Sunday, Mar 10, 2013 at 17:30
There are any number of plugs that are better for the job but none of them have become standardised.
The fridge makers don't help, both the major fridge makers have their own non standard for the connection at the appliacne end or the supply end or both.
The T plug, ( same as our 240v mains plug but with 2 pins arranged in a T) has been a standard DC supply plug in this country for decades.
They are
well and truly capable of handling 15 amps continuous when in good condition and they are pretty reliable......but people turn their noses up against them...on the basis of price or size..some even clam them to be unreliable..sorry I cant see it.
The film and television industry world wide has been using the 4 pin XLR plug for DC supplies since valves went the day of the dodo in video cameras......the 4 pin is used to prevent confusion with the 3 pin used for professional microphones......the 4 pin is rated at 7.5 amps continuous per pin.....and they are about as reliable as a plug gets.
If there is no issue with confusion with microphone plugs, the 3 pin XLR is an excelent connector...redily available tough as, excelent strain relief and good for 15 amps continuous...and it is a latching plug.
Yamaha used to have a special non standard 2 pin version made for its CP series portable electric grand painos.....its a pitty it was never widely made or standardised.
While we are in the audio market.....the SPEAKON would make an excelent DC connector....good contact resistance good current and voltage capacity and a very strong strain relief.
There is the CB radio microphone plug....available in 2,3,4, 5 and rarely in 6 pin.....a great little plug, good for about 7.5 amps in the 2, 3 & 4 pin.....these are used extensivly in DC power supply leads for low to mid range sound equipment....they have a threaded locking ring and excelent strain relief.
They are also used for connecting all sorts of stuff to a wide range of buggeryboxes in all fields of electronics
There is the marine bi-pin, that has a large and a small pin, in both a push in version...which while a little chincy works
well...and a threaded ring locking version with a metal body .....looks crude but they are reliable and good for 15 amps.
Then there are the Amphinol and Cannon milspec connectors that have been around for decades, nice plugs made by Hirshman, Hirose and others.
There is even a 2 pin version of the 5,6 & 7 pin trailer connector.
But nothing standardised.
In my view one of the most rediculous things is connecting a 3.5 amp current drain item using a 50 amp anderson plug...a plug way too big for the cable, no strain relief and massivly bulky.
There is a lower rated version of the anderson plug that comes in single pole connectors..red & black, that can be linked together into build multi pin plugs...these are a great little thing but no one seems to use em or even know about em
I can certainly see a very good case for hard wiring a fridge cable into the vehicle......but most people cant be bothered doing it prorperly.
A little screw top
junction box with a cord clamp strain relief.
after all there is a plug on the fridge end...buy another cable f you want to plug it into a ciggy lighter.
cheers
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