+---
+title: Common Motor Requirements for Electrical Equipment
+category: Electrical
+toc_depth: 3
+description: >
+ When to use: Common requirements for low-voltage three-phase squirrel-cage
+ AC induction motors, 1/4 HP through 500 HP at 200-600 V, 60 Hz, furnished as
+ part of mechanical, plumbing, HVAC, process, and electrical equipment and
+ driven across the line, through combination or soft starters, or by a VFD.
+ Written as a referenced-by standard that equipment specifications call rather
+ than restating motor criteria.
+ Not intended for: starting and control devices (sync/combination-motor-starters);
+ motor control center assemblies (sync/motor-control-centers); VFD electronics,
+ filtering, and acceptance testing (sync/low-voltage-variable-frequency-drives,
+ sync/hvac-variable-frequency-drives); medium-voltage motors above 600 V;
+ motors certified integral to listed packaged equipment by that equipment's
+ specification; branch-circuit conductors (sync/conductors-and-cables); and
+ upstream distribution (sync/low-voltage-panelboards, sync/low-voltage-switchboards).
+---
+
+# Scope {toc}
+
+## This standard establishes common requirements for low-voltage, three-phase, squirrel-cage AC induction motors furnished as an integral part of driven equipment supplied under any division of the Work. {note}
+
+## It applies to motors rated 1/4 HP through 500 HP, 200 V through 600 V, 60 Hz, regardless of whether the motor is started across the line or through a combination starter, soft starter, or variable frequency drive. {note}
+
+## Equipment specifications for pumps, fans, compressors, conveyors, and similar driven machinery shall cite this standard for motor requirements rather than restating motor criteria.
+
+## Where an equipment specification states a motor requirement that conflicts with this standard, the more stringent requirement shall govern unless the Engineer of Record directs otherwise in writing.
+
+## Motors shall comply with this standard, with [[sync/grounding-and-bonding]] for equipment grounding, and with the applicable starter, drive, or control standard for the selected starting method.
+
+## The following are outside the scope of this standard and are governed elsewhere. {note}
+- Starting and control devices (contactors, overload relays, manual motor protectors) - see [[sync/combination-motor-starters]].
+- Motor control center assemblies, bus, and plug-in units - see [[sync/motor-control-centers]].
+- Variable frequency drive electronics, harmonic mitigation, bypass, and drive acceptance testing - see [[sync/low-voltage-variable-frequency-drives]] and [[sync/hvac-variable-frequency-drives]].
+- Medium-voltage motors rated above 600 V, which fall outside the low-voltage applicability of NEMA MG 1 Part 12.
+- Motors certified by the equipment manufacturer as part of a factory-tested listed package (chillers, rooftop units, packaged pumps), which are governed by the respective equipment specification.
+- Branch-circuit conductors and cables from the motor terminals to the controller - see [[sync/conductors-and-cables]].
+- Power distribution upstream of the motor branch circuit - see [[sync/low-voltage-panelboards]] and [[sync/low-voltage-switchboards]].
+
+# Referenced Standards {toc}
+
+## Motors shall comply with the latest adopted edition of each of the following unless a specific edition is cited or a more recent edition is mandated by the authority having jurisdiction.
+
+## Where referenced standards conflict, the more stringent requirement shall govern unless the Engineer of Record directs otherwise in writing.
