110v to mains junction box which should be 240v?

Question

job is in petrol station possibly through contactor

Answer 1

What are you asking?? Should probably be Ex. rated, what's it for? Where is it?

Answer 2

OK, so asked this question now 3 times, and three times people don't know what you are asking.....
Let me try to read your mind:
You have a junction box, it only has 110V, but you bought something (whatever a "son light" is) and it should run on 240 Volt.
Right?
You have 3 choices:
1) Your hydro supply may actually be 2 X 110 = 220 volt at the fuse box. If that is the case then all you need is an electrician to run one more (red) wire from the fuse box to your junction box.
2) Your Hydro supply is only 1 X 110 Volt, which I doubt for a gas (sorry, petrol) station, in which case you need a step-up transformer from 110V to 240 V. Those are expensive ($500.- for, say, 2000 Watt [no idea how many watt you need, you don't say]), and inefficient (85%).
3) Notice in answer 1) above that you will only get 2 X 110 = 220 Volt. Usually, you get by with running a 240V lamp on 220V, you hardly notice that it is ever so slightly dimmer.
But if you insist, then you need a transformer again.

Answer 3

Well, the question is unclear, but If I had to guess, I'd say one of the "hot" lines is open (blown fuse, broken wire...) and you are measuring from line to the grounded (neutral) conductor, or, another idea, one of the line conductors is shorted to ground (which would blow a fuse) and so measuring "line" (grounded) to line gives you the 110v reading

Answer 4

More detail on the question.

But, if you have a 240v outlet, and you take a voltage reading across one lead and the ground you will get a reading of 120v.

Answer 5

Is this a question?

What are you asking?