Installing electric motors and variable speed drives on construction and process sites involves heavy lifting, precise alignment, electrical connections, and work near rotating machinery. Incorrect installation can lead to motor failure, shaft misalignment, and dangerous unguarded rotating parts. This talk covers the hazards and safe working practices for motor and drive installation on site.
Key Hazards
Crushing injuries from handling heavy motor units during positioning
Entanglement with rotating shafts and couplings during test runs
Electric shock from incorrect wiring or failure to isolate before connection
Musculoskeletal injuries from manual handling of motors in confined plant rooms
Control Measures
Use mechanical lifting equipment to position motors — do not manually handle units over 25kg.
Isolate and lock out all power supplies before making any electrical connections to the motor.
Ensure motor shaft guards and coupling covers are fitted before any test rotation or commissioning.
Align the motor to the driven equipment using dial indicators or laser alignment tools as specified.
Verify rotation direction with a brief bump test before coupling the motor to the driven load.
Confirm cable sizes, termination torques, and earth bonding comply with the installation design.
Ensure the variable speed drive is programmed with the correct motor parameters before first run.
Brief all personnel in the area before any motor test run and maintain exclusion zones around rotating parts.
Record all installation data, alignment readings, and commissioning results in the project handover file.
Remember
Use mechanical lifting equipment for all motors over 25kg — never rely on manual handling alone
Isolate and lock out all power supplies before making any electrical connection to the motor
Shaft guards and coupling covers must be fitted before any test rotation or commissioning run
Verify rotation direction with a bump test before coupling the motor to the driven equipment
Brief all personnel in the area and maintain exclusion zones before any motor test run
Record installation data, alignment readings, and commissioning results in the handover file
Applicable Legislation: Electricity at Work Regulations 1989 · PUWER 1998 · LOLER 1998 · Health and Safety at Work etc. Act 1974