IEC-129-Alternating Current Disconnector and Earthing Switches

129 © IEC 1984

−33−

The values given in Table VB show (for information) the present practice in the United States •of America and Canada. TABLE VB (under consideration) Co-ordination of rated values for rated voltages Series II: 4.76 KV to 38.0KV (Indoor disconnectors)

Rated voltage

Rated short– time withstand current (r.m.s.

Rated peak withstand

Rated normal current (r.m.s)

(KV)

(KA)*

(KA)

(A)

4.76

12.5 25 38.1 50 62.5

33.8 67.5 102.9 135 168.8

200 -

400 -

630 -

1250 -

2000 -

3150

-

-

-

8.25

12.5 25 38.1 50 62.5 75 100 125

33.8 67.5 102.9 135 168.8 202.5 270 337.6

200 -

400 -

630 -

1250 -

2000 -

3150 -

4000 -

5000

6300

15 and 15.5

12.5 25 38.1 50 62.5 75 100 125

33.8 67.5 102.9 135 168.8 202.5 270 337.6

200 -

400 -

630 -

1250 -

2000 -

3150 -

4000 -

5000

6300

25.8

12.5 25 38.1 50 62.5 75 100

33.8 67.5 102.9 135 168.8 202.5 270

-

400 -

630 -

1250 -

2000 -

3150 -

4000 -

5000

-

38

12.5 25 38.1 50 62.5 75

33.8 67.5 102.9 135 168.8 202.5

-

400 -

630 -

1250 -

2000 -

3150 -

4000

-

-

Values more in the with IEC Publication are under consideration

Note: - The co-ordination table is intended to be used as a guide for preferred values and is not mandatory. Therefore a disconnector or earthing switch with another combination of the rate values is not outside this specification