Gary Friend, sales director Extech Safety Systems, has revised and updated his highly popular three-part article on intrinsically safe loop approval calculations, which appeared in past editions of South African Instrumentation and Control. This latest complete version includes the impact of using Ex ic (Zone 2) and gas group on cable lengths.
About the author: Gary Friend graduated with BSc Eng in 1990 in South Africa. He moved to the UK in 1992 and worked at MTL Instruments (Now Eaton MTL) for 11 years from 1995 to 2006 in various technical roles. He now manages (since 2006) Extech Safety Systems in South Africa.
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