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The general insulating rubber pad shall be marked with distinct grade and manufacturer's mark; The insulating rubber pad used for electrical work shall be marked with double triangle symbol, grade and manufacturer mark, and there shall be no harmful irregularity on the left and right surfaces. The irregularity of harm refers to one of the following characteristics: destroying symmetry, destroying the defects of smooth surface, such as small round hole gap, partial protrusion, wound, mixed conductive dirt, crease, gap, convex concave wavy pattern and forging mark, etc. The thickness inspection shall be carried out according to relevant specifications, and five different points on the surface of all mats (blankets) shall be randomly selected for measurement and inspection. When measuring, use vernier caliper or instruments with the same precision. The precision of vernier caliper should be within 0.02mm, the diameter of drill is 6mm, and the diameter of presser foot in plan is (3.17mm) ± 25) mm, the presser foot should be able to release (0. 83 0 ± 03) n. The insulating rubber pad should be placed flat so that the middle of the measuring surface of the vernier caliper is smooth.
Insulation rubber pad is made of special rubber, with excellent insulation characteristics, which can be divided into general insulation rubber pad and electrical insulation rubber pad. Generally, the insulating rubber pad can be divided into high pressure and bottom pressure.
It is generally used in the area of electrified machinery and equipment, and it is laid on the pavement of high and low voltage distribution room and on both sides of the control cabinet, protection panel, generator set and generator exciter of condenser. Its effect is basically the same as that of insulating boots. When carrying out the actual operation of the power switch, it can improve the insulation of the actual operation staff to the ground, prevent or alleviate the damage to the body caused by touching the working voltage and step voltage when single-phase grounding or electrical equipment insulation is damaged. The insulating rubber mat paved on the road surface of the distribution room can replace the insulating shoes and has the insulating effect. Therefore, at 1kV and below, the insulating rubber pad can be used as a basic safety appliance; When it is above 1kV, it is only used as auxiliary safety equipment.