This part of IEC 61810 specifies the general requirements for the insulation coordination of electromechanical non-specified time all-or-nothing relays. This standard is based upon the basic safety standard for insulation coordination IEC 60664-1. This standard specifies the requirements for clearances, creepage distances and solid insulation for relays based upon performance criteria. It includes methods of electric testing with respect to insulation coordination for relays within low-voltage systems. It applies to relays for use up to 2 000 m above sea level, having a rated voltage up to 1 000 V a.c. or 1 500 V d.c. It does not include high-frequency requirements for insulation coordination. The requirements of this standard do not cover distances - through liquid insulation; - through gases other than air; - through compressed air.