This standard specifies the technical requirements, test methods, inspection rules, markings, packaging, and storage of electronic control equipment (hereinafter referred to as equipment) equipped with electronic devices for the humid tropical zone (code name TII). It is applicable to electrical control equipment with electronic devices working indoors in humid tropical areas. 2. The provisions contained in the following standards constitute the provisions of this standard by reference in this standard. At the time of publication of the standard, all versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest version of the following standards. GB 191-90 Packaging, Storage and Transportation Pictorial Symbols (ncq IsO 780: 1985) GB/T 2423.4-93 Basic Environmental Testing Procedures for Electrical and Electronic Products - Test Db; Alternating Damp Heat Test Clamping Method (eqv lEC 68-2-1-10: 1988) GB 2423.16-90 Basic Environmental Testing Procedures for Electrical and Electronic Products Test J: Long Mold Test Supervision Method (idt IEC 68-2-10: 1988) GB 2423.17-93 Basic Environmental Testing Procedures for Electrical and Electronic Products Test Ka: Salt Spray Test Method (eqv lEC 68-2-11: 1981) GB 3797-89 Electrical Control Equipment Part 2: Electrical Control Equipment Equipped with Electronic Devices GB 4208-93 Shell Protection Level (IP Code) (eqv lEC 529: 1989) JB 842-75 Technical Conditions for Packaging of Tropical Electrical Products JB 4159-85 General Technical Conditions for Tropical Electrical Products 3 Technical Requirements This standard should not only comply with the provisions of GB 3797, but also meet the following requirements. 3.1 The environmental conditions for the use of equipment should meet the provisions of Table 1. 3.2 The components and wires used in the equipment should be of the humid tropical type or meet the requirements for the use of humid tropical products. All components should be treated according to the relevant processes of humid tropical electrical products. 3.3 Equipment labels (including nameplates, circuit boards, grounding boards, and indicator boards) should have moisture and heat resistance, and their nameplates should be made of brass. 3.4 Printed circuit boards (or unit plugins) assembled from components such as resistors, capacitors, semiconductors, electronics, and microelectronics should use transition connectors instead of being directly used as plugs as much as possible; When it is necessary to use it as a plug, the plug part should be treated with gold plating. After all components are welded, debugged, and cleaned, they should be treated with moisture and mold resistance. For example, dip coating or spraying polyurethane varnish
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