I NEED TO UPDATE MY ELECTRICAL PANEL TO 220A SERVICE. I FIND THAT SOME OF MY NEUTRAL AND GROUND WIRES ARE A BIT SHORT OF REACHING THE GROUNDING BAR. HOW DO I EXTEND THESE WIRES? CAN I ADD PIG TAILS TO EACH WIRE, USING WIRE NUTS?
I am NOT a pro licensed electrician - and please wait until one or more confirms this - but I believe that the preliminary answer is yes, you can pigtail with the same size wire in this situation.
Also, you can double-check with your Building Inspection Department for local code on what is acceptable. They should be permitting and inspecting this anyway.