The circuit on which the ballast is tested is to be protected by Class H non-renewable fuses at ten times the input current rating of the ballast or the next higher ampere fuse rating but in no case less than20 amperes.

• 被测试的镇流器的电路由H级的不可再生的保险丝(镇流器的额定电压的十倍)护着的或者是更高安培的熔丝额定值；但是决不能少于20安培.