(5)
Appliances without any indication as to power 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)
(Efficiency)
=
(Power consumption)
Example
1
:
Example
2:
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
lower the efficiency.
Fluorescent lamp
.
. . . .
.
.
. .
.
.
.
. . . .
. .
.
0.7
-
0.8
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
1000Wcapacity
can light nine to fourteen 40W fluorescent lamps.
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
+
0.7= 570W. When this motor
is
used for
a motor-driven tool: the capacity of the generator should be multiple of 570W by 1.2 to
3
as
explained
in
the
Itern(3).
570(W)
X
1.2-3=684(W)-1710(W)
MODEL
1
I
RGV2200
Frequency 50Hz
i
60Hz
i
lncandesent lamp,
heater, etc.
1
14OOW
I
1800W
Fluorescent lamp,
mercury lamp, etc.
Electric tool etc.
approx.
I
approx.
1
700W
1
9OOW
approx.
I
approx.
400W
'
400W
RGV2600 RGV4000 RGV6000
I
I
I
I
-
I
50Hz 60HZ
1
50Hz
!
60Hz
1
50Hz
'
i
60Hz
I
I
2000w
2200w
3000W
j
3500W
1
4400W
I
4800W
I
i
I
I I I
I
I
approx. approx.
I
approx.
I
approx.
I
approx.
approx.
lOOOW
j
1100W
1
1500W
1
1800W
\
2000W
I
2350W
!
I
i
approx.
1
approx.
1600W
!
16OOW 18OOW
I
2000W
800W
i
800W
approx.
1
approx.
1
approx.
j
approx.
approx.
I
approx. approx. approx. approx. approx. approx. app:ox.
Pump. compressor, etc.
I
300W
i
400W
I
400W
I
400W
:
750W
I
750W 800W
1
800W
i
Table
7-1
-
30
-
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