Some pictures of our mining rig 
Do not you have enough money from your pre-orders to buy some PDUs? Hope you don't burn the warehouse with all the rigs inside...
This is one lame and unprofessional setup from a H/W manufacturer...
It's electrically correct for a 3-phase system even for north american standards.
Why on Earth would you think they would use PDUs? they are limiting in a high power usage environment plus the cost is horrific compared to Rack mounted Switchboards.
- PDUs
Most PDU manufactures max rating is 32amps.
Those miners are 1600w each.
9*1600 - 14.4kw per rack.
At 230volts thats 62.6amps per rack.
So 2x 32amp PDUs required....
Wholesale - 1k each atleast.
http://digipower.en.alibaba.com/product/286438990-209769952/16_ports_230V_32_amp_IP_PDU_Switched_Monitored_power_distribution_unit.html
- MCB's
1X Schneider Electric 3 Ø Main Switch will a Standard 64amp 230/240 Volt. - $122 from our local electrical supplier.
10X Schneider Electric MCB 10amp 230/240v breaker - $4-12 each.
1X Schneider Electric Inline watt meter - $26
10X IEC320 C13 Plugs (Jug Plug) - $1.2
1M Din rail
About 10 bucks in flexi cable
Roughly $220 bucks all up per rack, Thats 10 racks outfitted with Switchboard Mounted racks vs 1 outfitted with 2 PDUs.
Logic ....