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9-l-4 IN THE SITUATION THAT POWER CONSUMPTION IS NOT SHOWN ON THE RATING PANEL:
Occasionally. the rating panel of an electric appliance does not carry its power consumption but only shows the mechanical
equivalent to the power consumption. In such a situation. it is necessary to calculate the power consumption of the device
involved. Depending on the types of load. the calculated power consumption is adjusted according to paragraphs 9-l-l
through 9-I-3 above.
(Power consumption) = (Mechanical equivalent of device) + (Efficiency)
Efficiency
Motors:
0.6 - 0.8
Fluorescent lamps: 0.7 - 0.8
Example :
A
4OW fluorescent
lamp with a lighting output of 40W and assuming that the power consumption of this lamp is
0.7, the power consumption is calculated as follows:
40 + 0.7 = 57W
Further, as per paragraph 9-l-2, the said power consumption is multiplied by a factor of 1.2 to 2. producing a
power consumption of 70 to 11 SW. Therefore. with this generator, four to seven 40W fluorescent lamps can be
used.
Example: In the case of a 2OOW motor. the mechanical equivalent of the motor is 200W. Assuming that the efficiency of
the motor is 0.7. the power consumption is calculated as 200 f 0.7 = 285W. Similar to the above, the calculated
power consumption is then multiplied as per paragraphs 3-1) or 3-2). taking into account the types of motor
and starting conditions. The table below shows the range of loads applicable to this generator.
Electric devices
Range of workable loads
50 Hz 60
Hz
I
Incandescent lamp, electric heater,
etc.
up to 4oow
up to 5oow
I
Fluorescent lamp, mercury lamp, etc. Up to approx. 300W Up to approx. 400W
I
Motor-driven tools etc.
I
Up to approx. 300W Up to approx. 350W
Pump and compressor drive motors
I Up to approx. 150W /
Up to approx. 200W
Table 9- 7
NOTE 7: With motor-driven tools and the motor-driven pumps and compressors specified in paragraphs 9-7-3
and 9-l-4, the generators of the said capacities are required only when starting the motors of the
respective appliance. Once the motor has started, the power which the generator is required to
supply to the motor decreases thereafter to a level approximately 1.2 to 2 times the rated power
consumption .
Therefore, the surplus capacity of the generator may be used for other electric appliances.
NOTE 2: As for the motor-driven devices specified in paragraph 9- 7-3 and 9-l -4, the power requirement for
starting varies according to the types of motor and the load conditions at time of starting.
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