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Three-way junction box
Body Material: Ductile Iron Grade: GGG40 / GGG50 (QT400-15 / QT500-7)
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Three-way junction box
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Description
1. Material and Manufacturing Process
- Body material: Ductile cast iron grade: GGG40 / GGG50 (QT400-15 / QT500-7).
- Manufacturing process: sand casting or coated-sand casting, ensuring surface flatness.
- Heat Treatment: Annealing is performed to relieve casting stresses, ensuring dimensional stability and mechanical strength.
2. Mechanical Properties
- Tensile strength: ≥400 MPa.
- Elongation: ≥15% (a core advantage of ductile cast iron, providing excellent seismic and drop resistance).
- Hardness: 130–180 HB.
3. Protection and Surface Treatment
- Anti-corrosion treatment: Hot-dip galvanizing , compliant with ISO 1461, with an average zinc coating thickness of ≥86 μm.
- Protection rating: IP66 / IP67 (with silicone sealing gasket).
- Explosion-proof rating: Ex d IIB/IIC T6 Gb (if operating in an explosive environment).
4. Specifications and Parameters
- Thread types: Optional G (PF), NPT, or M (Metric), customized according to the customs of the export region.
- Wall thickness: 5 mm–8 mm (heavy-duty design).
- Grounding Protection: Stainless steel M5/M6 grounding screws are provided both inside and outside the enclosure.
- Sealing: Embedded sealing groove design, paired with aging-resistant EPDM or silicone gaskets.
5. Application Standards
- Electrical standards: Comply with the technical specifications for hardware used in high-voltage transmission lines.
- Quality Management System: ISO 9001:2015.
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