This Standard specifies requirements for two classes of insulating mats to protect personnel where circumstances involve the possibility of contact with conductors or electrical equipment whose nominal voltage does not exceed 650 V whether a.c. r.m.s. or d.c., between conductors or between conductors and earth.This Standard does not apply to the following:(a) Insulating mats for use with equipment rated at voltages greater than 650 V.(b) Insulating covers.NOTE: Attention is drawn to Appendix A which provides storage and inspection guidance.