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5.
Lhppliances without any indication as to power consumption
Some appliances have no indication as to power consumption: but instead the work load (outpurj is indicated. In such a
case. power consumption is to be worked out according to the numerical formula indicated below.
(Output of slectrical appliance)
(Efficiency,l
= (Power consumption)
Efficiencies of some electrical appliances are as follows:
Single-phase motor _ . . _ . . 0.6 - 0.75 -
- The smaller the capacity. the wors2 the efficiency.
Three-phase motor . _ . . _ . . . . . 0.65 - 0.9 ~
and dce versa.
Fluorescent lamp . . . . . . . _ . . 0.7 - 0.8
Example 1: X 4ON fluorescsnt lamp means that its luminous output is 4OK. Its efficiency is 0.7 and accordin&. pow-
er consumption will be 40 - 0.7 = 5XV. As explained in Item 2.
multiply this pow2r consumption value
of 57lV b>- 1.’ - 2
and you will get th2 figure of necessar>- capacity of a generator. In other Lvords. a gen-
erator with a rated output of lOOON- capacity- can li@t nine to fourteen 4017 tluorescent lamps.
Example 2: GeneraIl!- speakin,.
0 a -lOON- motor means that its work load is -lOON-. Efficiency oi this motor is 0.7 and
power consumption Lvill be 100 +- 0.7 = 57OK. W12n this motor 1s us2d ior a motor-driven tool. the capa-
city of the generator should be multipled b>- 1 .Z to 3 and
5701V as explained in Item 3. Moreover. when
this motor is used for the submerged pump or air compr2sser. it requir2s 3
- 5
times
as powveriul a genera-
tor as in Item 4.
I
Model
I
RGX180
I
RGX240
RGX240D
Frequency
Incandescent lamp,
hot plate, etc.
50Hz ’
60Hz
50Hz ! 60Hz
1300w
15oow
i 1700~ 1 2000~
Fluorescent lamp,
about
about
about about
mercury lamp, etc.
j 850W
1ooow 11oow
13oow
Motor-driven tool,
general-purpose
motor, etc.
about ’
about
750w
850W
about
1 ooow
about
12oow
Water pump,
compressor
I
about
about ’
about about
350w
4oow
5oow ’ 600W
Table 7- 1
- 28 -