Other lamp technologies - choice of circuit breaker
From Electrical Installation Guide
For LED lamps, see LED lamps - choice of circuit breaker.
Fig. N72 below indicates the maximum number of lamps according to the circuit breaker rating, for C-curve circuit breakers
- for B-curve circuit breakers, the number of lamps should be reduced by 50%,
- for D-curve circuit breakers, the number of lamps should be increased by 50%.
Fig. N72 – Maximum number of lamps according to the circuit breaker rating and curve, for other technologies than LED
Products | Circuit breaker (C curve) | ||||||
---|---|---|---|---|---|---|---|
Type of lamp | 10 A | 16 A | 25 A | 40 A | 63 A | ||
Standard incandescent lamps, LV halogen lamps, replacement mercury vapor lamps (without ballast) | |||||||
40 W | 28 | 46 | 70 | 140 | 207 | ||
60 W | 23 | 36 | 55 | 103 | 152 | ||
75 W | 29 | 31 | 46 | 80 | 121 | ||
100 W | 15 | 23 | 33 | 60 | 88 | ||
ELV 12 or 24 V halogen lamps | |||||||
Ferromagnetic transformer | 20 W | 11 | 19 | 27 | 50 | 75 | |
50 W | 8 | 12 | 19 | 33 | 51 | ||
75 W | 7 | 10 | 14 | 27 | 43 | ||
100 W | 5 | 8 | 10 | 22 | 33 | ||
Electronic transformer | 20 W | 47 | 74 | 108 | 220 | 333 | |
50 W | 19 | 31 | 47 | 92 | 137 | ||
75 W | 15 | 24 | 34 | 64 | 94 | ||
100 W | 12 | 20 | 26 | 51 | 73 | ||
Fluorescent tubes with starter and ferromagnetic ballast | |||||||
1 tube without compensation^{[a]} | 15 W | 16 | 26 | 37 | 85 | 121 | |
18 W | 16 | 26 | 37 | 85 | 121 | ||
20 W | 16 | 26 | 37 | 85 | 121 | ||
36 W | 15 | 24 | 34 | 72 | 108 | ||
40 W | 15 | 24 | 34 | 72 | 108 | ||
58 W | 9 | 15 | 21 | 43 | 68 | ||
65 W | 9 | 15 | 21 | 43 | 68 | ||
80 W | 8 | 12 | 19 | 36 | 58 | ||
115 W | 6 | 9 | 12 | 24 | 38 | ||
1 tube with parallel compensation^{[b]} | 15 W | 5 µF | 11 | 19 | 24 | 48 | 72 |
18 W | 5 µF | 11 | 19 | 24 | 48 | 72 | |
20 W | 5 µF | 11 | 19 | 24 | 48 | 72 | |
36 W | 5 µF | 11 | 19 | 24 | 48 | 72 | |
40 W | 5 µF | 11 | 19 | 24 | 48 | 72 | |
58 W | 7 µF | 8 | 12 | 19 | 36 | 51 | |
65 W | 7 µF | 8 | 12 | 19 | 36 | 51 | |
80 W | 7 µF | 8 | 12 | 19 | 36 | 51 | |
115 W | 16 µF | 4 | 7 | 9 | 17 | 24 | |
2 or 4 tubes with series compensation | 2 x 18 W | 23 | 36 | 56 | 96 | 148 | |
4 x 18 W | 12 | 20 | 29 | 52 | 82 | ||
2 x 36 W | 12 | 20 | 29 | 52 | 82 | ||
2 x 58 W | 8 | 12 | 20 | 33 | 51 | ||
2 x 65 W | 8 | 12 | 20 | 33 | 51 | ||
2 x 80 W | 7 | 11 | 15 | 26 | 41 | ||
2 x 115 W | 5 | 8 | 12 | 20 | 31 | ||
Fluorescent tubes with electronic ballast | |||||||
1 or 2 tubes | 18 W | 56 | 90 | 134 | 268 | 402 | |
36 W | 28 | 46 | 70 | 142 | 213 | ||
58 W | 19 | 31 | 45 | 90 | 134 | ||
2 x 18 W | 27 | 44 | 67 | 134 | 201 | ||
2 x 36 W | 16 | 24 | 37 | 72 | 108 | ||
