GB/T 3836.3-2021
Explosive atmospheres—Part 3：Equipment protection by increased safety“e” (English Version)

Standard No.

GB/T 3836.3-2021

Language

Chinese, Available in English version

Release Date

2021

Published By

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China

Latest

GB/T 3836.3-2021

Replace

GB 3836.3-2010

Scope

This document specifies the design, construction, inspection and marking requirements for electrical equipment and Ex components for explosive gas atmospheres protected by increased safety type "e". The degrees of protection for increased safety "e" electrical equipment and Ex components are: a) protection class "eb" (EPL "Mb" or "Gb"); or b) protection class "ec" (EPL "Gc"). "eb" protection level applies to equipment or Ex components, including their connections, conductors, windings, lamps and batteries, but does not include semiconductor or electrolytic capacitors. Note 1: The "eb" protection level does not apply to electronic components such as semiconductors or electrolytic capacitors, because if the internal isolation distance is not used, the expected failure will cause excessive temperatures or arcs and sparks. It is often not practical to maintain internal isolation distances and the functionality of electronic components. The "ec" protection class applies to equipment or Ex components, including their connections, conductors, windings, lamps and batteries, and also includes semiconductors and electrolytic capacitors. Note 2: The "ec" protection class allows the use of electronic components such as semiconductors or electrolytic capacitors, because they are rated under normal conditions and expected frequent occurrences, which are unlikely to cause excessive temperatures or arcing and sparking. . Since the isolation distance requirement does not apply to the internal structure, ordinary electronic components can usually be used if the external isolation distance meets the requirements. Unless otherwise stated, the requirements of this document apply to two levels of protection. For the "eb" protection level, this document applies to electrical equipment with a rated voltage not exceeding 11kV (AC RMS or DC). For the "ec" protection class, this document applies to electrical equipment with a rated voltage not exceeding 15kV (AC RMS or DC). Note 3: The movement of the connectors caused by the mechanical stress caused by the short-circuit current flowing through the increased safety main circuit connectors will not cause significant danger to the ignition of explosive gas atmospheres. Common industry standards require consideration of the impact of short-term high-intensity currents on the reliability of connectors. The presence of an explosive gas atmosphere does not have a serious impact on the reliability of the connection. Note 4: Any short-term thermal excursions due to current excursions higher than the nominal rated current (e.g. during motor starting) are not considered to be significant due to the relatively short duration of the event and the convective transfer generated during the event. Creates a significant risk of igniting an explosive gas atmosphere. Note 5: High-voltage connections and associated connecting lines (above 1kV) may be susceptible to locally increased discharge activity that may become a source of ignition. The typical solution is to increase the distance from the ground surface or other connection, and the terminal is equipped with a suitable high voltage strain relief. This document is a supplement and modification to the general requirements of GB/T 3836.1. When the requirements of this document conflict with the requirements of GB/T 3836.1, the requirements of this document take precedence.

GB/T 3836.3-2021 Referenced Document

• GB/T 1040.2 Plastics—Determination of tensile properties—Part 2: Test conditions for moulding and extrusion plastics*， 2022-07-11 Update
• GB/T 1312 Lampholders for tubular fluorescent lamps and starterholders*， 2022-04-15 Update
• GB/T 755 Rotating electrical machines—Rating and performance

GB/T 3836.3-2021 history

• 2021 GB/T 3836.3-2021 Explosive atmospheres—Part 3：Equipment protection by increased safety“e”
• 2010 GB 3836.3-2010 Explosive atmospheres.Part 3:Equipment protection by increased safety "e"
• 2000 GB 3836.3-2000 Electrical apparatus for explosive gas atmospheres-Part 3:Increased safety "e"
• 0000 GB 3836.3-1983

GB/T 3836.3-2021 Explosive atmospheres—Part 3：Equipment protection by increased safety“e” has been changed from GB 3836.3-2010 Explosive atmospheres.Part 3:Equipment protection by increased safety "e".

GB/T 3836.3-2021 -All Parts