This standard is equivalent to the international standard IEC 455 (1988) "General requirements for the identification and application of alphanumeric systems for terminal blocks and specific wire ends of equipment."

1 Topic content and scope of application

This standard specifies various methods of identifying the terminals of electrical equipment (hereinafter referred to as equipment), and formulates the general rules for identifying equipment terminals and specific wire ends using an alphanumeric system. This standard applies to identification marks of the terminals of equipment (such as resistors, fuses, relays, contactors, transformers, rotary motors, etc.) and combinations of these devices, and also applies to the identification of specific wire ends. When necessary, detailed application of these general rules for certain products and necessary auxiliary identification methods can be given in the relevant standards.

2 Reference standards

GB 4728 Graphical symbols for electrical drawings GB5465 Graphical symbols for electrical devices

3 Identification method

One or more of the following methods can be used to identify the device terminals and specific wire ends. 3.1 The marking system of the relevant product is used to determine and identify the actual or relative position of a device terminal or a specific wire end. 3.2 Use the marking system of the relevant product to identify and identify the color markings on the device terminals and on the ends of specific wire ends. 3.3 Use the graphic symbols specified in GB5465. If auxiliary symbols are used, they should be consistent with the figures in GB4728. 3.4 Use the alphanumeric symbols specified in chapter 5 of this standard.