Electrical Plug

[lcv800]

Still waiting for my 2015 Voltage 3990. Tentative delivery in two weeks. Hopefully Chicago snow will be gone by then! In the mean time, I'm having an electrician run 50 amp service to my garage so I can plug in. He wants to know what outlet (NEMA rating?) to install. I know its a 3 flat and one round type plug from pictures, but that's it. Not a handy guy so any help would be appreciated. Thanks, and think Spring!
Rusty

[sundancer 87]

Looks like this. I can't see the NEMA because I'm plugged in but I can get it if the picture doesn't help.

[nmroper]

Maybe this will help:

http://www.myrv.us/electric/Pg/50amp_Service.htm

[eightydo]

NEMA 14-50
NEMA 12 Box
120V
120V
Neutral
Ground