Blue plug pinout

LadyInBed said:
3pin is no problem ( L/+) and earth marked
4pin has L1 L2 L3 and earth. I assume it is expecting 3phase and for single phase live and neutral would go between L1 and L2, but I want it confirmed ;)
Click to expand...
I assume the 4 pin plug is a blue plug? If so, it is a 240 v 3-phase and earth plug.

You would have to connect live and neutral to any two of the phase connections - the fourth pin is the earth pin.

Connect live and neutral to either L1 and L2, or L2 and L3, or L1 and L3 - not forgetting the earth! It does not matter which way around you connect the live and neutral. Make sure you have a double pole isolator, as both lines will have potential (voltage).
 
philip_stevens said:
I assume the 4 pin plug is a blue plug? If so, it is a 240 v 3-phase and earth plug.

You would have to connect live and neutral to any two of the phase connections - the fourth pin is the earth pin.

Connect live and neutral to either L1 and L2, or L2 and L3, or L1 and L3 - not forgetting the earth! It does not matter which way around you connect the live and neutral. Make sure you have a double pole isolator, as both lines will have potential (voltage).
Click to expand...
How does this work when the OP is wiring a 32A 4 pin plug to a 16A 3 pin socket.
Some marinas have 4 pin sockets to control that outlet
You chaps are barking up the wrong tree
 
philip_stevens said:
I assume the 4 pin plug is a blue plug? If so, it is a 240 v 3-phase and earth plug.

You would have to connect live and neutral to any two of the phase connections - the fourth pin is the earth pin.

Connect live and neutral to either L1 and L2, or L2 and L3, or L1 and L3 - not forgetting the earth! It does not matter which way around you connect the live and neutral. Make sure you have a double pole isolator, as both lines will have potential (voltage).
Click to expand...
Yes, that is what I thought, as my post above.
3phase Y with ground at the centre point of the Y.
It's a long time since I did any 3phase work!
 
philip_stevens said:
You would have to connect live and neutral to any two of the phase connections - the fourth pin is the earth pin.

Connect live and neutral to either L1 and L2, or L2 and L3, or L1 and L3 - not forgetting the earth! It does not matter which way around you connect the live and neutral. Make sure you have a double pole isolator, as both lines will have potential (voltage).
Click to expand...

Wouldn't this result in a 440v output?
 
To the OP

You CANNOT make up a lead from a FOUR pin 3 phase plug to a single phase socket.

the FOUR pin 3 phase pugs DO NOT have a neutral.

You can make a lead as you want from a FIVE pin 3 phase plug which does have a neutral, but presumably you chose a 4 pin plug because you only have a 4 pin 3 phase socket.

Sorry, it just won't work.
 
LadyInBed said:
3pin is no problem ( L/+) and earth marked
4pin has L1 L2 L3 and earth. I assume it is expecting 3phase and for single phase live and neutral would go between L1 and L2, but I want it confirmed ;)
Click to expand...

If you can avoid it do not use that plug in the EU unless you know for certain what you are plugging in to.
It is specified for a 3phase system with a maximum voltage between any pins of 250v.
There are very few places left in the EU where this system is in use its called delta power and consists of 3 legs of 127v giving 220v between phases.
There is just a vague chance that the supply is off a 3phase isolating transformer in which case this would be the correct connector to use
Now the second reason not to use it is that its a 32amp plug this means that in the event of a fault condition your system will be able to draw 32amps through 16amp cable and connector, not a clever move!
If thie socket you are plugging into is in the UK I suggest you get it checked by a competent electrician it as it is not acceptable under current regs.
Sorry to be a doom monger but have in my professional capacity seen fires damage and people hurt by misuse of connectors.
 
ProDave said:
To the OP

You CANNOT make up a lead from a FOUR pin 3 phase plug to a single phase socket.

the FOUR pin 3 phase pugs DO NOT have a neutral.

You can make a lead as you want from a FIVE pin 3 phase plug which does have a neutral, but presumably you chose a 4 pin plug because you only have a 4 pin 3 phase socket.

Sorry, it just won't work.
Click to expand...

Tell that to the Spanish! Some of their marinas only have 4pin outlets, so you have to use a 4 to 3pin adapter (which I had to borrow).
I am sorry to be blunt, but you are wrong.
3phase Y agreed does not have a neutral, you get 240v between any two phases, each phase is 120v to the centre of the Y where you connect the earth.
 
LadyInBed said:
Tell that to the Spanish! Some of their marinas only have 4pin outlets, so you have to use a 4 to 3pin adapter (which I had to borrow).
I am sorry to be blunt, but you are wrong.
3phase Y agreed does not have a neutral, you get 240v between any two phases, each phase is 120v to the centre of the Y where you connect the earth.
Click to expand...
Not in the UK.

Phase to phase in the UK is 400V

You did not say this was for some foreign wiring system, so I assumed you were talking about the Uk, so the same still applies, in the UK you CANNOT make a lead from a 4 pin 3 phase plug to a 3 pin 240V socket, without blowing up all your 240V kit.
 
One thing that is obvious is that you have to know what is going on with the power supply coming out of 4 pin plug. It would be very dangerous to think you can wire up an adapter plug without knowing for sure what the power supply is. As said there are various options and certainly the 5 pin plug type would be clearer. Don't just trust to luck or indeed advice from this forum. Find someone who knows and is licensed to do the job. It is ilegal to wire up a plug without a licence around here but many of us do it but this is not a simple wire up job. olewill
 
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