solenoid 61 being in the contracted position illustrated in fig2 and 3 controller 39 is in electrical communication with production tubing 29 through first source terminal 45 and with casing 52 through second source terminal 47 an electrical circuit is closed when production tubing 29 and casing 52 are both in contact with conductor 48 the circuit is closed before tubing hanger 31 reaches an axial depth such that dogs 55 are below grooved profile 53 axial position transmitter 49 receives electrical power from power supply 43 and in turn transmits a signal that is received by receiver 51 receiver 51 transmits an electrical signal that is indicative of the axial position of axial position transmitter 49 to modem 41 in controller 39 when axial position transmitter 49 reaches a predetermined depth location which is typically within wellhead 11 modem 41 of controller 39 sends an electrical signal to actuate solenoid 67 from its contracted position fig3 to its extended position fig4 solenoid 67 moves cam 61 axially upward causing inclined face 63 to slidingly engage a lower portion of each of suspension dogs 55 downward facing surface 65 prevents dogs 55 from moving axially upward with cam 61 instead suspension dogs 55 move radially outward to their radially outward position shown in fig4 in response to inclined face 63 slidingly engaging dogs 55 grooved profile 57 on the radially outward surface of dogs 55 engages grooved profile 53 of wellhead 11.