Installation and Maintenance
Installation and Maintenance
This domain tests planned installation, mechanical integrity, correct terminations, clearances, preventive maintenance, and equipment condition assessment. The focus is on work that remains safe and reliable after commissioning.
Core rules
- Follow manufacturer instructions for torque, cable support, bending, clearance, and environmental ratings.
- Terminations must use correct lugs, washers, and torque; tighten with a calibrated tool and mark completed joints where procedures require it.
- Maintain disconnects, guards, labels, and access clearances after installation.
- Preventive maintenance includes thermal inspection, cleaning, verification of connections, insulation checks, and replacement of degraded parts.
Worked example
A lug label specifies 25 lb-in. Use the correct driver bit and a calibrated torque screwdriver, hold the tool square to the fastener, and mark the joint. Overtorque can stretch the stud or crack a lug; undertorque raises contact resistance. A loose joint heats under load, oxidizes, and can fail thermally even if the circuit initially works. If the label is missing, use the manufacturer’s data or the adopted code rather than guessing.
Traps
Tightening “by feel”; mixing plated and unplated hardware; reusing damaged lugs; ignoring thermal imaging hot spots; leaving temporary supports; failing to verify dead before maintenance.