Chapter A General rules of electrical installation design

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N40 © Schneider Electric - all rights reserved N - Characteristics of particular sources and loads 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 50 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 10 10 10 10 70 6 6 6 6 6 6 6 6 6 6 10 10 10 10 10 10 10 16 16 16 100 6 6 6 6 6 6 6 6 10 10 10 10 10 16 16 16 16 16 16 16 150 6 6 10 10 10 10 10 10 6 16 16 16 16 16 16 20 20 20 25 25 250 6 10 16 16 16 20 20 20 20 20 20 25 25 25 32 32 32 32 40 40 400 10 16 20 25 32 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 - - - - - - - - - - - Electronic ballast 35 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 50 6 6 6 6 6 6 6 6 6 6 6 6 6 10 10 10 10 10 10 10 100 6 6 6 6 6 6 6 6 10 10 10 10 10 10 16 16 16 16 16 16 MCB rating D tripping curve Ferromagnetic ballast 50 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 10 10 10 10 70 6 6 6 6 6 6 6 6 6 6 10 10 10 10 10 10 10 16 16 16 100 6 6 6 6 6 6 6 6 10 10 10 10 10 16 16 16 16 16 16 16 150 6 6 6 6 6 10 10 10 10 16 16 16 16 16 16 20 20 20 25 25 250 6 6 10 10 16 16 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 32 32 40 40 50 63 63 - - - - - - - - - - - Electronic ballast 35 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 50 6 6 6 6 6 6 6 6 6 6 6 6 6 10 10 10 10 10 10 10 100 6 6 6 6 6 6 6 6 10 10 10 10 10 10 16 16 16 16 16 16 Fig. N56 : High pressure sodium (with 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 35 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 70 6 6 6 6 6 6 6 6 6 6 10 10 10 10 10 10 10 16 16 16 150 6 6 10 10 10 10 10 10 10 16 16 16 16 16 16 20 20 20 25 25 250 6 10 16 16 16 20 20 20 20 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 63 63 63 63 63 63 63 63 63 63 63 1800/2000 25 50 63 63 63 - - - - - - - - - - - - - - - Electronic ballast 35 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 70 6 6 6 6 6 6 6 6 6 6 6 6 10 10 10 10 10 10 10 10 150 6 6 6 10 10 10 10 10 10 10 16 16 16 16 16 16 16 20 20 20 MCB rating D tripping curve Ferromagnetic ballast 35 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 70 6 6 6 6 6 6 6 6 6 6 6 10 10 10 10 10 10 16 16 16 150 6 6 6 6 6 10 10 10 10 16 16 16 16 16 16 20 20 20 25 25 250 6 6 10 10 16 16 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 16 20 32 32 40 50 50 63 63 - - - - - - - - - - - 1800 16 32 40 50 63 63 - - - - - - - - - - - - - - 2000 20 32 40 50 63 - - - - - - - - - - - - - - - Electronic ballast 35 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 70 6 6 6 6 6 6 6 6 6 6 6 6 10 10 10 10 10 10 10 10 150 6 6 6 6 6 6 6 10 10 10 16 16 16 16 16 16 16 20 20 20 Fig. N57 : Metal halide (with PF correction) - Vac = 230 V Lamp power (W) Fig. N58 : Metal halide (with ferromagnetic ballast and PF correction) - Vac = 400 V 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 1800 16 32 40 50 50 50 50 63 63 - - - - - - - - - - - 2000 16 32 40 50 50 50 50 63 63 - - - - - - - - - - - MCB rating D tripping curve 1800 16 20 32 32 32 32 50 63 63 - - - - - - - - - - - 2000 16 25 32 32 32 32 50 63 - - - - - - - - - - - - Schneider Electric - Electrical installation guide 2008
N - Characteristics of particular sources and loads Fig. N60 : s.i. residual current devices with immunity against impulse currents (Merlin Gerin brand) 4 Lighting circuits Overload of the neutral conductor The risk In an installation including, for example, numerous fluorescent tubes with electronic ballasts supplied between phases and neutral, a high percentage of 3 rd harmonic current can cause an overload of the neutral conductor. Figure N59 below gives an overview of typical H3 level created by lighting. Lamp type Typical power Setting mode Typical H3 level Incandescend lamp 100 W Light dimmer 5 to 45 % with dimmer ELV halogen lamp 25 W Electronic ELV 5 % transformer Fluorescent tube 100 W Magnetic ballast 10 % < 25 W Electronic ballast 85 % > 25 W + PFC 30 % Discharge lamp 100 W Magnetic ballast 10 % Electrical ballast 30 % Fig. N59 : Overview of typical H3 level created by lighting The solution Firstly, the use of a neutral conductor with a small cross-section (half) should be prohibited, as requested by Installation standard IEC 60364, section 523–5–3. As far as overcurrent protection devices are concerned, it is necessary to provide 4-pole circuit-breakers with protected neutral (except with the TN-C system for which the PEN, a combined neutral and protection conductor, should not be cut). This type of device can also be used for the breaking of all poles necessary to supply luminaires at the phase-to-phase voltage in the event of a fault. A breaking device should therefore interrupt the phase and Neutral circuit simultaneously. Leakage currents to earth The risk At switch-on, the earth capacitances of the electronic ballasts are responsible for residual current peaks that are likely to cause unintentional tripping of protection devices. Two solutions The use of Residual Current Devices providing immunity against this type of impulse current is recommended, even essential, when equipping an existing installation (see Fig. N60). For a new installation, it is sensible to provide solid state or hybrid control devices (contactors and remote-control switches) that reduce these impulse currents (activation on voltage passage through zero). Overvoltages The risk As illustrated in earlier sections, switching on a lighting circuit causes a transient state which is manifested by a significant overcurrent. This overcurrent is accompanied by a strong voltage fluctuation applied to the load terminals connected to the same circuit. These voltage fluctuations can be detrimental to correct operation of sensitive loads (micro-computers, temperature controllers, etc.) The Solution It is advisable to separate the power supply for these sensitive loads from the lighting circuit power supply. Sensitivity of lighting devices to line voltage disturbances Short interruptions b The risk Discharge lamps require a relighting time of a few minutes after their power supply has been switched off. b The solution Partial lighting with instantaneous relighting (incandescent lamps or fluorescent tubes, or “hot restrike” discharge lamps) should be provided if safety requirements so dictate. Its power supply circuit is, depending on current regulations, usually distinct from the main lighting circuit. Schneider Electric - Electrical installation guide 2008 N41 © Schneider Electric - all rights reserved
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General rules of electrical install
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Chapter A General rules of electrical installation design

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