generally you should fold small pairs from EP in limit but if the game is very loose passive you can get away with limping these hands. you just need to be fairly certain multiple players will limp behind.
i wouldn't get in the habit of limping these hands in EP... only if you find yourself in an extremely loose/passive game.
this chart is very good imo. it shows how many limpers you need in the pot to play certain hands.
at the bottom it explains how to read the chart.