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Installing the Apollo GEM Current Sensor
The Apollo GEM current sensor is an opening clamp type sensor that is clamped around the
meter tail cable between the main utility meter and the consumer unit.
The current sensor together with the controller measure the power being imported to or
exported from the building.
The sensor can be clamped to the meter tail at any convenient location. In many cases the sensor
can be inside the consumer unit itself. The sensor however must be located upstream of the PV
system connection. If the PV system is connected to the main consumer unit then the current
sensor may be clamped round the incoming supply to the consumer unit.
If the PV system is connected via a “Henley Block” in parallel with the consumer unit then the
sensor must be clamped round the incoming supply between the meter and the Henley Block.
ENSURE THAT THE CLAMP IS FIRMLY “CLICKED” SHUT AROUND THE CABLE
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GEM-D Installation Manual
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