Motor List
Template (Excel)

A motor list (also called a motor schedule or motor register) is the master register of every electric motor on a project: pump motors, fan and blower motors, compressor motors, agitator motors, conveyor motors. For each motor it records tag, driven equipment, service, rated power (kW), voltage and frequency, frame size per IEC or NEMA, speed and pole count, insulation class per IEC 60034, duty cycle, IP rating per IEC 60529, cooling method, starting method (DOL, star-delta, soft start, VFD), hazardous area protection per IEC 60079, vendor, and datasheet reference.

Required columns: motor tag and driven equipment tag, service description, P&ID and SLD reference, rated power in kW or HP, voltage and frequency, number of phases, frame size (IEC frame designation 56 to 400, or NEMA frame designation 48 to 449T), speed and pole count, insulation class (F most common, H for high temperature), temperature rise class (B or F), duty cycle per IEC 60034-1, enclosure and IP rating, cooling method per IEC 60034-6, starting method, hazardous area protection per IEC 60079, vendor and datasheet reference. Indian PSU scope additionally references IS 12615 for energy-efficient motors.

Pathnovo, an engineering document intelligence platform, extracts every motor-driven equipment item from the P&IDs and cross-references the equipment datasheets for power and speed, the single line diagram for electrical supply, and the area classification drawing for hazardous area requirements. The platform assembles the motor list with tag, power, voltage, frame, IP rating, starting method, and hazardous area protection populated. Output is configurable to your EPC motor list format. See the P&ID extraction workflow.

The motor list, SLD, and electrical load list are linked on the motor tag and the supply feeder reference. The motor list is the inventory side: it captures motor-side data (power, voltage, frame, IP). The SLD captures the supply side: switchgear, MCC bus, starter type, protection. The load list aggregates motor demand and non-motor demand into total feeder load. The three documents are populated in this order: motor list first from the P&IDs and equipment datasheets, SLD next driven by motor demand, then load list aggregated from both. See the electrical load list template.

IEC and NEMA define different motor frame standards. IEC 60072 defines frame sizes 56 to 400 (typical refinery range 80 to 315), with shaft height in millimetres matching the frame number (frame 280 has 280 mm shaft height). NEMA MG-1 defines frame sizes 48 to 449T, with shaft height in sixteenths of an inch derived from the first two digits. EPC projects in India, Europe, GCC, and Southeast Asia default to IEC. EPC projects on US scope default to NEMA. The motor list Frame Size column must capture the framing standard explicitly to avoid procurement errors.

Hazardous area motors are specified per IEC 60079 protection methods: Ex d (flameproof, the enclosure contains an internal explosion), Ex e (increased safety, no arcs or sparks in normal operation), Ex n (non-sparking, Zone 2 only), or Ex p (purged or pressurised). Zone 1 typically takes Ex d or Ex e. Zone 2 typically takes Ex n. Zone 0 motors are rare (typically eliminated by design). The motor Temperature Class (T1 to T6) must be lower than the auto-ignition temperature of the surrounding fluid. The motor list Hazardous Area Classification column drives the protection method, T-class, and Equipment Protection Level (EPL).

Add a Scope column flagging each motor row as 'existing', 'modified', 'new-installed', or 'demolish'. Existing motors are preserved for context (the new pump motor connects to the existing MCC bus). Procurement scope fires only from 'modified' (re-rated or replaced motors) and 'new-installed' rows. For revamps where existing motor demand increases due to higher throughput, the SLD and load list must be re-verified to confirm MCC bus and transformer capacity. Particularly important on Indian PSU and GCC refinery debottlenecking projects.