On 5/5/2017 6:57 AM, Taxed and Spent wrote:
Contractor wants to monitor commercial tenant's current load throughout
the day for a month or two to see max load, and thus see how much of the
1000 amp panel capacity is left for a future second tenant.

I see several Fluke meters that costs a fortune, such as:

http://www.fluke.com/fluke/inen/powe....htm?PID=77038


Any other suggestions?

I have zero experience with three phase...
What info can you get out of the utility meter?
Old meters that have a wheel can be read using
something like
https://www.bluelineinnovations.com/
I have the older model on my two-phase meter.

Mine's not three phase. It's digital, but it has an IR LED that
blinks according to the power consumption.
I programmed an old Palm Pilot to read the IR
and graph/log consumption. Duct taped it to the
meter along with a much bigger battery to get
enough run time.

If the meter has the blinky IR LED and you can get
your hands on an old palm pilot or Handspring Visor, email me.

Written in basic, and trivial.
Problem is bootstrapping the palm to get it all loaded.
I'm not sure that the basic interpreter is still easily
available on the web.
I had to load it on a new palm and IR it over the the old palm.
I'm not 100% sure that I can reconstruct the details of that process.

FWIW, when considering total loading, don't underestimate
the peak transient loads that happen when big motors start.
Those are hard to capture with simple equipment.