Hot-dip galvanised cable trunking is steel cable trunking fabricated first and then immersed in molten zinc to form a protective zinc coating. It is commonly used to contain, protect and organise cable routes in outdoor, humid and more corrosive project environments.

The Sun manufactures hot-dip galvanised cable trunking to project dimensions, thicknesses and drawings, together with covers, joints and directional fittings.

1. What is hot-dip galvanised cable trunking?

It is enclosed steel cable trunking that is cut, punched and formed before galvanising. The fabricated product is immersed in molten zinc, coating the exposed surfaces, including many edges and fabrication details.

How is it different from pre-galvanised trunking?

Pre-galvanised sheet is coated before fabrication; hot-dip galvanised trunking is coated after fabrication. The latter is generally selected for outdoor, wet or more demanding corrosion conditions.

2. Why does zinc coating protect steel?

Zinc provides a barrier and sacrificial protection to the steel substrate. Service life depends on coating characteristics, local exposure, drainage, deposits, mechanical damage and maintenance conditions.

3. Suitable applications

Suitable for outdoor routes, factories, industrial sites, utility areas, humid locations and projects with higher corrosion exposure. Final selection should consider the actual environment, including chemicals, salt, standing water and required service life.

4. Construction and coordinated accessories

A complete system can include trunking bodies, covers, joints, bolts, bends, risers, drops, tees, crosses, reducers and supports. Accessories should be coordinated with the route dimensions and installation method.

5. Reference specifications

Item	Option
Product	Hot-dip galvanised cable trunking
Base material	Sheet steel
Finish	Hot-dip galvanised after fabrication
Form	Enclosed trunking, optional cover
Standard length	2.5 m/length
Width / height	To project requirements
Thickness	0.8, 1.0, 1.2, 1.5, 2.0 and 2.5 mm
Accessories	Bends, tees, crosses, joints and supports

Common sizes

Common sizes include 100×50, 200×50, 100×100, 200×100, 300×100 and 400×100 mm; project-specific sizes can be fabricated.

6. Selecting thickness and support spacing

Select thickness together with trunking dimensions, cable weight, support spacing and type, routing direction, future capacity and installation conditions. Wide or heavily loaded routes need a design based on load and support spacing.

7. Is coating thickness important?

Yes. Coating thickness is one factor affecting corrosion protection, but it must be considered together with base steel, galvanising quality and the exposure environment.

8. Must the finish be perfectly uniform?

Galvanised appearance can naturally vary in tone and texture. Acceptance should focus on appropriate coating coverage, product function, project requirements and areas needing repair or protection.

9. Manufacturing at The Sun

The process is cutting → punching/cutting to size → press forming → fitting fabrication → inspection → hot-dip galvanising → final inspection → packing.

10. Quality checks

Mechanical inspection

Checks include dimensions, material thickness, shape, holes, joints, fittings and quantities.

Coating inspection

Check coating coverage, visual condition, significant bare areas, handling damage and compliance with the agreed technical requirements.

11. Transport and installation notes

Protect the galvanised finish from impact and unnecessary abrasion, use compatible fasteners and supports, allow drainage, and avoid conditions that trap water or contaminants.

12. Comparison with other materials

Finish	Typical use
Hot-dip galvanised	Outdoor, wet and more corrosive conditions
Pre-galvanised steel	Economical dry indoor routes
Powder-coated steel	Indoor routes requiring colour and appearance
Stainless steel	Highly corrosive, food or chemical conditions
Aluminium	Lightweight corrosion-resistant routes

13. Quotation

Price depends on dimensions, thickness, cover, fittings, quantity, drawing requirements, galvanising and delivery conditions. Send dimensions, quantities or M&E drawings for a project quotation.

14. Made to project drawings

Provide W×H, thickness, length, covers, fittings, quantity and drawings or bill of quantities. The Sun will recommend a suitable manufacturing configuration.

Reference price information

Prices vary with material, dimensions, thickness, fittings, galvanising and quantity. Contact The Sun to confirm current quotation, delivery and lead time.

15. Frequently asked questions

Can it be used outdoors?

Yes, it is commonly selected for outdoor and humid installations, subject to evaluation of the actual exposure.

Will it rust?

The zinc coating improves corrosion resistance, but no finish is immune in every environment. Damage, deposits and aggressive exposure affect service life.