An electric facility a cover secured on a primary circuit board and having one or more orifices, a secondary circuit board disposed on the primary circuit board and having one or more sockets engaged through the orifices of the cover, and one or more cables each having a plug for engaging into the socket and for coupling to the secondary circuit board. The secondary circuit board is received in a housing for being prevented from EMI. The plug and the socket each has a conductor coupled together and shielded by the plug and the socket for being prevented from EMI.