Electric Charges Electric Current Electric Field Semiconductors Conduct Ors
Electric Charges Electric Current Electric Field Semiconductors Conduct Ors
Electric Charges Electric Current Electric Field Semiconductors Conduct Ors
History
Line voltage
Discs
(kV)
34.5
46
69
92
115
138
161
11
196
13
230
15
287
19
345
22
360
23
construction, so that an
Insulation of antennas
adequate
performance. Busbars and circuit
breakers in switchgear may be
insulated with glass-reinforced plastic
insulation, treated to have low flame
spread and to prevent tracking of
current across the material.
In older apparatus made up to the early
1970s, boards made of
compressed asbestos may be found;
while this is an adequate insulator at
power frequencies, handling or repairs
to asbestos material can release
dangerous fibers into the air and must
Notes[edit]