[Greg Barringer]

Let me add that you’ve gotten good advice in the posts above. I have never wire a studio and other members will know much more about those details.

One other point is a 3 phase service will probably be 120/208 volts, not 120/240. 120/208 is a standard voltage in the U.S. just make sure to check the specs. when ordering 240 or 208 volt equipment. Msny UL labels will say 208-240 volts meaning it accepts both.

[Greg Barringer]

Is photo.jpeg the same as .AVI?

[Greg Barringer]

277 volts is the single phase voltage of a 277/480 volt, 3 phase system. In other words a single 20 amp breaker will give you 277 volts. A double pole or 3 pole breaker will give you 480 volts. Someone mentioned that 277 volt lighting is more efficient than 120 volt lighting, this is not true. The advantage to a higher voltage is that more fixtures can be placed on one circuit. Another advantage is higher voltage can be run a longer distance without a voltage drop. In a long run like 200 ft., smaller wire can be used. To get 120/240 volt, single phase or 3 phase from 277/480 you’ll need a transformer. This would be purchased by you.

Since you know of no equipment that uses 277 volts, go with a 120/240 volt 3 phase system, if 3 phase is available. If 3 phase is not available, you’re stuck with single phase. One advantage to 3 phase is in motors. A 3 phase motor will last longer than a single phase one. That means your AC Units would be better off using 3 phase.

Some of the calculations in earlier posts are flawed. An electrical engineer or a good electrician can calculate your total load but they need some of your lighting requirements. This can be found on each light or piece of equipment. It’s on the required UL label. Write down the voltage, amperage or wattage of each unit. Tell them you want a dedicated 20 amp circuit for each computer and each could have a total load as high as 1500 watts each. They can then calculate the remaining load of AC, kitchens, and other requirements.

FYI, the correct formula for calculating a 20 amp circuit is;
120 volts x 20 amps = 2,400 watts.
A safety factor of 80% is required by the National Electric Code, so the true wattage of a 20 amp circuit is;
2,400 watts x .8 = 1,920 watts

Let say your total load is 60,000 watts.
In single phase the formula for the main service entrance would be;
60,000 watts / 240 volts = 250 amps
Using that same safety factor required by the NEC, you would multiply by 1.25
250 amp x 1.25 = 312.5 amps
The NEC also requires 30% for growth.
312.5 x 1.3 = 406.25 amps
Put in a 400 amp 120/240 volt single phase entrance.

In 3 phase you use the same formulas, then divide by the square root of 3
400 amp / 1.732 = 230 amps
Put in a 225 amp 120/240 volt 3 phase entrance.

You really don’t need to know all this, all you need is an Engineer or Electrician you can trust. Sometimes they want to put in an 800 entrance because it’s a money maker. Sometime they put in an entrance that’s too small and that will cause major problems.

I’m an electrical contractor with 27 yrs experience. If you want further advice, email me: barringer4@comcast.net

[Greg Barringer]

Does the mic show up in System Profiler under USB?

[Greg Barringer]

As Rafael said export as a Quick Time Movie, not a QT conversion. I’m assuming you want to take this into DVD Architect and burn BD, is that correct?

[Greg Barringer]

Is the Nikon D3s .AVI format better than AVCHD?

[Greg Barringer]

Just a guess but in System Preferences > Energy Saver is “Put hard drive to sleep when possible” checked?

[Greg Barringer]

Chris, I hope you let us know.

[Greg Barringer]

I don’t have an answer for recovery of the card. My only advice is to buy an external HD and set up Time Machine. It would have saved the day here.

[Greg Barringer]

Do you have the latest driver and CUDA Application Support?
From Nvidia web site:

“In order to run MAC OS Applications that leverage the CUDA architecture of the NVIDIA GPU, you will need to download a runtime CUDA driver. This is specific for the GeForce GTX 285 for MAC and the Graphics Driver 18.5.2 shown above. Please download and install the latest CUDA driver for MAC located here.

New in Release 18.5.2f16:

* Improved compatibility with recent Mac OS X Software Updates.”