New regulations

Constant loading is very important as frequent and regular switching of large power loads can cause power supply flicker. Indeed, CENELEC, the European Committee for Electro-technical Standardization, has published rules which limit the rate at which domestic heating apparatus may be switched on and off. This table (from CENELEC publication EN50.006) gives the minimum repetition period for a range of load powers and common power supply voltages:

Appliance

Repetition period, in seconds

Power (W)

220V

240V

380V

600

0.2

0.2

-

800

0.8

0.3

0.1

1000

2.0

1.0

0.2

1200

4.6

2.0

0.2

1400

7.0

4.3

0.2

1600

10.0

6.3

0.3

1800

16.0

8.9

0.5

2000

24.0

13.0

0.9

2200

32.0

17.0

1.3

2400

40.0

24.0

1.9

2600

-

31.0

2.6

2800

-

-

CENELEC Regulations

By using a "dummy" load, we ensure that a constant loading is presented to the main power supply and the circuit complies with these rules. For American readers, do not imagine that these rules will not apply to you simply because the voltages from this European standard do not include 115/120V. You may deduce from the figures that the harmful effects of repetitive loading will be felt even more in low voltage power supplies, and if similar regulations have not yet been enacted in the USA, you may be assured that they are on their way!

CENELEC Regulations

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