1 Scope
1.1 This part stipulates the procedures of risk assessment for electrical equipment safety. It also gives the information on implementing risk assessment, and describes the procedures of identifying dangers, estimating and evaluating risks, comparing risks and necessarily reducing risks.
1.2 This part is applicable to all kinds of electrical equipment with AC voltage of 1,000V and below and DC voltage of 1,500V and below, and puts forward the general principle of achieving safety during the safety risk assessment of the equipment. In this part, the knowledge and experience of design, manufacture, installation, use, maintenance, unexpected incidents and harm of electrical equipment are collected, so that the possible damage of electrical equipment risks to personnel and property is analyzed, the risks in each stage of the life cycle of electrical equipment are assessed, and the basic measures to reduce risks are put forward.
1.3 The purpose of this part is to provide guidance on how to make safety decision of electrical equipment and on how to form various documents proving that risk assessment has been implemented. If all the dangers listed in Part 2 of this standard are solved by adopting the corresponding international and national standards for professional product safety, it may be regarded that the necessary risk reduction is achieved as required in this part, and that the product is safe.
1.4 For electrical equipment with internally generated voltage higher than 1,000V AC and 1,500V DC, if the generated voltage is untouchable, the electrical equipment also falls into the applicable scope of this part.
1.5 This part is not applicable to the risk assessment of the use of electrical equipment, nor does it specify the information on the use of electrical equipment.
2 Normative references
The following normative documents contain provisions which, through reference in this part of GB/T 22696, constitute provisions of this part. For dated references, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. For undated references, the latest editions apply to this part.
GB/T 4776 Electrical safety terminology
GB 19517-2004 National safety technical code for electric equipment
GB/T 19678 Preparation of instructions - Structuring, content and presentation (GB/T 19678-2005, IEC 62079:2001, IDT)
ISO 13407:1999 Human-centred design processes for interactive systems
3 Terms and definitions
For the purposes of this part of GB/T 22696, the terms and definitions given in GB/T 4776 and the following apply.
Foreword I
1 Scope
2 Normative references
3 Terms and definitions
4 General rules
4.1 Safety principle
4.2 Process of safety risk assessment
4.3 Risk assessment information
5 Determining the restrictions on electrical equipment
5.1 Use restrictions
5.2 Space restrictions
5.3 Time restrictions
5.4 Other restrictions
6 Identifying dangers
7 Risk estimation
7.1 General
7.2 Risk factors
7.3 Factors to be considered in risk estimation
8 Risk evaluation
8.1 General
8.2 Factors to be considered in risk evaluation
8.3 Elimination of dangers or reduction of risks through protective measures
8.4 Risk comparison
9 Risk reduction
10 Documents
Bibliography
Figure 1 Schematic diagram of safety principles
Figure 2 Logical process of risk assessment
Figure 3 Risk factors of risk estimation
Figure 4 Risk estimation
Figure 5 Risk reduction process
