Chapter A General rules of electrical installation design

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N38 © Schneider Electric - all rights reserved N - Characteristics of particular sources and loads Lamp power (W) Fig. N52 : Fluorescent tubes with electronic ballast - Vac = 230 V Protection of lamp circuits: Maximum number of lamps and MCB rating versus lamp type, unit power and MCB tripping curve During start up of discharge lamps (with their ballast), the inrush current drawn by each lamp may be in the order of: b 25 x circuit start current for the first 3 ms b 7 x circuit start current for the following 2 s For fluorescent lamps with High Frequency Electronic control ballast, the protective device ratings must cope with 25 x inrush for 250 to 350 µs. However due to the circuit resistance the total inrush current seen by the MCB is lower than the summation of all individual lamp inrush current if directly connected to the MCB. The tables below (see Fig. N52 to NXX) take into account: b Circuits cables have a length of 20 meters from distribution board to the first lamp and 7 meters between each additional fittings. b MCB rating is given to protect the lamp circuit in accordance with the cable cross section, and without unwanted tripping upon lamp starting. b MCB tripping curve (C = instantaneous trip setting 5 to 10 In, D = instantaneous trip setting 10 to 14 In). Number of lamps per circuit 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 MCB rating C & D tripping curve 14/18 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 14 x2 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 14 x3 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 10 10 10 14 x4 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 10 10 10 10 18 x2 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 18 x4 6 6 6 6 6 6 6 6 6 6 6 6 6 10 10 10 10 10 10 10 21/24 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 21/24 x2 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 28 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 28 x2 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 10 10 10 35/36/39 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 35/36 x2 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 10 10 10 10 10 38/39 x2 6 6 6 6 6 6 6 6 6 6 6 6 10 10 10 10 10 10 10 10 40/42 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 40/42 x2 6 6 6 6 6 6 6 6 6 6 6 10 10 10 10 10 10 10 10 16 49/50 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 49/50 x2 6 6 6 6 6 6 6 6 6 6 10 10 10 10 10 10 16 16 16 16 54/55 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 10 10 54/55 x2 6 6 6 6 6 6 6 6 10 10 10 10 10 10 16 16 16 16 16 16 60 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 10 10 10 10 Lamp power (W) Number of lamps per circuit 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 MCB rating C & D tripping curve 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 9 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 11 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 13 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 14 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 15 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 16 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 17 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 18 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 20 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 21 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 23 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 25 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 10 Fig. N53 : Compact fluorescent lamps - Vac = 230 V 4 Lighting circuits Schneider Electric - Electrical installation guide 2008
N - Characteristics of particular sources and loads Lamp power (W) 4 Lighting circuits Number of lamps per circuit 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 MCB rating C tripping curve 50 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 10 10 10 10 80 6 6 6 6 6 6 6 6 6 6 10 10 10 10 10 10 10 16 16 16 125 6 6 6 10 10 10 10 10 10 10 10 16 16 16 16 16 16 16 20 20 250 6 10 10 16 16 16 16 16 16 20 20 25 25 25 32 32 32 32 40 40 400 6 16 20 25 25 32 32 32 32 32 32 40 40 40 50 50 50 50 63 63 1000 16 32 40 50 50 50 50 63 63 - - - - - - - - - - - MCB rating D tripping curve 50 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 10 10 10 10 80 6 6 6 6 6 6 6 6 6 6 10 10 10 10 10 10 10 16 16 16 125 6 6 6 6 6 6 10 10 10 10 10 16 16 16 16 16 16 16 20 20 250 6 6 10 10 10 10 16 16 16 20 20 25 25 25 32 32 32 32 40 40 400 6 10 16 16 20 20 25 25 25 32 32 40 40 40 50 50 50 50 63 63 1000 10 20 25 32 40 40 50 63 63 - - - - - - - - - - - Fig. N54 : High pressure mercury vapour (with ferromagnetic ballast and PF correction) - Vac = 230 V Lamp power (W) Number of lamps per circuit 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 MCB rating C tripping curve Ferromagnetic ballast 18 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 26 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 35/36 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 55 6 6 6 6 6 6 6 6 6 6 6 6 6 10 10 10 10 10 10 10 91 6 6 6 6 6 6 6 6 6 10 10 10 10 10 10 10 16 16 16 16 131 6 6 6 10 10 10 10 10 10 10 10 10 16 16 16 16 16 16 16 20 135 6 6 6 10 10 10 10 10 10 10 10 16 16 16 16 16 16 20 20 20 180 6 6 10 10 10 10 10 10 16 16 16 16 20 20 20 20 25 25 25 25 Electronic ballast 36 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 55 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 66 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 10 10 10 91 6 6 6 6 6 10 10 10 10 10 10 10 10 10 10 10 16 16 16 16 MCB rating D tripping curve Ferromagnetic ballast 18 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 26 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 35/36 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 55 6 6 6 6 6 6 6 6 6 6 6 6 6 6 10 10 10 10 10 10 91 6 6 6 6 6 6 6 6 6 6 10 10 10 10 10 10 16 16 16 16 131 6 6 6 6 6 6 6 10 10 10 10 10 16 16 16 16 16 16 16 20 135 6 6 6 6 6 6 10 10 10 10 10 16 16 16 16 16 16 20 20 20 180 6 6 6 6 10 10 10 10 16 16 16 16 20 20 20 20 25 25 25 25 Electronic ballast 36 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 55 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 66 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 10 10 10 91 6 6 6 6 6 6 6 6 6 10 10 10 10 10 10 10 16 16 16 16 Fig. N55 : Low pressure sodium (with PF correction) - Vac = 230 V Schneider Electric - Electrical installation guide 2008 N39 © Schneider Electric - all rights reserved
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General rules of electrical install
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2 3 4 Chapter H LV switchgear: func
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Chapter A General rules of electrical installation design

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