+
+| Standard | Title |
+|----------|-------|
+| ANSI/NEMA MG 1 | Motors and Generators |
+| NFPA 70 (NEC) Article 430 | Motors, Motor Circuits, and Controllers |
+| NFPA 70 (NEC) Article 430 Part VII | Motor Controllers |
+| UL 1004-1 | Rotating Electrical Machines - General Requirements |
+| ASHRAE 90.1 | Energy Standard for Buildings Except Low-Rise Residential Buildings (Section 10.4) |
+| 10 CFR Part 431 | Energy Conservation Standards for Electric Motors (EISA 2007; DOE 2027 rule) |
+| IEEE 112 | Standard Test Procedure for Polyphase Induction Motors and Generators |
+| IEEE 43 | Recommended Practice for Testing Insulation Resistance of Electric Machinery |
+| IEEE 841 | Severe-Duty TEFC Squirrel-Cage Induction Motors (Petroleum and Chemical Industry) |
+| NEMA ICS 2 | Controllers, Contactors and Overload Relays Rated Not More Than 2000 V AC or 750 V DC |
+| NFPA 70E | Standard for Electrical Safety in the Workplace |
+
+## ANSI/NEMA MG 1 is the primary technical authority for this standard; it governs efficiency classes, frame dimensions, nameplate data, temperature rise, insulation class, service factor, starting current, and altitude and ambient derating. {note}
+
+## The current revision is published as ANSI/NEMA MG 00001 using a zero-padded document number; references to "MG 1" in this standard and in submittals mean the same document. {note}
+
+# Submittals {toc}
+
+## The Contractor shall submit the following product data for each motor or motor type furnished under the Work, identified by the driven equipment it serves:
+- Manufacturer's catalog data sheet showing HP, voltage, phase, frequency, full-load amperes, locked-rotor amperes or code letter, NEMA design letter, and frame size.
+- Efficiency class designation (NEMA Premium / IE3 or NEMA Premium 4 / IE4) with nominal full-load efficiency at the rated load point.
+- Enclosure type, insulation class, temperature rise, and service factor.
+- Inverter-duty rating and conformance statement to NEMA MG 1 Part 31 for every VFD-driven motor.
+- Nameplate facsimile showing all data required by NEMA MG 1 Section 10.40.
+- Certified IEEE 112 Method B efficiency test report establishing compliance with the specified efficiency class.
+
+```datasheet
+label: Action submittals
+type: checkbox
+options:
+ - Catalog data sheet (HP, voltage, FLA, LRA, design letter, frame)
+ - Efficiency class and nominal full-load efficiency
+ - Enclosure, insulation class, temperature rise, service factor
+ - Inverter-duty conformance to NEMA MG 1 Part 31 (VFD motors)
+ - Nameplate facsimile
+ - IEEE 112 Method B certified efficiency test report
+```
+
+## The Contractor shall submit the following informational submittals for review:
+- Manufacturer's installation, alignment, and lubrication instructions.
+- Bearing data including bearing type, lubrication method, and recommended regreasing interval.
+- Statement of altitude and ambient rating, with derating calculations where the installed elevation exceeds 3,300 ft (1,000 m) or the ambient exceeds 40 °C.
+
+```datasheet
+label: Informational submittals
+type: checkbox
+options:
+ - Installation, alignment, and lubrication instructions
+ - Bearing type, lubrication method, and regreasing interval
+ - Altitude and ambient rating with derating calculations
+```
+
+## The Contractor shall submit the following closeout submittals before Substantial Completion:
+- Field acceptance test records including insulation resistance, rotation check, and no-load running current balance.
+- Manufacturer's warranty certificate.
+- Final lubrication record identifying lubricant type and quantity for each motor with external grease fittings.
+
+```datasheet
+label: Closeout submittals
+type: checkbox
+options:
+ - Field acceptance test records
+ - Warranty certificate
+ - Final lubrication record
+```
+
+# Quality Assurance {toc}
+
+## Each motor shall be listed and labeled by a Nationally Recognized Testing Laboratory under UL 1004-1.
+
+## Each general-purpose motor 1 HP through 500 HP shall meet or exceed the minimum nominal full-load efficiency required by 10 CFR Part 431 and ASHRAE 90.1 for its horsepower, pole count, and enclosure.
+
+## The manufacturer shall have produced motors of the specified type and rating for not less than five years.
+
+## Motor efficiency shall be established by test in accordance with IEEE 112 Method B, and the certified test report shall accompany the product submittal.
