I know this topic has been discussed many times; however, I haven't found anything that will help with this outlet type specifically. I am using a L15-20 plug on the end of my machine cord and would like to make some pigtail adapters for it. Questions:

1) Is it acceptable to use a female L15-20 and make a pigtail down to a 110v outlet (removing the red wire of course)?

2) Is it ok to use a female L15-20 and run it up to a 480V outlet?

3) Does it matter what side the black and white wires go on when dropping to 110v?

Any answers to these questions would be very helpful and appreciated.