the other necessary control power hydraulic etc lines into the umbilical 136 one of ordinary skill will appreciate that the block diagram of power supply unit 201 shown in fig2 a is greatly simplified accordingly many other known elements may be included within power supply unit 201 depending on for example the particular type and number of subsea loads being driven e g flapper valves ball valves solenoid valves retainer valves pipe ram seals shear ram seals etc for example in certain embodiments dual polarity power may be required to operate the load in which case a polarity relay module may be included furthermore various additional control electronics such as multiplexors and demultiplexors may be implemented to allow for multiple load control and multiple line ground fault detection line enable relay module 205 is configured to allow for switching between two configurations a fault detect configuration and normal configuration not shown under fault detect configuration electrical subsea conductor lines 237 and 239 may be connected to ground fault detection lines 225 and 227 respectively alternatively under normal configuration electrical subsea conductor lines 237 and 239 may be connected to current source line 221 and current return line 223 respectively in accordance with one or more embodiments of the invention the line enable relay module 205 may be configured to default to the fault detect configuration i e fault detect power lines 225 and 227 are wired to the normally closed terminals of their respective relays on the line enable relay module 205 in accordance with one or more embodiments the ground fault detection system may be configured to detect ground faults when in an idle state i e when no subsea loads are being powered one of ordinary skill will appreciate that the electrical subsea conductor.