Elevator Forum chitownvator @chitownvator Forum Home | Recent Posts Active Member Joined: Jan 1, 2010 Follow Profile Activity Topics: 2 / Replies: 1 AllTopicsReplies Topic Dover composite PI Board 8 years ago Forum Technical Questions Replies: 0 Views: 1067 Reply they uses an ungrounded system like westinghouse did. they want to isolate the 24v circuits from earth ground because of possible induced voltage into... 11 years ago Forum Technical Questions Topic Otis 311 Fault 11 years ago Forum Technical Questions Replies: 1 Views: 3123
