Bimetallic Connections and Corrosion Control is an advanced technical guide for consultants, EPC contractors, government buyers, project engineers and facility teams.
Technical Purpose
This subject should be coordinated with air termination, down conductors, earth termination, equipotential bonding and surge protection. A standalone product or resistance value does not represent a complete lightning protection design.
Inputs
Structure geometry, electrical SLD, exposed services, soil information, occupancy and consequence of failure.
Outputs
Calculations, drawings, BOQ, method statement, inspection plan and handover documents.
Installation
Compatible materials, direct routes, secure supports, test access, corrosion control and civil coordination.
Verification
Visual inspection, continuity, earth tests, SPD checks, photographs and as-built records.
Engineering Considerations
The applicable standard, protection level, design method and material system should be identified before quantities are finalised. Drawings should show plans, sections, conductor paths, bonding points and test locations.
Commercial and Technical Keywords
Typical BOQ Framework
| Group | Scope | Review |
|---|---|---|
| Design | Survey, calculations, drawings and BOQ | Project specific |
| Materials | Conductors, terminals, joints, electrodes and SPDs | Compatibility |
| Installation | Routing, fixing, bonding and labelling | Approved method |
| Testing | Continuity, earth tests and SPD checks | Traceable records |
| Handover | As-built drawings, warranty and O&M | Complete documentation |
Common Mistakes
- Using generic quantities without drawings.
- Ignoring rooftop equipment or incoming services.
- Mixing metals without corrosion control.
- Covering concealed work before inspection.
- Not updating as-built documentation.
Inspection and Maintenance
Review mechanical security, continuity, corrosion, bonding, test access and SPD status. Major lightning events or site modifications should trigger a focused inspection.
Frequently Asked Questions
Can final quantities be prepared without drawings?
Only provisional quantities can be estimated. Final quantities should follow approved plans and routes.
Is low earth resistance alone sufficient?
No. Bonding, current sharing, continuity and surge protection are also essential.
What is required at handover?
As-built drawings, tests, photographs, warranty and maintenance instructions.
Related Advanced Guides
Engineering Support
Share drawings, dimensions, SLD and tender specification for a project-specific review.
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