[Amps] DIN - Plessey connectors

[Will Matney]

Roger,

When I worked for JH Fletchers in mechanical engineering, we never did use any connectors that I can remember. I think they did though on the main power cable where it went into the power center. We made underground roof bolting machines for coal, and down hole drills for the salt mines, etc. What they did was hard wire everything, and all the cables on the machine went through brass or bronze packing glands, where they went into explosion proof enclosures. I cant speak for the other manufacturers like Joy or Emco. I would think aluminum in that enviroment would be easily mashed up with all that goes on. About the only aluminum I remember was on the kill switches. These were a long aluminum strip like thing with an orange rubber strip attached along the long strip. The strip was mounted down to the machine. When you put pressure anywhere on that orange rubber strip, it killed the machine. I've seen those get all mashed up and distorted on rebuilds that came in. Do they allow connectors like that say on lines coming out of explosion proof enclosures now?

Best,

Will


*********** REPLY SEPARATOR  ***********

On 2/28/06 at 3:24 AM Roger Parsons wrote:

>RE: [Amps] - DIN stands for....?
>
>'Plessey' [LMF, LMG (coarse) and LMJ (fine)]
>connectors are still available from Weald Electronics
>who brought out the designs many years ago. They are
>widely used in underground coal mining, where exposed
>aluminium is not permitted (with the notable exception
>of the US!), as they are just about the only all brass
>connectors available. They are also very rugged -
>nearly miner-proof. Not sure about the cad-pass - new
>ones look the same as they always did ....
>
>Amphenol-Tuchel Electronics GMBH do a nice line in
>waterproof (IP67?) plastic connectors which are
>dramatically less expensive than their
>aerospace/military types and for many purposes just as
>good. I have a 7 way version in front of me with the
>part number T 3107 000, but not sure of suppliers.
>
>Neither of these would be very good for the back of a
>transceiver. Personally, I like DIN connectors. They
>are a little fiddly to make off, but I've never had a
>failure. As others have pointed out, there are two
>different types of 8 pin connectors, both of which are
>covered by the DIN specifications. Unfortunately, they
>_nearly_ mate, and will do so if sufficient force is
>applied!
>
>73 Roger
>VE3ZI
>
>
>Seab said:
>>Long live Cannon and Plessey connectors<
>As far as I'm aware, Plessey Connectors died a long
>time ago, some time after 
>G8LT retired as Managing Director. Not sure who GEC
>sold it to. The only good 
>thing about the GEC take over of Plessey was that the
>pension was marginally 
>better. I don't think the Plessey Mark IV connectors
>are made any more by 
>anyone - I think the military use the Amphenol variety
>these days. In fact, the 
>coarse thread variety used cadmium plate and
>passivated finish, so they 
>definitely won't be made!
>73
>Peter G3RZP
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