When the Electrician sent by Manohar to drill holes in the Pooja room gets a shock, we can see the electric socket on the wall, but later when Manohar is checking the room the wall is bare.
Additionally, when Manohar is hammering the nails the first time and enters the Puja room, there is no electrical socket. So the electrical outlet was stuck to the wall only when the Eletrician comes in.