Security Seals Guide
What is a Meter Seal?
Seal types used on electricity, water and gas meters.
Direct answer
A meter seal is a single-use security seal used on covers, terminals, screws or adjustment points of electricity, water, gas and similar metering equipment to make unauthorized access visible. The right meter seal is selected by considering small closure geometry, serial-number readability, long-term field durability and the utility's inspection procedure together.
What you will learn
Meter seals are designed for small and sensitive closure points.
The goal is not to physically lock the meter but to make unauthorized access evident.
Wire, thin plastic ties or dedicated locking bodies are selected for different meter geometries.
Traceability improves when the serial number is linked to the field team, meter identity and service record.
UV, temperature and material ageing should be considered for long-term outdoor installations.
What does a meter seal protect?
A meter seal is not a lock that protects the metering device itself from theft. Instead, it closes points such as terminal covers, calibration/adjustment areas or connection screws—areas intended to be opened only by authorized personnel—in a way that can later be inspected.
Its security value therefore does not come only from breaking strength. When the unique seal number is linked to the meter number, service date and technician record, physical tamper evidence becomes operational evidence.
Common meter-seal constructions
| Construction | Strength | Typical use |
|---|---|---|
| Wire + locking body | Passes through small holes and flexible routing | Terminal covers, meter screws |
| Butterfly / twist-lock | Fast application and controlled wire tightening | Electricity, water and gas meters |
| Thin one-piece plastic | Low weight and fast serial application | Suitable small covers and equipment points |
Selection points to check
- Diameter of the hole through which the wire or tie must pass
- Outdoor exposure, UV, temperature and humidity conditions
- Readability of serial number and utility identifier
- Whether technicians apply the seal with gloves and general field ergonomics
- Clear break/deformation evidence after authorized removal
Meter sealing workflow
- 1
Verify meter and work-order identity
Applying the correct seal to the wrong meter is still a record error; verify device identity first.
- 2
Record the seal number
Link the serial number to the meter, date, team and service record.
- 3
Apply through the correct route
The wire or tie must pass through a control point that actually reveals opening of the cover.
- 4
Perform final inspection
Check that the lock is fully engaged, the number is readable and no unnecessary wire slack remains.
Frequently asked questions
Which sectors use meter seals?
They are used in electricity, water and gas utilities and other infrastructure applications with metering, calibration or authorized-access points.
Does a meter seal completely prevent tampering?
No. A seal makes tampering visible and supports records; physical protection should be combined with meter boxes, inspections and other controls.
Does wire length matter?
Yes. Wire that is too short may make application impossible, while excessive length can create a large loop and increase the area available for manipulation.
Is a serial number mandatory?
Requirements vary by organization and procedure, but unique serial numbering is a strong control for linking meter, technician and work records to the physical seal.
What are meter-seal colors used for?
Colors may be used for visual coding by year, team, region or work type, but color should never replace serial-number and record verification.
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