The PWS-2k53-BR, as part of the Blade enclosure package, comes with the CBL-0223L 2500W/2000W power extension cord. If you purchase the PWS-2K53-BR separately, this power extension cord and any other power cord is NOT included.
The CBL-0223L power extension cord can’t be plugged into the wall outlet directly. Normally, we connect it to the PDU first. Supermicro has the MCP-520-00036-0N power distribution unit (PDU) with NEMA L6-30 plug. The PDU can also be purchased from a reputable 3rd-party manufacturer to meet your datacenter requirement.
If you want to connect directly into the wall outlet:
In US, please use CBL-0247L USA BLADE POWER CORD 6-20P TO C19 PBF.
In UK, please use the CBL-0241L UK BLADE POWER CORD C19 TO BS 1363, PBF.
Please refer to the power cord table for more information: http://www.supermicro.com/products/superblade/powersupply/powercordtable.cfm