DATACENTER: inductive power measurement

[Peter Polasek <pete@cobra.brass.com>]

We have seen a significant discrepancy between the actual and 
computed power consumption in a rack (using the the manufacturer's 
average consumption rating for the computation).  Therefore, in 
our power analysis, we would like to measure the actual power load 
in addition to computing the theoretical peak and average rates.
Is there a inductive device that allows the power or current draw 
to be non-intrusively measured (i.e. does not require the equipment 
to be powered down or the breaker to be physically dismantled).  
The 'Fluke Model 33' was recommended to me; however, I'm not sure 
whether that is (or any device) has an inductive pickup that can 
be used for non-intrusive power measurement.

Thanks in advance,

Peter Polasek
pete@brass.com