+
+## The current federal minimum efficiency for general-purpose motors 1-200 HP is NEMA Premium (IE3) under EISA 2007 (10 CFR 431); the DOE 2027 final rule expands fractional-HP coverage and extends IE4 requirements to large machines, with staged compliance dates in June 2027 and January 2029. {note}
+
+## Specifying NEMA Premium (IE3) as the default satisfies current federal law and ASHRAE 90.1; the owner's sustainability standard may require NEMA Premium 4 (IE4) where lifecycle energy cost justifies the premium. {note}
+
+# Environmental and Service Conditions {toc}
+
+## Motors shall be rated for continuous duty at the service conditions of the installed location without exceeding the temperature rise corresponding to the specified insulation class.
+
+## Standard-rated motors are suitable for an ambient not exceeding 40 °C and an installed elevation not exceeding 3,300 ft (1,000 m); these are the conditions assumed by NEMA MG 1 for standard catalog ratings. {note}
+
+## Motors installed where the ambient exceeds 40 °C shall be furnished with Class H insulation or a special winding rated for the actual ambient.
+
+## Motors installed above 3,300 ft (1,000 m) shall be derated, or furnished with a special winding, such that the temperature rise at the installed elevation does not exceed the limit for the insulation class.
+
+## Altitude derating is commonly missed because manufacturers quote standard catalog data; for mountain-region projects above 3,300 ft the temperature-rise margin shrinks roughly 3% per 500 m of elevation and must be verified in the submittal. {note}
+
+## The applied voltage shall not vary more than ±10% of nameplate voltage, and the applied frequency shall not vary more than ±5% of nameplate frequency; the combined voltage and frequency variation shall not exceed 10% per NEMA MG 1 Section 12.44.
+
+```datasheet
+label: Maximum ambient temperature
+type: range
+unit: °C
+min: 40
+max: 65
+step: 5
+```
+
+```datasheet
+label: Installed elevation above sea level
+type: range
+unit: ft
+min: 0
+max: 10000
+step: 500
+```
+
+# Electrical Ratings {toc}
+
+## Motors shall be three-phase, 60 Hz, squirrel-cage induction type rated for the nominal system voltage serving the branch circuit.
+
+## The nameplate voltage shall be the NEMA-standard utilization voltage for the system: 460 V for a 480 V system, 208 V for a 208 V system, and 575 V for a 600 V system.
+
+## 460 V / 3Φ / 60 Hz is the workhorse rating for commercial and industrial motors; small equipment is commonly 208 V, and dual-voltage 230/460 V windings are offered for 1-50 HP where field voltage flexibility is wanted. {note}
+
+## Dual-voltage motors shall be shipped connected for the system voltage indicated, with the alternate connection diagram on the nameplate or inside the conduit box.
+
+```datasheet
+label: Rated voltage
+type: select
+options:
+ - 208 V / 3Φ / 60 Hz
+ - 230 V / 3Φ / 60 Hz
+ - 460 V / 3Φ / 60 Hz
+ - 575 V / 3Φ / 60 Hz
+ - Dual-voltage 230/460 V / 3Φ / 60 Hz
+default: 460 V / 3Φ / 60 Hz
+```
+
+```datasheet
+label: Horsepower rating
+type: range
+unit: HP
+min: 0.25
+max: 500
+step: 0.25
+drawing_ref: "motor and equipment schedule"
+default: deferred
+```
+
+## NEMA Design B is the standard low-slip squirrel-cage design suited to most pumps and fans; Design C provides higher starting torque for conveyors and positive-displacement loads, and Design D serves high-inertia loads. {note}
+
+## The motor design letter shall be coordinated with the driven load so that the available starting torque exceeds the load torque throughout acceleration.
