I
- I
- I/O
- Ignition Source
- Ignition Temperature
- Impulsive Noise
- In-Service
- In-Service Inspection
- Incendive Spark
- Incident
- Independent Protection Layer
- Indirect Measurement (BS EN 60359)
- Industrial Automation and Control System
- Information Technology
- Ingress Protection (IP Rating)
- Inhibit
- Initial Calibration
- Initiating Event
- Inspection
- Inspection Authority
- Inspection Body
- Inspector
- Installation
- Installation/Terminal
- Insulation – Basic
- Insulation – Double
- Insulation – Supplementary
- Integrated Pollution Prevention and Control
- Integrity
- Integrity Assessor
- Interlocks
- Intermediate Wind Stiffener
- Internal Floating Cover
- International Electrotechnical Commission
- International Organization for Standardization
- Internet of Things
- Intrinsically Safe
- Intrusion Detection System