. |
Thanks for the hint. I've contacted the fleabay seller before and he said NOT waterproof but splash proof.
But looking again at your comment and the picture...something is fishy on his claim.
| Quote: |
My 'favourite' method of outdoor( and trailer) cabling uses 1/2" black 'poly' water pipe as the conduit, then fish the CAT5, 14/2, or whatever through.
While direct burial cables exist, in the garden a 'wayward' spade WILL find every cable ! Using polypipe ,you have to a very agressive spader to damage the pipe.
If you get the right 'waterproof' box, the polypipe can be attached with a fitting, then the CAT5 can be fished into the box and pushed into an RJ45.
Same for the sensor. Then you could bury the box,cable,sensor 'unit'.
Now a real clever guy would have a low current white LED on top for nighttime. A really clever guy would figure out how to solar power the 'box',use an XLP PIC and HC12 to eliminate the digging trenches ,laying conduit,running CAT5.
See THIS is how 'simple' projects snowball into huge tasks..... |
Well it's another good way to see it. Agree it's kind of fragile cable that can be cut easily if not taken care. Actually that was my last resort option if I couldn't get a cheap outdoor cable spool.
| Quote: | | It's also why commercial products never seem to keep to schedule either. Lots and lots of "oh yeah"s between product conception and rev 2 or 3 of it. |
Agree, I have a lot of ideas in my head but lack of time makes me reasonable on the "features" 
_________________
Regards,
Laurent
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Here's my first visual theme for the CCS C Compiler. Enjoy! |
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temtronic
Joined: 01 Jul 2010
Posts: 9426
Location: Greensville,Ontario
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| Posted: Sat Mar 11, 2017 12:01 pm |
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Something not pointed out yet, is the varity of 'critters' that live outdoors and LOVE to chew on exposed wires and cables......
Sorry, but I had to point it out....
Dang red squirrels are NASTY !!!
Jay |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19731
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| Posted: Sat Mar 11, 2017 3:25 pm |
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Any 'vinyl' plastic attracts this sort of thing.
Rats, grey squirrels, the American pine squirrel etc..
Because their teeth continuously grow, they have to chew to keep them worn down. Annoyingly the plasticisers commonly used in PVC, etc., tend to attract them. They even eat parts of modern cars...
On wood, the old traditional creosote, was much more effective than most of the modern wood preservatives at discouraging this. On industrial cables we use stainless braiding over the outside. The 'ratocutor' (a system I did some time ago), had a flash gun mechanism set to automatically charge, and connected to the shield around a cable. Was remarkably effective... Regular spraying with various things like cayenne pepper can discourage. Though in fact spraying with lead is more effective...  |
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newguy
Joined: 24 Jun 2004
Posts: 1912
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| Posted: Sun Mar 12, 2017 9:31 am |
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The first efforts at placing HV distribution lines underground in rural areas (in my neck of the woods, anyway), were met with outages caused by moles chewing through the lines. Mole + 25kV underground line = a lot of bother.
Wondering if you can justify the extra expense of using rather ordinary 14 AWG/3 conductor armoured BX cable? A couple sacrificial anodes buried here and there along the run should help prevent corrosion, and as long as the entry/exit points in your enclosures are properly potted, you won't have to worry about moisture. |
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