myenergi support guide
Understanding the Grid CT Clamp
Discover what a grid CT clamp does, why it is essential to your myenergi system, and how it supports safe and efficient energy management.
Watch it explained
Grid CT Clamps Explained
Watch this short video which explains how the grid CT clamp works and why it’s required across the myenergi ecosystem.
While this video is GLO specific, the same rules apply to all myenergi devices.
The basics
What is a Grid CT Clamp?
A Current Transformer (CT) clamp is a small sensor that measures the electrical current flowing through your main supply cable. It tells your myenergi devices how much energy you are importing from or exporting to the grid.
Measures current
Fitted around the live or neutral conductor at your main supply.
Tracks energy flow
Measures import and export power in real time.
Supports smart control
Allows myenergi devices to adjust their behaviour automatically.
Why it matters
Why fitting a Grid CT Clamp is essential
Explore the three reasons why the grid CT is an essential part of your myenergi installation.
Safety
The grid CT ensures your devices work safely by providing accurate data on your household load. Without it, your system cannot manage grid import and export correctly, which can lead to overloading or device faults.
System performance
Smart features like ECO charging, solar diversion, and load balancing rely on grid CT data. Without it, devices such as zappi or eddi may show “Check Grid CT” errors and stop operating efficiently.
Compliance and correct operation
Each phase of your supply requires one correctly positioned grid CT clamp. Fitting multiple or misplaced clamps leads to inaccurate readings and potential system errors.
Installer guidance
Installation guidance
The grid CT must be positioned and fitted correctly to ensure your myenergi device can measure power flow accurately.
- Fit the clamp on the live or neutral tail at the main meter point.
- Ensure the arrow points towards the consumer unit (if fitted on live).
- Use only one grid CT per phase.
- Secure the clamp fully and ensure a clean, solid connection.
- For three-phase systems, fit one clamp per phase.
Incorrect installation
If fitted incorrectly, your myenergi device will not be able to measure power flow correctly and may not control load as expected.
Remember
Key takeaways
- Always fit a grid CT clamp. It is mandatory for all myenergi systems.
- It provides the data needed for safe, smart energy management.
- Incorrect installation causes faults and reduces performance.
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