Hazardous areas and related topics - VoltiBULLETIN August 2009

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Explosive, or potentially explosive, atmospheres can be found where there is a risk of explosion through ignition of mixtures of gas, vapour or dust (even some fibres) with air. Other flammable combinations can also explode. Precisely, an explosive atmosphere is defined as a 'mixture with air, under atmospheric conditions, of flammable substances in the form of gases, vapours, mists or dusts in which, after ignition has occurred, combustion spreads to the entire unburned mixture'.

Hazardous areas and related topics - VoltiBULLETIN August 2009 13 August 2009 James Hunt Managing Editor Voltimum UK managing editor James Hunt introduces this VoltiBULLETIN on hazardous areas, related legislation, directives and training: Explosive, or potentially explosive, atmospheres can be found where there is a risk of explosion through ignition of mixtures of gas, vapour or dust (even some fibres) with air. Other flammable combinations can also explode. Precisely, an explosive atmosphere is defined as a 'mixture with air, under atmospheric conditions, of flammable substances in the form of gases, vapours, mists or dusts in which, after ignition has occurred, combustion spreads to the entire unburned mixture'. Find out more about James' monthly topic Hazardous area training courses maximise safety Hazardous areas - conduit developments open door to new approach to cable management - Kopex Electric heating for hazardous areas - Dimplex ABB expands network of Ex motor repair workshops Question: When installing a 110V socket in a hazardous area from a distribution board having a common transformer that is centre tapped to earth, what are the protection requirements for the circuit feeding the socket? And also, what are the protection requirements for feeding the transformer? Please note that the transformer is 3kVA rated. Read the answer    View our Q & A Archive    ... this month's practical snag and its solution from the NICEIC Two-way switching using the cpc Circuit protective conductors of flat twin and earth cables should not be used for any other purposes. A potentially dangerous snag is the use of the circuit protective conductor of a flat twin and earth cable as a live conductor in a two-way switching circuit. More on two-way switching using the cpc This article is extracted from Snags and Solutions Part 1 or Part 2 published by the  Back  Related contacts 3rd Floor Bishops House, 25-29 Fulham High Street, London SW6 3JH Telephone: 0207 751 3900 Fax: 0207 751 3901  For latest electrical industry news, register for Voltimum's free newsletter. Enter your email address here: OK Source: Voltimum