GB/T 13955-2017Installation and operation of residual current operated protective devices (English PDF)

1 Scope

GB/T 13955-2017 is the Chinese national standard on installation and operation of residual current operated protective devices, in the field of electrical engineering. The /T suffix marks it as a recommended standard: it is not compulsory by itself, but it becomes binding as soon as a contract, a tender or a customer specification calls it up - which in practice is how most foreign buyers meet it. It was issued on 29 December 2017 by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of China, and has been in force since 1 July 2018. Classification: ICS 29.120.50, CCS K09. This page is published from the official record of the standard held by the Chinese standards administration: the identification, the dates, the classification and the issuing body are taken from there. The clause text, the tables and the numeric limits are in the document itself, which is delivered complete in English translation.

This Standard specifies the relevant requirements for correct selection, installation and application of residual current operated protective devices (RCD) and their operational management. This Standard applies to AC power supply systems with a rated voltage not exceeding 400 V. This Standard does not apply to the protection against electric shock accidents, electrical equipment damages or electrical fire accidents between phases or between phases and N lines.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/Z 6829 General requirements for residual current operated protective devices

GB/T 10963.1 Electrical accessories - Circuit-breakers for overcurrent protection for household and similar installation - Part

3 Terms and definitions

For the purpose of this document, the following terms and definitions apply.

3.1 direct contact Contact between humans, animals AND live conductors.

3.2 indirect contact Contact between humans and animals AND the exposed conductor of a device that become charged in the event of a fault.

3.3 residual current IDelta An effective value of the vector sum of the current that passes through the RCD's main circuit.

3.4 residual operating current A residual current value that makes the RCD operate under specified conditions.

3.5 rated residual operating current IDeltan A residual operating current value specified by the manufacturer for RCDs. At this current value, the RCD shall operate under specified conditions.

3.6 residual non-operating current A residual current value, when less than or equal to this current, the RCD does not operate under specified conditions.

4 Application of RCDs

4.1 Protection against direct contact electric shock accidents In the protection against direct contact electric shock accidents, the RCD is only used as a supplementary protection measure of the basic protection measure of direct contact electric shock accidents (excluding the protection against direct contact electric shock accidents formed between phases, phases and N lines).

5 Selection of RCDs

5.1 Technical conditions of RCDs It shall comply with the specifications of GB/Z 6829, GB/T 10963.1, GB/T 14048.2, GB/T 16916, GB/T 16917, GB/T 20044, GB/T 28527, GB/T 22794, GB/T 22387, etc., and pass the China Compulsory Product Certification.

5.2 Technical parameters of RCDs The rated values (see Annex B) of technical parameters of RCDs shall be compatible with the technical parameters of the lines or equipment being protected and the specific conditions used for installation.

6 Installation of RCDs

6.1 Installation requirements for RCDs The installation requirements for RCDs are as follows:

6.3 Construction requirements for installation of RCDs The construction requirements for installation of RCDs are as follows: