What's the difference between the acceptance standard of distribution engineering installation in Thailand and that in China?

Thailand's power distribution project installation and acceptance standards are based on the Thai Industrial Standard (TISI), while China is based on GB series national standards, such as GB 50168-2018 "Cable Line Construction and Acceptance Standard for Electrical Equipment Installation Project". The differences between the two countries in the installation and acceptance standards of power distribution projects are mainly reflected in the following aspects:

Standard system

Thailand: Mainly based on TISI and related international standards. Thailand has its own standard system for electrical products and installation projects, such as Tis 11-2553 (standard for wires and cables), Tis 813 (standard for low-voltage power cables) and Tis 129 (standard for high-voltage power cables and other types of wires).

China: There are perfect and systematic national standards, such as GB 50303-2015 Code for Acceptance of Construction Quality of Building Electrical Engineering and GB 50168-2018 Standard for Construction and Acceptance of Cable Lines in Electrical Device Installation Engineering, which specify all aspects of electrical device installation in detail.

Electrical equipment installation

Foundation section steel:

China: The allowable deviation of the straightness of foundation steel installation shall not exceed 1mm per meter and the total length shall not exceed 5 mm; The allowable deviation of levelness per meter is 1mm, and the total length is 5 mm; The total length of position deviation and non-parallelism shall not exceed 5 mm.

Thailand: At present, no clear and unified numerical requirements of similar standards have been found, but they will be implemented according to relevant international standards or specific engineering design requirements in actual acceptance, and there may be some differences.

Power distribution cabinet (box):

China: The allowable deviation of the verticality of the cabinet installation should not be greater than 1.5‰, the joint between them should not be greater than 2mm, and the deviation of the disk surfaces in rows should not be greater than 5mm.

Thailand: It is also possible to refer to international standards. In some projects, the requirements may be similar, but the specific values and strictness may be different, and there may be more detailed classification standards for different types of distribution cabinets (boxes).

Line laying

Cable line:

China: There are detailed standards for the bending radius, laying mode and cable head fabrication of cables, such as the buried depth of cable conduit, the number of cable laying layers on the bracket and bridge, etc.

Thailand: There are strict requirements on cable material and insulation performance, such as the material, design and manufacture of wires and cables in Tis 11-2553 standard. However, the specific process and parameter requirements of cable laying are different from those in China standard, such as the installation angle and fixed spacing of cable trays.

Overhead line:

China: There are clear numerical standards and acceptance specifications for the buried depth and verticality of poles, sag of conductors, phase-to-phase distance and ground distance.

Thailand: The acceptance of overhead lines also pays attention to safety and performance, but it may be different from China in specific numerical requirements and acceptance details, for example, there will be different emphasis in considering the influence of local climatic conditions on overhead lines.

Grounding system

Grounding resistance:

China: According to different types and environments of power distribution projects, there are clear requirements for the maximum grounding resistance. Generally, the grounding resistance is not greater than the design requirements, usually 4Ω or 10Ω.

Thailand: There are also requirements for grounding resistance, but the specific numerical standards may be different due to different engineering types and local soil conditions, and relevant standards such as IEC may be referred to.

Ground wire:

China: The material, specification and connection mode of grounding wire are specified. It is required that the grounding wire should be connected firmly and reliably, without looseness or fracture, and it should be convenient for inspection and maintenance.

Thailand: There are similar requirements in the material and connection reliability of grounding wire, but there may be differences in the specific connection technology and marking requirements, such as the marking color and marking method of grounding wire may be different from China.

Safety protection

Protective device:

China: The doors and windows of the power distribution room are opened outwards, and safety protection devices such as fences should be installed. The protective doors should be closed and locked normally to prevent people from touching live equipment by mistake.

Thailand: It also attaches importance to the safety protection of power distribution room, and requires necessary protective devices, but there may be different regulations on the material of protective doors, the height and spacing of protective fences, etc.

Safety signs:

China: Clear safety signs are set inside and outside the power distribution room, such as "High Voltage Danger" and "No Closing", and the phase sequence signs and operation signs on the equipment are clear and accurate.

Thailand: There are similar requirements for safety signs, but the color, shape and text expression of the signs may be different due to local culture and standards.