2 x 58 W | 9 | 15 | 23 | 46 | 70 | ||
Compact fluorescent lamps | |||||||
External electronic ballast | 5 W | 158 | 251 | 399 | 810 | Infrequent use | |
7 W | 113 | 181 | 268 | 578 | |||
9 W | 92 | 147 | 234 | 463 | |||
11 W | 79 | 125 | 196 | 396 | |||
18 W | 49 | 80 | 127 | 261 | |||
26 W | 37 | 60 | 92 | 181 | |||
Integral electronic ballast (replacing incandescent lamps) | 5 W | 121 | 193 | 278 | 568 | 859 | |
7 W | 85 | 137 | 198 | 405 | 621 | ||
9 W | 71 | 113 | 160 | 322 | 497 | ||
11 W | 59 | 94 | 132 | 268 | 411 | ||
18 W | 36 | 58 | 83 | 167 | 257 | ||
26 W | 25 | 40 | 60 | 121 | 182 | ||
Low-pressure sodium vapor lamps with ferromagnetic ballast and external ignitor | |||||||
Without compensation^{[a]} | 35 W | 4 | 7 | 11 | 17 | 29 | |
55 W | 4 | 7 | 11 | 17 | 29 | ||
90 W | 3 | 4 | 8 | 11 | 23 | ||
135 W | 2 | 3 | 5 | 8 | 12 | ||
180 W | 1 | 2 | 4 | 7 | 10 | ||
With parallel compensation^{[b]} | 35 W | 20 µF | 3 | 4 | 7 | 12 | 19 |
55 W | 20 µF | 3 | 4 | 7 | 12 | 19 | |
90 W | 26 µF | 2 | 3 | 5 | 8 | 13 | |
135 W | 40 µF | 1 | 2 | 3 | 5 | 9 | |
180 W | 45 µF | 0 | 1 | 2 | 4 | 8 | |
High-pressure sodium vapor lamps
Metal-iodide lamps | |||||||
Ferromagnetic ballast with external ignitor, without compensation^{[a]} | 35 W | 12 | 19 | 28 | 50 | 77 | |
70 W | 7 | 11 | 15 | 24 | 38 | ||
150 W | 3 | 5 | 9 | 15 | 22 | ||
250 W | 2 | 3 | 5 | 10 | 13 | ||
400 W | 0 | 1 | 3 | 6 | 10 | ||
1000 W | 0 | 0 | 1 | 2 | 3 | ||
Ferromagnetic ballast and external ignitor, with parallel compensation^{[b]} | 35 W | 6 µF | 14 | 17 | 26 | 43 | 70 |
70 W | 12 µF | 8 | 9 | 13 | 23 | 35 | |
150 W | 20 µF | 5 | 6 | 9 | 14 | 21 | |
250 W | 32 µF | 3 | 4 | 5 | 10 | 14 | |
400 W | 45 µF | 2 | 3 | 4 | 7 | 9 | |
1000 W | 60 µF | 0 | 1 | 2 | 4 | 7 | |
2000 W | 85 µF | 0 | 0 | 1 | 2 | 3 | |
Electronic ballast | 35 W | 15 | 24 | 38 | 82 | 123 | |
70 W | 11 | 18 | 29 | 61 | 92 | ||
150 W | 6 | 9 | 14 | 31 | 48 |
- High-pressure sodium vapor lamps: for the 10 A and 16 A B-curve ratings, the number of lamps should be reduced by 10% to limit unwanted magnetic tripping.
- ^ ^{1} ^{2} ^{3} Circuits with non-compensated ferromagnetic ballasts consume twice as much current for a given power output. This explains the small number of lamps in this configuration.
- ^ ^{1} ^{2} ^{3} The total capacitance of the power factor capacitors in parallel on a circuit limits the number of lamps that can be controlled by a contactor. The total downstream capacitance of a modular contactor of rating 16, 25, 40 or 63 A should not exceed 75, 100, 200 or 300 μF respectively. Allow for these limits to calculate the maximum acceptable number of lamps if the capacitance values are different from those in the table.