Electrical Training Keith Bail FSCTE – Trainer and Consultant KB Consultancy.
n IEC 60479-1:2018-TC Effects of current on human beings and livestock. n BS EN/IEC 62305-4:2006 Lightening Protection Systems. n BS EN IEC 62368-1:2024+A11:2024. It is the responsibility of CAI members to install safe systems and to this end they must comply with the above. One fundamental outcome of investigations in the development of the electrical safety code was that Class 11 electrical equipment, although not requiring an earth connection, can have an a.c. voltage (up to 110v) present on exposed metalwork, such as aerial sockets or even, in some instances, the case of the equipment itself. If that metalwork is touched while the equipment is live this voltage will cause a small current (a touch current) to flow through the person. Touch voltage is the voltage between simultaneously accessible metal parts. The current which will flow when accessible metal parts are connected, either by cables, equipment or the human body. Standards including IEC 62368-1 define the maximum allowable touch current. Some devices (IT) are limited to 0.25 mA RMS, others (AV) 0.5 mA RMS. On their own a single device touch current will cause no harm other than a slight tingle; you may have experienced this ‘tingle’ especially when outside up a ladder connecting an LNB in the rain. However, as more devices are connected
CAI introduced Electrical Safety Training in May 2009 following the introduction of the Codes of Practice 03 Electrical Safety in Signal Reception Systems (excluding CATV), first issued May 2009. The CAI Technical Committee created this code to provide an interpretation of the current and relevant British and IEC standards and best practices. The main document governing the Cop03 is BS EN IEC 60728-11 (Cable networks for television signals, sound signals and interactive services – Safety). Compliance with this code ensures the prevention of injury either to a system user or any installation or maintenance personnel due to the risk of hazardous voltages becoming present on that distribution system. “Do not electrocute anyone and be sure you do not get electrocuted!” There are other standards and requirements legally binding accounted for within the code, the latest versions of these are: n Low Voltage Directive (LVD 2014/34/EU). n Electricity at Work Regulations 1989. n Health and Safety Directive (HSW Act 1974). n BS EN 7671:2018+A2:2022 Wiring Regulations. n IEC 62368-1:2018 Safety Standard for ICT and AV Equipment. n IEC 60990:2016 Methods of measurement of touch currents.
48 CAI Feedback Winter 2025
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