A liquid-cooled plasma cutting system plasma torch lead plug to connect a plasma torch lead to a liquid-cooled plasma cutting system, the plasma torch lead plug comprising: a base portion configured to be coupled to the plasma torch lead, the base portion comprising a front face comprising an electrical grounding surface for the plasma torch lead; a set of ports disposed within the base portion , the set of ports including: a coolant supply port to convey a liquid coolant from the liquid-cooled plasma cutting system to a plasma arc torch connected to the plasma torch lead plug by the plasma torch lead, a coolant return port : i) defining a passage to convey return liquid coolant from the plasma arc torch to the liquid-cooled plasma cutting system, and ii) being configured to convey an operational current from the liquid-cooled plasma cutting system to the plasma arc torch connected to the base portion by the plasma torch lead, at least one plasma processing gas supply port to convey a plasma processing gas from the liquid-cooled plasma cutting system to the plasma arc torch, and an ohmic contact connector ; and a connector disposed about the base portion to couple the base portion to the liquid-cooled plasma cutting system and operably connect each of the coolant supply, the coolant return, the gas supply, the electrical grounding surface , and the ohmic contact connector to respective complementary connections of a torch lead receptacle of the liquid-cooled plasma cutting system upon coupling to the liquid-cooled plasma cutting system; characterized in that the electrical grounding surface for the plasma torch lead is formed along an outer edge of the front face . a base portion configured to be coupled to the plasma torch lead, the base portion comprising a front face comprising an electrical grounding surface for the plasma torch lead; a set of ports disposed within the base portion , the set of ports including: a coolant supply port to convey a liquid coolant from the liquid-cooled plasma cutting system to a plasma arc torch connected to the plasma torch lead plug by the plasma torch lead, a coolant return port : i) defining a passage to convey return liquid coolant from the plasma arc torch to the liquid-cooled plasma cutting system, and ii) being configured to convey an operational current from the liquid-cooled plasma cutting system to the plasma arc torch connected to the base portion by the plasma torch lead, at least one plasma processing gas supply port to convey a plasma processing gas from the liquid-cooled plasma cutting system to the plasma arc torch, and an ohmic contact connector ; and a coolant supply port to convey a liquid coolant from the liquid-cooled plasma cutting system to a plasma arc torch connected to the plasma torch lead plug by the plasma torch lead, a coolant return port : i) defining a passage to convey return liquid coolant from the plasma arc torch to the liquid-cooled plasma cutting system, and ii) being configured to convey an operational current from the liquid-cooled plasma cutting system to the plasma arc torch connected to the base portion by the plasma torch lead, at least one plasma processing gas supply port to convey a plasma processing gas from the liquid-cooled plasma cutting system to the plasma arc torch, and an ohmic contact connector ; and a connector disposed about the base portion to couple the base portion to the liquid-cooled plasma cutting system and operably connect each of the coolant supply, the coolant return, the gas supply, the electrical grounding surface , and the ohmic contact connector to respective complementary connections of a torch lead receptacle of the liquid-cooled plasma cutting system upon coupling to the liquid-cooled plasma cutting system; characterized in that the electrical grounding surface for the plasma torch lead is formed along an outer edge of the front face . <EOS>