Complete Lightning Protection Systems, built to last.

Yes, considerably. The granitic and quartzite bedrock common across the Johannesburg-Pretoria corridor produces soils with high electrical resistivity. High-resistivity soil makes it physically difficult for an electrode to “spread” its ground current effectively, meaning more electrode length, different configurations, or chemical soil treatment are required to achieve the low-resistance values that compliant earthing demands. This is one of the most common points of failure in lightning protection systems installed by non-specialist contractors — they install standard electrode designs without measuring soil resistivity and without verifying that the resulting resistance meets the standard. At HHK, soil resistivity measurement is the first step of every earthing design.

Yes. HHK’s Johannesburg branch manages multi-site protection programmes for large corporate clients, with coordinated design standards, consistent documentation, and scheduled maintenance visits across multiple properties. We provide consolidated compliance reporting that simplifies your internal audit and insurance renewal processes. For financial sector clients with specific cybersecurity frameworks that include physical infrastructure compliance, we can tailor our documentation to meet those requirements.

As early as possible — ideally at the point where civil engineering drawings are being finalised. Early engagement allows the earthing electrode array to be incorporated into the concrete slab and foundation works, which is dramatically more cost-effective than retrofitting after the building is complete. It also allows for optimal routing of down conductors and surge protection cable pathways without cutting through finished finishes. HHK can engage directly with your project engineers and quantity surveyors to ensure protection is designed in from the start.

Our compliance documentation package includes the full design specification, soil resistivity survey data, earth resistance test results (pre- and post-installation), visual inspection records, and the Certificate of Compliance. Where required, we can provide the OHS-specific documentation that Site Health and Safety Officers require for signoff — including the technical basis for the protection level selected and confirmation that the installation meets the relevant SANS standards. This documentation is referenced by OHS Act Section 10 and associated regulations governing electrical installation safety.