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(5) Appliances without any indication & t& -&&ver consumption
Some appliances have no indication as to power consumption; but instead the work load (output) is
indicated. In such a case, power consumption is to be worked out according to the numerical formula
mentioned below.
(Output of electrical appliance) = tPower consumption~
(Efficiency)
Efficiencies of
some
electrical appliances are as follows:
Single-phase motor * - * * . * * - - - * * . . * - * 0.6 - 0.75 The smaller the motor, the
Three-phase motor * * - . * - - * * - - - - - - - 0.65 - 0.9
II-
lower the efficiency.
Fluorescent lamp * . - . . * * * * - . * * . * * . * - 0.7 - 0.8
Example
1: A 40W fluorescent lamp means that its luminous output is 40W. Its efficiency is 0.7 and
accordingly, power consumption will be 40
+ 0.7= 57W. As explained in
item(2),
multiply
this power consumption value of 57W by 1.2 - 2 and you will get the figure of the necessary
capacity of a generator. In other words, a generator with a rated output of 1OOOWcapacity
can light nine to fourteen 40W fluorescent lamps.
Example
2: Generally speaking, a 400W motor means that its work load is 400W. Efficiency of this
motor is 0.7 and power consumption will be 400 f 0.7= 57OW. When this motor is used for
a motor-driven tool, the capacity of the generator should be multipled by 1.2 to 3 and 570W
as explained in the
Item(3).
MODEL RGX1800
Frequency 50Hz
60Hz
lncandesent lamp,
heater, etc.
Fluorescent lamp,
mercury lamp, etc.
I I
approx.
approx.
9oow
1 OOOW
Motor-driven tool,
general-purpose motor,
I I
approx. approx.
etc.
800W 9oow
Water pump,
compressor, etc.
approx.
I I
approx.
4oow 450w
approx.
1lOOW
approx.
1 ooow
approx.
5oow
approx.
13oow
approx.
12oow
approx.
600W
approx.
17oow
approx.
15Oow
approx.
750w
approx.
2ooow
approx.
18OOW
approx.
9oow.
4400w
4800W
approx.
2800w
approx.
3200W
approx.
2600W
approx.
2900w
approx.
13oow
approx.
14oow
Tab/e 7-1
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