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See Topics in Safety (ASE 2001), Chapter 17. Post-16 students may undertake the practical with supervision. Students should observe well away from the apparatus when it is being used. The practical work with HT supplies should only be undertaken by teachers with good knowledge of HT electricity and the dangers. All HT connections should be made with the HT switched off, and no adjustments made to the HT connections or wires once the HT is switched on. Any meter used in the HT circuit should be a type rated for the voltage used, and with shrouded connectors. The HT connectors should be the shrouded type so that accidental contact is highly unlikely. It is essential that all HT connectors and cables are rated at the voltage to be used. HT (high tension) power supplies (generally supplying voltages up to 400 V) can cause fatal electric shock.
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