CT (Current Transformer) metering is the method of measuring electrical current using current transformers connected to metering devices.

These systems are essential in:

• High-current applications (where direct connection to a meter isn’t practical or safe)
• Industrial and commercial installations
• Energy monitoring for efficiency and cost allocation
• Compliance with utility and regulatory metering standards

CT metering is more complex than standard single-phase or direct metering because it involves:

• Selecting correct CTs (ratio, accuracy class)
• Correct wiring of CTs and voltage circuits
• Understanding metering configurations (e.g. 2-wire vs 3-wire vs 4-wire)
• Ensuring safety and compliance with standards (IEC, BS requirements)
• Interpreting metering data for billing, diagnostics, and energy management