General consideration regarding fault – find, tests and maintenance in the installations in hazardous areas

The main topic of this paper is to analyse the approach fault – finding, tests and maintenance regarding on what shall not be done in an installation hazardous area from point view explosion protection safety. For a it usual investigated by following logical routine. This one possible ways proceeding developed good engineering practice experience general terms. test equipment for use will either certified or uncertified. SR EN 60079 17 starting requirements.