How to enhance the shielding of a PLC with power line carrier circuitry in its plastic housing?

Enhanced shielding for power line carrier PLC plastic housings requires conductive coatings or metallization. Conductive coatings include conductive paint (such as silver-copper paint), arc spraying (such as zinc spraying), or chemical plating (such as electroless nickel plating). Coating thickness is typically 10-30 μm, with a surface resistivity of less than 1 Ω/sq. For internal components, conductive cloth or aluminum foil can be used. Seams should be designed with overlapping structures and sealed with conductive tape. During testing, a shielding effectiveness testing system should be used; the shielding effectiveness should be greater than 40 dB in the 30 MHz-1 GHz range. Enhanced shielding allows plastic housings to achieve similar performance to metal housings, reducing costs while meeting EMC requirements.