Hi, fvmw7460, and welcome to the forum. Good to "see" you and hope you enjoy your visit(s).
Have you tried a different mains wall plug? Have you tried a different USB cord (preferably, use the one that came with the iPad)? Have you made sure the charger you are using is for the iPad (it should say it's a 10W USB Power Adaptor with output of 5.1 volts/2.1A)?
If all the answers are yes, let us know and we'll try to figure something else out. Cause, obviously, it not charging at the mains is not "normal" behavior.
Marilyn