Apollo GEM Power Sensor (CT) clamp installation

Apollo GEM Power Sensor (CT) clamp installation
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 on the incoming meter tail. 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 as shown below:
Sensor
Clamp
Inverter
PV System
Isolator
This Side
Facing Grid
Label
Supply
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 as shown:
Sensor
Clamp
Henley
Block
Inverter
This Side
Facing Grid
Label
Supply
PV Consumer Unit
Notes:
1.
ENSURE THAT THE CLAMP IS FIRMLY “CLICKED” SHUT AROUND THE CABLE
2.
If Required the clamp can be placed on the neutral conductor, however the direction of the
clamp must be reversed:
Inverter
PV System
Isolator
This Side
Facing Grid
Label
Supply
The current sensor clamp when installed on the live conductor is positioned with the label “This side facing grid
supply” facing towards the incoming supply.
If it is more convenient, the sensor can be installed on the neutral supply cable instead of the live. In this case the label
“This side facing grid supply” should face away from the incoming supply.
3.
Cable size The cable aperture in the sensor is 16mm which can accommodate a cable size up to 35mm2
Standard meter tails are usually 25mm2 or 16mm2
Note that the clamp does not need to be a tight fit on the cable. The sensor works by sensing the magnetic
field produced by the cable which does not depend of the cable diameter.
OK
4.
OK
Sensor cable Length As standard the sensor cable length is 3M. If required the sensor cable length
can be extended up to 100M in length without affecting the sensor accuracy.
If extending the sensor cable, use a 2-core cable of 0.5mm2 wire size or larger.
Apollo Solar Electric Ltd
Burnt Thorns
Kilsby Lane
Rugby
CV21 4PN
Tel: 01788 511055
Fax: 0 1788 511078
sales@apollosolarelectric.co.uk