During some smart meter installations, engineers may temporarily move the communications hub away from the electricity meter using a test cable, sometimes called a fly lead.
Customers are often surprised that moving the hub only a short distance can dramatically improve the signal.
However, this can happen quite frequently.
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Why the communications hub sits on top of the meter
Normally the communications hub is installed directly on top of the electricity meter.
This keeps the system compact and allows the hub to connect to the meter easily.
From the outside it appears as one unit.
However, this position is not always the best location for wireless communication.
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Why interference can occur
Several factors around the meter position can weaken the signal:
• electrical equipment nearby
• metal meter cabinets
• consumer unit wiring
• metal trunking or conduits
• surrounding building materials
These objects can interfere with or block the wireless signal used by the communications hub.
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Why moving the hub helps
When engineers temporarily move the communications hub a short distance away from the meter, the signal path can improve.
Sometimes moving the hub just one or two metres can allow the signal to reach the network more clearly.
This is why engineers sometimes test different positions during installation.
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Why the signal may appear but fail during commissioning
In some situations the hub briefly detects the network but cannot maintain a stable connection.
Once commissioning begins and the hub starts sending larger amounts of data, the weak signal collapses.
Moving the hub slightly can sometimes improve the signal enough for commissioning to complete successfully.
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Why signal strength matters
The communications hub must connect to the national smart meter network in order to send readings to energy suppliers.
This network is operated by Data Communications Company.
Without a reliable connection, the smart meter may not be able to transmit readings automatically.
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What customers may notice
If the communications signal is weak, customers may see:
• estimated bills instead of actual readings
• energy apps not updating
• EV tariffs not working correctly
• solar export readings not appearing
In many cases the meter itself is still measuring energy correctly, but the communication link is unstable.