1 Scope
This part of GB 3836 contains specific requirements for the construction, testing and marking of electrical equipment, parts of electrical equipment and Ex components in the type of protection powder filling “q”, intended for use in explosive gas atmospheres.
NOTE: Electrical equipment and Ex components protected by powder filling “q” may contain electronic circuits, transformers, protection fuses, relays, intrinsically safe electrical apparatus, associated electrical apparatus, switches, etc.
This standard supplements the requirements of electrical equipment in the type of protection powder filling “q” of GB 3836.1, and applies to electrical equipment, parts of electrical equipment and Ex components with:
-a rated supply current less than or equal to 16 A;
-a rated supply voltage less than or equal to 1 000 VA, and the connecting input voltage is not exceed 1000 V;
2 Normative References
The following documents contain provisions which, through reference in this Part of GB 3836, constitute provisions of this standard. For dated references, subsequent amendments to (excluding amending error in the text), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest edition of these documents is applicable. For undated references, the latest edition of the normative document is applicable to this standard.
1 Scope
2 Normative References
3 Terms and Definitions
3.1 Powder Filling "q"
3.2 Filling Material
3.3 Externally Applied Maximum Voltage" Um"
3.4 Working Voltage
3.5 Creepage Distance
3.6 Creepage Distance under Coating
3.7 Distance through Filling Material
3.8 Infuse Rating "Im"
4 Constructional requirements
4.1 Enclosure
4.2 Filling Material
4.3 Distances
Table 1 Distances through the Filling Material
4.4 Material Usage
4.5 Cable Entry and Insulating Sleeve
4.6 Capacitors
4.7 Temperature Limitations
4.8 Fault Conditions
Table 2 Creepage Distances and Distances through Filling Material
5 Verifications and Tests
5. 1 Type Verifications and Tests
5.2 Routine Verifications and Tests
6 Marking
Figure 1 Test Apparatus for the Dielectric Strength Test of the Filling Material
