C1 - There is a danger present, risk of injury and immediate remedial action required; C2 - There is a potential danger present and urgent remedial work is required; C3 - Improvement is recommended; Issuing codes. It is not hard to find discussions between electricians on line who are reluctant to issue a C2 code.
C1 - Very low. Heated buildings with clean atmosphere. In this environment you can use untreated steel or painted steel. The C1 class includes materials that are not exposed to corrosion in normal atmospheric air. This can be: Schools; Shops; Hotels; C2 - Low. Atmosphere with little or no degree of pollution. Country atmosphere where
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examples of c1 c2 c3
