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Launch of our new factfile on arc flash risk management

Former Community Member
Former Community Member

We published a new factfile on Arc flash risk management.

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This factfile seeks to set out the key principles of arc flash risk management using a risk-based approach. It is aimed at persons with responsibility for the management of safety in the control and implementation of work on electrical power equipment. This factfile provides an assessment process and there is also a commentary on recognised standards and test methods for PPE in Appendix 2.

We are interested in your thoughts! Please read our factfile and ask any questions or share your thoughts below.

 

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    mapj1: 
     

    the conversion between Joules and calories is not linear with temperature.

     

    No, it isn't, but the effect is frankly piddly, the various calories are named after the temperature of the test.

    The most common “15° calorie” (also called the gram-calorie, or small calorie) was defined back when the UK recognised such units as the amount of heat that will raise the temperature of 1 gram of water from 14.5° to 15.5°C—equal to 4.1855 joules. Other less common definitions in this series were the 20° calorie (4.18190 joules) from 19.5° to 20.5° C; and the “mean calorie” (4.19002 joules) defined as 1/100 of the heat necessary to raise the temperature of 1 gram of water from 0° to 100°C.

    We are looking at arc flash temperatures of between, perhaps sometimes exceeding, 2800 and 19000 deg C.

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  • 0

    mapj1: 
     

    the conversion between Joules and calories is not linear with temperature.

     

    No, it isn't, but the effect is frankly piddly, the various calories are named after the temperature of the test.

    The most common “15° calorie” (also called the gram-calorie, or small calorie) was defined back when the UK recognised such units as the amount of heat that will raise the temperature of 1 gram of water from 14.5° to 15.5°C—equal to 4.1855 joules. Other less common definitions in this series were the 20° calorie (4.18190 joules) from 19.5° to 20.5° C; and the “mean calorie” (4.19002 joules) defined as 1/100 of the heat necessary to raise the temperature of 1 gram of water from 0° to 100°C.

    We are looking at arc flash temperatures of between, perhaps sometimes exceeding, 2800 and 19000 deg C.

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