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Technical Library

Patrick J. Welch "Recommended Grounding Practices for Modern Elevator Drives" Elevator World, April 2001
234 KB PDF file

Patrick J. Welch "APTA Heavy Duty Escalator Guidelines" APTA Rail Conference, June 2001
54 KB PDF file

Patrick J. Welch "Remote Monitoring of Elevators and Escalators: Managing the Alarms and the Maintenance" APTA Rail Conference, June 2001
58 KB PDF file

Patrick J. Welch "Escalator Modernization Versus Escalator Replacement" Elevator World, August 2000
195 KB PDF file

Patrick J. Welch "Elevator Guidelines for Emergency Generators" Elevator World, March 1998
106 KB PDF file