I added yet another device to my system and wanted to plug it into an unused outlet on my P20. It’s a regular C15 plug with a ground pin, but for the life of me I can’t get it to plug into any of the open outlet positions on my P20. It plugs into a wall outlet just fine - it’s a stock cord from Pass so there’s nothing special about it.
Here’s a pic of one of the open outlets
I know these are “tight” outlets, but the amount of force I was using seemed a bit over the top.
Maybe you’re not used to tamper resistant receptacles? They have been around a little while but I assume they’re still pretty new to many. That shutter (you can see it in the picture and the TR label) prevents a child, or dumb adult, from sticking something into the receptacle other than the male end of a plug.
Well, considering that previous to my P20 I was using a P15 for almost 5 years, I’m at a bit of a loss as to why there’s any difficulty now. Unless… are these receptacles designed so that a new plug can’t be inserted if that power bank is on? 
Come to think of it I’m not sure if I’d ever done that before.
They do take a good deal of force, accompanied by gentle rocking.
The ones I’m trying to use must be extra stubborn. 
They can be obnoxious.
The weight of the P20 comes in handy at times. 
Good luck!
Those shutters will also fail at the most inopportune times. I don’t think my P20 has them but they were in an RV that I owned and one was unusable from new and another failed with a few uses.
Sometimes a wiggle back and forth will help the doors open. They are a general PITA.
My P20 has those. The power cable trials are a complete PITA at times especially leaning over a rack shoved up to the front wall and dealing with short cables to save dollars. I have my cheaper longer cables in the top duplex. The trying to get enough force without knocking P20 off its sorbothane footers 100 lb mass is easily exceeded.
A little extra wiggling seems to have gotten the job done. I don’t recall any of the other P20 outlets being quite as uncooperative.