+
+## Specifying NEMA Design B for a hard-starting load such as a loaded conveyor or positive-displacement pump risks stall; verify starting-torque adequacy and specify Design C or D where the load demands it. {note}
+
+```datasheet
+label: NEMA design letter
+type: radio
+options:
+ - Design B (normal torque, low slip - general purpose pumps and fans)
+ - Design C (high starting torque - conveyors, reciprocating loads)
+ - Design D (high slip - high-inertia loads)
+default: Design B (normal torque, low slip - general purpose pumps and fans)
+```
+
+# Efficiency {toc}
+
+## Motors 1 HP through 500 HP shall be NEMA Premium (IE3) efficiency unless the Contract Documents require NEMA Premium 4 (IE4).
+
+## Nominal full-load efficiency shall meet or exceed the value listed in ASHRAE 90.1 Table 10.8-1 for the motor's horsepower, pole count, and enclosure.
+
+## Representative NEMA Premium minimum efficiencies for 4-pole, 460 V, TEFC motors are 91.7% at 10 HP, 94.5% at 50 HP, 95.0% at 100 HP, and 95.4% at 200 HP. {note}
+
+## Failing to require an IEEE 112 Method B certified efficiency report means ASHRAE 90.1 and EISA compliance cannot be confirmed at equipment approval; the report is the only verifiable proof at submittal time. {note}
+
+```datasheet
+label: Efficiency class
+type: radio
+options:
+ - NEMA Premium (IE3)
+ - NEMA Premium 4 (IE4)
+default: NEMA Premium (IE3)
+```
+
+# Enclosure {toc}
+
+## The motor enclosure shall be selected for the installed environment so that the motor's protective rating equals or exceeds the exposure at its location.
+
+## Open drip-proof (ODP) enclosures are suitable only for clean, dry, sheltered indoor mechanical rooms; totally enclosed fan-cooled (TEFC) enclosures suit outdoor, wet, and dirty locations. Specifying an ODP enclosure for an outdoor, wet, or dirty location is a recurring error; such locations require TEFC (NEMA 3R or better) as a minimum. {note}
+
+## Motors in corrosive or washdown environments shall be furnished with a NEMA 4X enclosure or stainless-steel construction with corrosion-resistant hardware.
+
+## Motors in classified hazardous locations shall be furnished as explosion-proof, listed for the specific Class and Division of the area.
+
+## Motors furnished under [[sync/hvac-fans]], [[sync/hvac-pumps]], and [[sync/fire-pumps]] shall use the enclosure type appropriate to their installed environment as defined in those standards and this section.
+
+```datasheet
+label: Enclosure type
+type: select
+options:
+ - Open drip-proof (ODP) - clean dry indoor
+ - Totally enclosed fan-cooled (TEFC) - general outdoor/wet/dirty
+ - Totally enclosed non-ventilated (TENV) - low-output enclosed
+ - TEFC NEMA 4X / stainless - corrosive or washdown
+ - Explosion-proof NEMA 7/9 - hazardous (classified) locations
+default: Totally enclosed fan-cooled (TEFC) - general outdoor/wet/dirty
+```
+
+# Insulation and Thermal Rating {toc}
+
+## Motor windings shall be insulated with Class F (155 °C) insulation system limited to a Class B (130 °C) temperature rise at the rated load and a 40 °C ambient.
+
+## Class F insulation operated at a Class B rise provides a built-in 25 °C thermal margin and is the de facto standard; this combination, not bare "Class B insulation," is what gives motors usable thermal headroom in service. {note}
+
+## Specifying only "Class B insulation" without the rise qualification yields a motor with no practical thermal margin and is a common pitfall; always pair the insulation class with the allowable rise. {note}
+
+## Motors for high-ambient or high-altitude service shall use Class H (180 °C) insulation where required to maintain the thermal margin.
