COVER STORY
ELECTRICAL SAFETY IN THE WORKPLACE
Martindale Electric explains the importance of safe isolation and electrical equipment testing, outlining how robust procedures and the right test equipment help reduce electrical risks and improve workplace safety compliance.
Reports show that injuries from electrical accidents in the workplace are still prevalent, with true figures likely higher than statistics show due to under-reporting. Safe isolation procedures and portable appliance testing are two fundamental processes which significantly enhance safety around electricity, for both electrical workers and others in the workplace.
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Safe isolation is necessary to ensure that workers on site are not exposed to danger when working on or near live electrical systems. There have been incidents where failure to use safe isolation procedures has resulted in injury. Portable appliance testing (PAT) is the term widely used to describe the examination of electrical appliances and equipment to ensure that they are safe to use.
SAFE ISOLATION Overview
Safe isolation is a vital task which needs to be performed whenever working on an electrical installation. It ensures both the safety of those working on the installation and other tradespeople or members of the public who might be on the premises. It is important that the person who performs the isolation is trained, qualified, and up to date on the procedures necessary to perform this task. Appropriate equipment is also essential, both testing kit and electrical supply lock-off devices.
Process
The safe isolation process is a structured approach designed to confirm electrical systems are safely de- energised before maintenance or installation work takes place. It is important to ensure permission for work is in place with all relevant parties informed. The
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Using a dedicated proving unit matched to the voltage indicator is strongly recommended. This ensures all LEDs and ranges on the instrument are functioning correctly. In addition, proving units provide a safer and more convenient live source than using the mains supply directly.
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first stage involves identifying the correct breaker or switch associated with the circuit to be worked on. Once identified, the circuit must be locked off correctly, tagged appropriately, and verified dead before any work can proceed.
Once isolated and locked off, the proving dead procedure begins. This involves testing a suitable, compliant voltage indicator against a matched proving unit (giving a safe voltage output) to confirm the instrument is functioning correctly. The next stage is the voltage test itself, where the proved voltage indicator is used to check for dangerous voltage levels on the circuit to be worked on, whether single-phase or three-phase. After testing the circuit, the voltage indicator must then be proved on the proving unit again before any work starts. This final step confirms that the tester has remained functional throughout the process and that no damage or faults have developed during use.
Test equipment requirement
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Having the correct test equipment available is fundamental. There are many devices that indicate or measure voltages. Specific Voltage Indicators (VI) are the best solution for use during the isolation procedure. They must comply with the legal safety standards BS EN61243-3 and BS EN61010-1. Dedicated products such as theMartindale VI13800 voltage indicator are specifically designed to meet these requirements
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