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Retain all documentation for future reference. 3 Follow all instructions printed on unit chassis for proper operation. 4 Do not use the unit if the electrical power cord is frayed or broken. The power supply cord should be routed so that it is not likely to be walked on or pinched by items placed upon or against it. 5 Always operate the unit with the AC ground wire connected to the electrical system ground. Precautions should be taken so that the means of grounding of a piece of equipment is