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ELECTRICAL SAFETY HANDBOOK John Cadick
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Such currents are within the output range of most power packs and are typical of contacts made through wet skin. All equipment operating on less than V DC is to be provided at least with the enclosing cover labelled 'Danger of Electric Shock' when in use and preferably to have the mains supply interrupted by a micro-switch or a physical interlock connected to the cover.
A safe system of work for electrophoresis requires that power supplies to tanks are always switched off before the lid of the tank is opened. In addition, supplementary protection by interlocking the power supply is necessary to ensure that anyone who forgets to switch off is not at risk. Effective interlocking may be provided by well shrouded sockets on the tank lid which are permanently connected to the DC supply connector and which separate from the corresponding contact pins on the tank body which are connected to the electrodes.
Thus opening the tank lid automatically removes the power.
Company fined $K over electric shock to worker | Health & Safety Handbook
There can also be power interlocking using a positive mode safety switch on a tank with a hinged lid arranged to break the AC supply to the power pack when the lid is opened. There can also be a safety interlock circuit for connection to the tank switch incorporated in the power pack itself. Simple control circuit interlocking with a safety switch to operate a contactor or relay which breaks the AC supply to the power pack when the lid is opened is not recommended.
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