(Unknown Title)

...was to switch them over to 240v. I'm in an appartment, so my options are limited, but I was able to plugin to the 40AMP 240V outlet for my electric stove...

Where do you find a 240v adapter for the PSUs?

Or did you stay at 120v and use something like this?

http://www.amazon.com/Jard-Magnetics-10048PC-Fully-Isolated-Transformer/dp/B003AT7CJ0

Nope. The corsair AX1200 I use automatically switches to 240v, and about %4 more efficient at the higher voltage (their stats, I don't have a 240v amp meter)

http://www.horticulturesource.com/hydrofarm-240-volt-8-ballast-power-cord-p6174/?osCsid=87326d44bee99fdc1dd1801cd8383fc3

The same store sells a quality made three socket 240v extension cord too..

I wouldn't recommend mixing 120v style cords in a 240v power environment. In general, datacenters run C14 power cords for 240v systems: http://www.newegg.com/Product/Product.aspx?Item=N82E16812115051&nm_mc=OTC-Froogle&cm_mmc=OTC-Froogle-_-Cables-_-Hewlett-Packard-_-12115051

I know from experience, acrid electrical smoke and burnt electronics, that when you expect an outlet to be 120v because of the connector and you plug a 120v switched device into a 240v plug you're just kinda screwed. Best to have the 120v as C13 and 240v as C14. Makes life easier. The power distribution on my rack all runs C14 for this reason.

I used the 240v plug that is commonly used on air conditioners (in the US) then just cut the ends from my psu plugs and attached the new plug ends...there can be no mix up that way. But since I was running new wire/plugs/subpanel I had the choice to use any plug style I wanted.

edit: I am using NEMA 6-20 ends on mine.