The switch to activate this trap is located in the starting area, near the MK14. It costs 500 points. When activated, the floor of the Hoard More will become electrified, dealing damage to zombies in the area, but not the player. However, it will produce an EMP to players that are in the room when activated, meaning that the player's exo will be deactivated as long as they are on the floor and the Electrified Floor is active.
If one decides to cut through the Hoard More to go into another area, it is worth using this trap to deal damage to the zombies that will go after the player. As it is located in the starting area, it can be used from the start, although it might be better to instead save points for off-wall weapons and doors.