Writes for specifiers such as consulting engineers and building operators, also electrical plant manufacturers and thermal imaging practitioners. In two parts - 1) The Guidance Document, intended to be used with the Standard Specification. Provide relevant information, procedures and guidance under the headings: Introduction, Scope, Management, Safe working, Measuring equipment, Measuring procedures, Evaluation criteria/Interpretation of faults, Documentation, 2) The Specification Section, published separately, is the standard specification.