Introduction

The Isolation Spark Gap is a critical component in surge protection systems, especially in the oil and gas industry. This device plays a vital role in providing cathodic protection to oil and gas pipelines, safeguarding them against corrosion and ensuring their longevity. Designed to protect against lightning and switching surges, the Isolation Spark Gap ensures the safety and integrity of pipeline systems. Manufactured and tested according to IEC 62561-3 standards, it guarantees high reliability and performance in harsh environments.

NBCS 2026 Compliance Explained

NBCS 2026 classifies Isolation Spark Gap installation as a conditional SHALL under Clause 8.2.24 — mandatory wherever cathodic protection systems are electrically isolated from a structure's earthing system and require surge equalization across that isolation gap.

For oil and gas pipeline operators, this means an ISG is not optional wherever cathodic protection and lightning protection systems coexist on the same structure. JMV's Isolation Spark Gap is built to meet this requirement, tested to IEC 62561-3.

Salient Features

• IEC 62561-3 Compliance: Adheres to international standards for isolation spark gaps, ensuring high quality and reliability.
• High Humidity Tolerance: Capable of withstanding relative humidity levels exceeding 95%.
• Cathodic Protection: Prevents corrosion in oil and gas pipelines by maintaining equipotential bonding.
• Surge Protection: Effective against both lightning-induced and switching surges.
• Durable Construction: Built to endure the demanding conditions of industrial environments

FAQs

Is an Isolation Spark Gap mandatory under NBCS 2026?
Yes — under Clause 8.2.24, it's a conditional SHALL wherever a cathodic protection system is isolated from a structure's earthing system and needs surge equalization.

Why does cathodic protection need an isolation spark gap?
Cathodic protection must stay isolated from earthing to work. The ISG bridges that isolation only during a lightning strike or switching surge, then resets — protecting the pipeline without breaking isolation.

What humidity conditions can JMV's ISG withstand?
Relative humidity above 95%, suitable for pipeline and offshore use.

Is JMV's Isolation Spark Gap tested to international standards?
Yes — manufactured and tested to IEC 62561-3.

Which industries use Isolation Spark Gaps?
Mainly oil and gas pipeline operators with cathodic protection, and any structure with an isolated corrosion-protection system.