IEC 60255-5 pdf download Electrical relays – Part 5: Insulation coordination for measuring relays and protection equipment – Requirements and tests 1 Scope and object This part of IEC 60255 gives general requirements for the insulation coordination ofmeasuring relays and protection equipment. NOTE 1 Unless otherwise stated,the term “relay(s)” is used as an abbreviation for the expression “measuringrelays and protection...