This part of GB/T 7251 defines the specific requirements for public electricity network distribution assemblies (PENDAs).
PENDAs have the following criteria:
——used for the distribution of electrical energy in three phase systems for which the rated voltage does not exceed 1,000 V a.c. (see Figure 101 for a typical distribution network);
——stationary;
——open ASSEMBLIES are not covered by this part;
——suitable for installation in places where only skilled persons have access for their use however outdoor types may be installed in situations that are accessible to ordinary persons;
——for indoor or outdoor use.
The object of this part is to state the definitions and to specify the service conditions, construction requirements, technical characteristics and tests for PENDAs. Network parameters may require tests at higher performance levels.
PENDAs may also include control and/or signalling devices associated with the distribution of electrical energy.
This part applies to all PENDAs whether they are designed, manufactured on a one-off basis or fully standardized and manufactured in quantity.
The manufacture and/or assembly may be carried out other than by the original manufacturer (see 3.10.1 of GB/T 7251.1-2013).
This part does not apply to individual devices and self-contained components such as motor starters, fuse switches, electronic equipment, etc. which comply with the relevant product standards.
This part does not apply to specific types of ASSEMBLIES covered by other parts of GB/T 7251 series
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.
Chapter 2 of GB/T 7251.1-2013 applies except as follows.
Addition:
GB/T 7251.12013
GB/T 7251.5-2017 The following standards are cited：
GB/T 7251.5-2017 Cited by the following standards：
