If a switch is operated at the rate of 10 cycles per minute, at least 10 banks of lamps controlled by a commutator shall be used for each switch under test.

 
  • 如果开关以1分钟10周期的速度操作,至少有10组灯被1个转向器控制,该转向器在测试中被用作每组灯的开关。
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