Identifying an electrical fault is not a guessing game—it’s a precise technical process that relies on the right tools in the hands of a trained professional. At RCD Electrical, we use a wide range of specialist diagnostic instruments to detect faults quickly, accurately, and safely.
Whether it’s a buzzing socket, tripping circuit, or a total blackout, our NICEIC-certified engineers are equipped with the latest tools to identify the root cause and provide immediate solutions for properties across London.
Let’s take a look at the essential equipment we use to deliver fault-finding excellence.
1. Multimeter – The Electrician’s Everyday Essential
The multimeter is one of the most commonly used tools in electrical diagnostics. It measures:
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Voltage (AC/DC)
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Current (amperage)
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Resistance (ohms)
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Continuity testing
A digital multimeter helps our engineers check whether current is flowing as it should or if there's a break or short in the circuit. It’s ideal for testing sockets, switches, and appliance connections.
2. Insulation Resistance Tester
This device tests the quality of insulation between electrical conductors. It applies a high voltage and measures leakage current—essential for identifying:
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Worn or deteriorated wiring insulation
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Moisture ingress in cables
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Risk of short circuits or electrocution
We use this tool regularly during fault finding and Electrical Installation Condition Reports (EICRs).
3. Socket Tester
Quick and reliable, the socket tester checks for correct wiring of outlets. In a matter of seconds, it can identify:
It’s particularly useful for fast initial inspections in domestic or rental properties.
4. Clamp Meter (Current Tester)
A clamp meter allows electricians to measure current flowing through a conductor without breaking the circuit. This is especially helpful for:
It wraps around a cable and gives live readings—ideal for diagnosing problems in distribution boards or larger systems.
5. Thermal Imaging Camera
Some electrical faults generate heat long before they cause failure. A thermal imaging camera detects:
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Overheating components
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Loose connections
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Imbalanced loads
This non-contact tool provides a visual heat map of the system, highlighting areas of concern that aren’t visible to the naked eye. It’s especially useful in commercial and high-load environments.
6. Voltage Tester (Non-Contact)
This tool detects the presence of voltage without physical contact with wires or terminals. Our engineers use it to quickly determine whether circuits are live—especially before performing safe isolation during repairs.
7. RCD Tester
To ensure Residual Current Devices (RCDs) are functioning properly, we use an RCD tester. It applies a test current and checks how quickly and effectively the device trips. Properly functioning RCDs are vital for:
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Preventing electric shocks
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Shutting off power in case of leakage
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Meeting safety regulations
8. Continuity Tester
A basic yet essential tool that checks whether an electrical path exists between two points. It’s commonly used to:
Continuity testing is a fundamental part of all fault-finding processes.
9. Circuit Tracer or Cable Locator
In complex installations—especially in older homes or commercial premises—finding a faulted cable behind walls or floors is challenging. That’s where a circuit tracer comes in. It helps us locate:
This tool saves time and avoids unnecessary damage to walls or ceilings.
10. Test Lamps
Still used by experienced electricians for reliable voltage presence checks, test lamps are simple but effective. Unlike some electronic devices, they show a clear indication of live voltage and are especially helpful in dim environments.
The RCD Electrical Difference
Fault finding is more than just equipment—it’s the expertise to interpret the data, spot issues others might miss, and apply safe, lasting solutions. That’s where RCD Electrical stands apart:
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NICEIC-Approved Electricians
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Fully Equipped with Calibrated Tools
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Up-to-Date with BS 7671 Wiring Regulations
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Rapid Response Across London
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Clear, Transparent Reporting
Whether you’re a homeowner with flickering lights or a business manager dealing with unexplained outages, RCD Electrical has the right tools and the right people for the job.
Need Fault Finding? Call the Experts
We provide certified electrical diagnostics and fast repairs across London. Don’t leave safety to chance.
Call: 02034882928
Email: info@rcdelectrician.co.uk