A circuit card (1, 9) comprising a printed circuit board comprising: A first strain relief aperture (22-1... 22-8) positioned in and extending through a stay out zone of the circuit card proximate to a boundary edge of the circuit card, the stay out zone comprising a region of the circuit card where no uninsulated conductors are disposed, wherein the stay out zone is coincident with a spark gap sufficiently small so as to avoid arcing in the event of overvoltage situations; and a first conductor contact (42-1... 42-8) positioned in a conductor interface region of the circuit card (1, 9) proximate the stay out zone and radially inward of the stay out zone relative to a central axis of the circuit card, wherein a populated region of the circuit card (1, 9) configured to be populated with electronic components comprises a region of the circuit card (1, 9) radially inward of the conductor interface region; wherein a single conductor is received through the first strain relief aperture and connected in electrical communication with the first conductor contact, and a conformal coating of a poly(p-xylylene) polymer, the conformal coating having been applied following the interfacing of a conductor with the circuit card, and wherein the conformal coating comprises: a proximal coating zone comprising a backside depth on the aft side of the circuit card and a front side depth on the front side of the circuit card, wherein the conformal coating comprises a proximal coating zone thickness; a distal coating zone wherein conformal coating is prohibited; and a mesial coating zone disposed between the proximal coating zone and the distal coating zone and comprising a mesial coating zone depth wherein the conformal coating comprises a mesial coating zone thickness.. A first strain relief aperture (22-1... 22-8) positioned in and extending through a stay out zone of the circuit card proximate to a boundary edge of the circuit card, the stay out zone comprising a region of the circuit card where no uninsulated conductors are disposed, wherein the stay out zone is coincident with a spark gap sufficiently small so as to avoid arcing in the event of overvoltage situations; and a first conductor contact (42-1... 42-8) positioned in a conductor interface region of the circuit card (1, 9) proximate the stay out zone and radially inward of the stay out zone relative to a central axis of the circuit card, wherein a populated region of the circuit card (1, 9) configured to be populated with electronic components comprises a region of the circuit card (1, 9) radially inward of the conductor interface region; wherein a single conductor is received through the first strain relief aperture and connected in electrical communication with the first conductor contact, and a conformal coating of a poly(p-xylylene) polymer, the conformal coating having been applied following the interfacing of a conductor with the circuit card, and wherein the conformal coating comprises: a proximal coating zone comprising a backside depth on the aft side of the circuit card and a front side depth on the front side of the circuit card, wherein the conformal coating comprises a proximal coating zone thickness; a distal coating zone wherein conformal coating is prohibited; and a mesial coating zone disposed between the proximal coating zone and the distal coating zone and comprising a mesial coating zone depth wherein the conformal coating comprises a mesial coating zone thickness.. a proximal coating zone comprising a backside depth on the aft side of the circuit card and a front side depth on the front side of the circuit card, wherein the conformal coating comprises a proximal coating zone thickness; a distal coating zone wherein conformal coating is prohibited; and a mesial coating zone disposed between the proximal coating zone and the distal coating zone and comprising a mesial coating zone depth wherein the conformal coating comprises a mesial coating zone thickness..