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Assembly of a three-phase distribution panel with general IDR and DPS - TT Always consult the NBR 5410 standards, especially in the items below: 5.1.2.2.3.3 – 6.3.5.5.2.2 – 6.3.5.2.1 – Figure 13 – Notes a) b) c) d) – 6.3.5.2.6 – 5.1.2.2.4.3 – TT diagram – All circuits must have IDR.