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[Scott Holtzman]

Agreed Scott.  Now where is drape for my 18" and 24" decks???

Bill

That's right, you wanted the the ripped drape to make some skirts out of....

The season's over....We are in shop cleaning mode after this weekend, how many linear feet did you need?

[William Schnake]

That's right, you wanted the the ripped drape to make some skirts out of....

The season's over....We are in shop cleaning mode after this weekend, how many linear feet did you need?

Scott, 108 linear ft 18" if possible.

Thanks

[joseph baio]

You would have to be on a 240 volt system not two 120 volt systems.  I believe that you would wire it as follows:

Black to Brass - 1st leg of 120 from a single phase 240 volt system
White to Silver - 2nd leg of 120 volts from a single phase 240 volt system
Green - Ground of the system

The key here is that you are not using two 120 volt lines you are using a 240 volt services with two hot lines.

Bill

Thanks for the clarification, I think my verbiage is in error. I understand the use of 240v USA and just making sure because as I understand it in Europe the 220v is delivered on one leg and I want to verify the amps can take the 240v across 2 hot legs and not a universal voltage single hot leg. I spoke to QSC earlier and they verified the pld 4.5 will do 240v USA. I assume Crown I-tech HD will follow suit.  thanks much, joey

[Scott Holtzman]

Thanks for the clarification, I think my verbiage is in error. I understand the use of 240v USA and just making sure because as I understand it in Europe the 220v is delivered on one leg and I want to verify the amps can take the 240v across 2 hot legs and not a universal voltage single hot leg. I spoke to QSC earlier and they verified the pld 4.5 will do 240v USA. I assume Crown I-tech HD will follow suit.  thanks much, joey

Mike Sokol, can you step in here and clarify please.  I think we are talking semantics, current has to return somewhere.  Euro 220v has the center tap bonded to ground.  the potential between the two wires is still 220v

I only see an issue on really old gear that has a single pole switch on the mains.

[Barry Singleton]

The I-TECH will happily run on Americas 240V single phase/ 120-120V.

All it really cares about is having a 50-60 Hz voltage differential accross the two line pins of 90-240V. Being on the high side of this is better if your running hard.

Barry.

[Daniel Levi]

Ground/Neutral is irrelevant here in order for current to flow there needs to be a potential difference.
In a regular 220/230/240v system you have a 240v RMS leg/conductor and a 0V leg/conductor naturally with a potential difference of 240V RMS. The fact that the 2nd leg/conductor is 0V doesn't matter, so long as it is different to the 1st leg/conductor current will flow.

In the 2 phase system you are still getting a potential difference of 240V RMS in regards to the 2 legs/conductors it's just that rather that one leg/conductor being at 0v it is at 120° out of phase with the 1st conductor, this means that when the 1st leg is at +120V RMS the 2nd leg is at -120V RMS creating the required potential difference of 240V RMS.

The tube network in London uses a DC version of the same sort of thing and also has no direct earth and trains designed for +750/630V - 0 work just fine on +210 - -420.   

[Barry Singleton]

....In the 2 phase system you are still getting a potential difference of 240V RMS in regards to the 2 legs/conductors it's just that rather that one leg/conductor being at 0v it is at 120° out of phase with the 1st conductor, this means that when the 1st leg is at +120V RMS the 2nd leg is at -120V RMS creating the required potential difference of 240V RMS...

The above describes two legs of a three phase system. The 120-120V combined voltage at 120 degrees phase will be 208V

120-120V at 180 degrees phase (single phase) will be 240V.

Either work fine.

Barry.

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