+
+```datasheet
+label: Insulation class and temperature rise
+type: radio
+options:
+ - Class F insulation / Class B rise (standard)
+ - Class F insulation / Class F rise
+ - Class H insulation / Class B rise (high ambient or altitude)
+default: Class F insulation / Class B rise (standard)
+```
+
+# Service Factor and Starting Method {toc}
+
+## Across-the-line general-purpose motors shall have a service factor of 1.15.
+
+## HVAC fan and pump motors shall have a service factor of 1.25 where specified.
+
+## VFD-driven inverter-duty motors shall have a service factor of 1.0.
+
+## A NEMA MG 1 Part 31 inverter-duty motor is rated at service factor 1.0; running a service-factor-1.15 standard motor above nameplate HP on a VFD voids the manufacturer's thermal model and is a frequent specification error. {note}
+
+## The motor shall be compatible with the starting method serving it - across-the-line, wye-delta, autotransformer, soft start, or VFD - and shall be coordinated with the controller furnished under [[sync/combination-motor-starters]] or [[sync/motor-control-centers]].
+
+```datasheet
+label: Service factor
+type: radio
+options:
+ - "1.0 (inverter-duty / VFD-driven)"
+ - "1.15 (across-the-line general purpose)"
+ - "1.25 (HVAC fan and pump duty)"
+default: "1.15 (across-the-line general purpose)"
+```
+
+```datasheet
+label: Starting method
+type: select
+options:
+ - Across-the-line (full voltage)
+ - Wye-delta (reduced voltage)
+ - Autotransformer (reduced voltage)
+ - Solid-state soft starter
+ - Variable frequency drive (VFD)
+default: Across-the-line (full voltage)
+```
+
+# Inverter-Duty Requirements {toc}
+
+## Every motor driven by a variable frequency drive shall be rated inverter-duty in conformance with NEMA MG 1 Part 31.
+
+## Inverter-duty motors shall withstand repetitive voltage spikes of not less than 1,600 V peak at the motor terminals per NEMA MG 1 Part 31.
+
+## Inverter-duty motors shall be suitable for constant-torque operation over the speed range required by the driven load, up to the 1000:1 range contemplated by NEMA MG 1 Part 31.
+
+## Omitting the inverter-duty requirement on VFD-driven motors is a serious pitfall: reflected voltage spikes on long drive cable runs stress standard winding insulation and cause premature failure. {note}
+
+## Where the cable run between the drive and an inverter-duty motor exceeds the drive manufacturer's reflected-wave limit, a dV/dt reactor or output filter shall be provided under [[sync/low-voltage-variable-frequency-drives]].
+
+```datasheet
+label: Inverter-duty rating (VFD-driven motors)
+type: radio
+options:
+ - NEMA MG 1 Part 31 inverter-duty
+ - IEEE 841 severe-duty inverter-rated
+ - Not applicable (not VFD-driven)
+default: Not applicable (not VFD-driven)
+```
+
+# Frame, Mechanical Construction, and Bearings {toc}
+
+## Motors shall be furnished in NEMA T-frame dimensions unless the driven equipment requires an IEC metric frame for dimensional compatibility.
+
+## NEMA T-frame is the default for North American equipment; IEC metric frames appear on imported packaged equipment and differ in shaft height, bolt pattern, and shaft diameter, which causes field rework if mixed with NEMA-dimensioned bases without coordination. {note}
+
+## IEC-frame motors shall not be substituted onto NEMA-dimensioned bases or couplings without verified dimensional coordination of shaft height, bolt circle, and shaft diameter.
+
+## Bearings shall be anti-friction ball or roller bearings sized for the driven load and the coupling or belt arrangement.
+
+## Motors 200 HP and smaller for general-purpose service shall have pre-lubricated, sealed bearings.
+
+## Motors above 200 HP and high-speed motors shall have external grease fittings with relief provisions.
