On Sat, 22 Mar 2014 14:22:04 -0400, "Mr. Luddite"
wrote:

If you are not familiar with these 3 phase services and don't know what
your marina has, I highly recommend having a licensed electrician
familiar with marine service wiring help you.

===

That's excellent advice in my opinion. If you have an expert
electrician involved there's a good chance that they can work with the
marina to get the service you need.

If your only need for 240 volts is to test stage lighting there may be
some other alternatives worth considering. One possible option is a
transformer to step up 120 to 240 volts. You can buy used
transformers on EBAY for reasonable prices. Another possibility if
you only need the 240 volts in short intervals is to get an inverter
that converts 12 volts DC to 240 volts AC. Since lighting is very
non-critical with regard to waveform, you do not need a sine wave
inverter.