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.