每一套装置应包括一个主开关和电流表，电流表的刻度范围约20安培。
Each unit should include a main switch and ammeter with a scale of about 20 ampere capacity.
电流表A1应选用量程为毫安级电流表或选用数字电流表； 电流表A2应选用量程为50 A以下的安培级电流表或选用数字电流表。
For ammeter A1, milliamperemeter or digital ammeter shall be used while for ammeter A2 amperemeter upto 50 A or digital ammeter shall be used.
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