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Technical Specification for Electrical Insulating Shoes



Electrical insulating shoes (boots) I. Classification and scope of use

1.1 Classification by upper material

Electrical insulating shoes (boots) are classified by upper material as shown in Table 1.

Table 1 Classification of insulating shoes (boots) by upper material

1.2 Classification by upper height is shown in Table 2.

Table 2 Classification of insulating shoes (boots) by upper height

1.3 Electrical insulating shoes (boots) can only be used as auxiliary safety equipment within the specified working voltage range. The requirements for the place of use are shown in Table 3.

Table 3 Requirements for place of use

II. Technical requirements

2.1 Structural requirements

The sole and heel should not have metal shanks or other parts. For electrical insulating shoes with toe protection and anti-impact function, the internal toe cap should be made of insulating material. If it is a metal toe cap, it must be insulated to ensure the insulation performance meets the requirements. During manufacturing, the toe cap should be placed between the upper and the lining at the front of the shoe, fixed and not movable or removable. The upper and sole connection should not use vertical stitching through the shoe; side stitching is allowed. 2.2 Shoe size requirements

Shoe sizes should comply with the provisions of GB/T 3293-2007 China shoe last series. 2.3 Upper requirements

2.3.1 The upper height should meet the requirements in Table 4.

Table 4 Height requirements (mm)

2.3.2 The upper thickness should meet the requirements in Table 5.

Table 5 Thickness requirements (mm)

2.4 Outsole requirements 2.4.1 Anti-slip patterns

The shaded area should have anti-slip patterns opening to the side, as shown in Figure 1.

Figure 1 Anti-slip area

2.4.2 Thickness

For directly injected, vulcanized, or adhesively bonded outsoles, the thickness should not be less than 4mm, and the pattern height should not be less than 2.5mm; for multi-layer outsoles, the thickness should not be less than 4mm, and the pattern height should not be less than 2.5mm;

For all-rubber and all-polymer material shoe outsoles, the thickness should not be less than 3mm, and the pattern height should not be less than 6mm; when the anti-slip pattern height cannot be measured, the outsole thickness at any place except the waist should not be less than 6mm. 2.4.3 Tear strength

The tear strength of non-leather outsoles should not be less than: ——8kN/m, applicable to materials with density greater than 0.9g/cm; ——5kN/m, applicable to materials with density less than or equal to 0.9g/cm. 2.4.4 Abrasion resistance

For non-leather outsoles of leather shoes, the relative volume abrasion loss for materials with density equal to or less than 0.9g/cm should not be greater than 250mm, and for materials with density greater than 0.9g/cm, the relative volume abrasion loss should not be greater than 150 mm.

For cloth-upper rubber shoes, the relative volume abrasion loss of the outsole should not be greater than 250 mm.

For all-rubber or all-polymer material shoes of 15kV and below, the relative volume abrasion loss of the outsole should not be greater than 250 mm; for all-rubber or all-polymer material shoes of 20kV and above, the relative volume abrasion loss of the outsole should not be greater

III. Test and inspection

3.1 General requirements

Through negotiation between the user and the manufacturer, additional requirements for test and inspection may be added to the user's manual. If necessary, destructive tests may be used to evaluate components. 3.2 Test and inspection items 3.2.1.1 Appearance and size inspection:

Check for defects such as damage, cracks, wear, holes, or scratches on the surface, and whether the upper and sole are intact. 3.2.1.2 Power frequency withstand voltage test

Check the ability of the test sample to withstand the power frequency voltage. See Appendix C for details. 3.2.1.3 Leakage current test

A test to check for internal defects in insulation, see Appendix C for details. 3.3 Staged test and inspection requirements 3.3.1 Type test

Test time: Type test is required under any of the following circumstances.

——Appraisal of new products or trial production appraisal for transfer of old products to another factory;

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