Standard No.:	DL/T 621-1997
English Name:	Grounding for AC Electrical Installations
Chinese Name:	交流电气装置的接地
Chinese Classification:	P63    Power supply and distribution engineering
Professional Classification:	DL    Professional Standard - Electricity
Issued by:	Ministry of Power Industry
Issued on:	1997-09-02
Implemented on:	1998-1-1
Status:	abolished
Abolished on:	2015-01-14
Superseding:	SDJ 8-1979 SD 119-1984
Language:	English
File Format:	PDF
Word Count:	13000 words
Price(USD):	320.0
Delivery:	via email in 1 business day

This standard specifies the grounding requirements and methods for the electrical installations for power generation, transformation, transmission and distribution for who nominal AC voltage are lower than 500kV (hereinafter referred to as "A-category electrical installations") and the building electrical installations (hereinafter referred to as "B-category electrical installations").

1. Scope 2. Terms and Definitions 3. General provisions for grounding of A-category electrical installations 4. Scope of protective ground of A-category electrical installations 5. Ground resistance of A-category electrical installations 5.1 Ground resistance of the electrical installation in the power plant and transformer station 5.2 The ground resistance of the overhead network 5.3 The ground resistance of the electrical installation for power distribution 6. Grounding connection of the A-category electrical installations 6.1 General provisions of grounding connection 6.2 Grounding connection of the electrical installation in the power plant and transformer station 6.3 Grounding connection of poles and towers of overhead network 6.4 Electrical installation of power distribution installations 7 The grounding type of low-voltage system and the ground resistance of B-category electrical installations 7.1 System grounding type 7.2 Ground resistance and equipotential connection of the grounding connection, 8 Grounding connection and protective conductor of B-category electrical installations 8.1 General requirements 8.2 Grounding connection 8.3 Protective conductor 8.4 Grounding connection 8.5 Equipotential coupling cable Annex A (Normative Annex) Annex B (Normative Annex) Annex C (Normative Annex) Annex D (Normative Annex) Annex E (Normative Annex) Annex F (Informative Annex)