UL 6420 BULLETIN-2008《用于系统绝缘和作为单一装置的设备》

1.1.1.1 This standard applies to isolating equipment incorporating electromechanical contactors remotely
controlled and monitored to provide remote isolation status indication with a defined integrity level. This
equipment is intended for use as an additional isolating means on the load side of the required
supply-disconnecting device and over current protection. This standard applies to isolating equipment that
is to be used in circuits of which the rated voltage does not exceed 1000 volts ac or 1500 volts dc.
1.1.1.2 The System Isolation Equipment is expected to be used both as a means for removal of power
for prevention of unexpected start-up of a stopped machine and as an isolator to provide protection from
electric shock by ensuring the removal of electrical energy.
1.1.1.3 This equipment is intended for installation in accordance with the National Electrical Code, NFPA
70 and the Electrical Standard for Industrial Machinery, NFPA 79.
NOTE – Reference to System Isolation Equipment