kVA's 10J, Power Consumption?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Dave Larkin by way of Terry Fritz <twftesla-at-qwest-dot-net>" <teslaman15-at-hotmail-dot-com>

I was looking around the kVA effects site today and noticed a discrepancy in 
the quoted power requirement for the 10J.  On the mian page at -

http://www.teslacoil-dot-com/html/content/equipment.htm

It is listed as 240V 100A (24kVA), but in the 'rental guide' -

http://www.teslacoil-dot-com/files/kVA Effects Rental Guide.zip

they list it as 480V 75A (36kVA), which is correct?  or is the coil 
configurable for either?  If so why is the efficiency so much poorer at the 
higher input voltage?  Is it perhaps just a question of 75A being a 
'standard' feed?

-Dave-