Electronics > Projects, Designs, and Technical Stuff
Insulating washers & creepage/clearance issue at holes
mzzj:
--- Quote from: dom0 on November 04, 2019, 06:19:09 pm ---Agree with floobydust. Insulating washer and pad are only used for functional insulation, not safety insulation. An interesting case would be a device mounted to the case / external heatsink on a class I device. Not sure if I actually ever saw that. It is of course very common on the secondary, already mains-insulated side of things (amplifiers, power supplies etc.).
--- End quote ---
Seen more than one power supply where TO-220 mosfets are mounted to smaller aluminium block that is mounted and isolated with rated insulation to the case.
Intermediate piece is usually tied to "live" part of the circuitry, helps to keep the differential mode switching noise away from the ground where its harder to filter.
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