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536
ANNEXES
נספחים
טבלת בדיקות מתח
Dielectric test voltage a.c. r.m.s.
Rated insulation voltage Ui
(line to line )
V
V
250
Ui
≤ 12
500
12 ˂
Ui
≤ 300
See
Table
8
60 ˂
Ui
חישוב זרם שיא לפי זרם קצר
Table 7 - Values for the factor nª (9.3.3)
n
cos ɸ
r.m.s. value of short-
circuit current kA
1.5
0.7
I
≤ 5
1.7
0.5
5 ˂
I
≤ 10
2
0.3
10 ˂
I
≤ 20
2.1
0.25
20 ˂
I
≤ 50
2.2
0.2
50 ˂
I
a - Values of this table represent the majority of applications in
special locations . For example in the vicinity of transformers or
generators , lower values of power factor may be found , whereby
the maximum prospective peak current may become the limiting
value instead of the r.m.s. value of the short-circuit current .
טבלת בדיקות מתח
Table 8 - Power-frequency withstand voltage for main circuits ( 10.9.2 )
Dielectric test voltage
ᵇ d.c
Dielectric test voltage
a.c. r.m.s.
Rated insulation voltage
Ui (line to line
a.c.ord.c )
V
V
V
1415
1000
Ui
≤ 60
2120
1500
60 ˂
Ui
≤ 300
2670
1890
300 ˂
Ui
≤ 690
2830
2000
690 ˂
Ui
≤ 800
3110
2200
800 ˂
Ui
≤ 1000
3820
1000 ˂
Ui
≤ 1500
ª
a - For d.c. only .
b - Test voltages based on 6.1.3.4.1. fifth paragraph, of IEC 60664-1
מקדם העמסה
Table 101 - Values of assumed loading
Assumed loading factor
Type of load
0.9
Distribution
- 2
and
3
circuits
0.8
Distribution
- 4
and
5
circuits
0.7
Distribution
- 6
to
9
circuits
0.6
Distribution
- 10
or more
circuits
0.2
Electric
actuator
0.8
Motors
≤ 100
kw
1
Motors
˃ 100
kw