5.1.5 Test procedure For equipment

5.1.5 Test procedure For equipment having a protective earthing connection or aFUNCTIONAL EARTHING connection, terminal A of the measuring instrument is connected via measurement switch "s" to the main protective earthing terminal of the EUT, with the earthing conductor switch "e" open.The test is also conducted, on all equipment, with terminal A of the measuring network connected via measurement switch "s" to each unearthed or non-conductive accessible part and each unearthed accessible circuit, in turn, with the earthing conductor switch "e" closed. Additionally: − for single-phase equipment, the tests are repeated in reverse polarity (switch "p1"); − for three-phase equipment, the tests are repeated in reverse polarity (switch "p1") unless the equipment is sensitive to phase sequence. When testing three-phase equipment, any components used for EMC purposes and connected between line and earth are disconnected one at a time; for this purpose, groups of components in parallel connected through a single connection are treated as single components. Each time a line-to-earth component is disconnected the sequence of switch operations is repeated. NOTE Where filters are normally encapsulated, it may be necessary to provide an unencapsulated unit for test or to simulate the filter network. For each placement of the measuring instrument, any switches in the PRIMARY CIRCUIT and likely to be operated in normal use are open and closed in all possible combinations. After applying each test condition, the equipment is restored to its original condition, that is without fault or consequential damage.