Who uses an extension cord for their rigs?

[poby]

Just bear in mind a 1500 watt power supply can draw more than 1500 watts.  e.g. at 90% efficiency, it will draw around 1650 watts to supply 1500 watts output.  Probably not an issue as you won't be sucking the maximum out of it but good to keep it in mind.

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[bit815792215]

be careful op, some extension cords are really really bad and thickness won't cut it

[QuintLeo]

A 12 gauge, or a pair of 14 gauge (1 per PS) should be enough to run your setup.
I'd seriously consider going to 10 or 12 respectively though to reduce voltage drop and heat buildup - and keep in mind that the CONTACTS are going to heat up quite a bit in any event, the heavier-duty cords will tend to have heavier-duty contacts as well.

However, no matter HOW you do it you are not going to meet code - the NEC specifically prohibits the usage of extension cords for "permanent" installations.

 This is not to say that you can't use one SAFELY, if you take proper precautions against tripping over the extension cord or letting critters chew on it and such.

 I don't see there being an issue with the "hole in the drywall and put a pipe in it" idea, that actually CAN meet code if done right since you're not breaching a firewall.