+
+## The conduit box shall be rotatable in 90-degree increments where the motor orientation is not fixed at the time of bid, so conduit can enter cleanly without a change order. {note}
+
+## The conduit box shall be sized to accept the branch-circuit raceway furnished under [[sync/raceways-and-conduit]] and the conductors furnished under [[sync/conductors-and-cables]], with motor leads not less than 18 in long.
+
+```datasheet
+label: Motor frame standard
+type: radio
+options:
+ - NEMA T-frame
+ - IEC metric frame
+default: NEMA T-frame
+```
+
+```datasheet
+label: Bearing lubrication
+type: radio
+options:
+ - Pre-lubricated sealed (general purpose, ≤200 HP)
+ - External grease fittings with relief (>200 HP or high speed)
+default: Pre-lubricated sealed (general purpose, ≤200 HP)
+```
+
+```datasheet
+label: Conduit box
+type: radio
+options:
+ - Rotatable conduit box (orientation flexible)
+ - Fixed conduit box (orientation known)
+default: Rotatable conduit box (orientation flexible)
+```
+
+# Nameplate {toc}
+
+## Each motor shall bear a permanently attached, corrosion-resistant nameplate stamped or engraved with all data required by NEMA MG 1 Section 10.40.
+
+## The nameplate shall show, at minimum, the manufacturer, HP, voltage, phase, frequency, full-load amperes, full-load speed, NEMA design letter, service factor, insulation class, frame size, enclosure type, and nominal efficiency.
+
+## The nameplate shall remain legible for the life of the motor and shall not be painted over during installation or finishing.
+
+## A permanently legible, corrosion-resistant nameplate is the primary traceability record for the motor throughout its service life; it is the first reference used during warranty claims, replacement-part ordering, and accident investigation, and a nameplate that has corroded, fallen off, or been painted over forces the owner to rely on as-built documentation that is rarely complete. {note}
+
+# Branch Circuit and Protection Coordination {toc}
+
+## Branch-circuit conductors serving each motor shall be sized at not less than 125% of the motor full-load current taken from NEC Table 430.250, not from the motor nameplate FLA.
+
+## Sizing conductors from the nameplate FLA rather than the NEC Table 430.250 value generates RFIs because the installing electrician sizes per the code table; always coordinate equipment schedules to the table value. {note}
+
+## Motor overload protection shall be set at not more than 115% of the motor nameplate full-load current for motors with a service factor of 1.15 or greater or a marked temperature rise not over 40 °C, and at not more than 125% for all other motors, per NEC 430.32.
+
+## Branch-circuit short-circuit and ground-fault protection shall be sized per NEC 430.52 for the motor design letter and the protective-device type, recognizing locked-rotor inrush of approximately 600–700% of full-load current for NEMA Design B motors.
+
+## Branch-circuit conductor sizing, overload protection, and short-circuit protection are coordinated through [[sync/combination-motor-starters]] or [[sync/motor-control-centers]] and the conductors furnished under [[sync/conductors-and-cables]]. {note}
+
+# Testing {toc}
+
+## The manufacturer shall perform routine factory tests on each motor including no-load current, locked-rotor current, and winding resistance per phase, with phase-to-phase resistance balanced within 2%.
+
+## A certified IEEE 112 Method B efficiency test report shall be furnished for the motor model to substantiate the specified efficiency class.
+
+## The Contractor shall perform an insulation-resistance (megger) test on each motor before energization and shall record a value not less than 1 MΩ per kV of rated voltage plus 1 MΩ, per IEEE 43.
+
+## The Contractor shall verify direction of rotation before coupling the motor to the driven load.
+
+## The Contractor shall record the no-load running current on each phase after the rotation check and shall confirm the phase currents are balanced within the manufacturer's tolerance.
+
+## For motors larger than 100 HP, the Contractor shall perform a thermal scan after not less than one hour of loaded operation and shall record bearing and frame temperatures.
+
+## All testing and commissioning shall be performed under an electrical safety program complying with NFPA 70E, with arc-flash and shock protection appropriate to the available incident energy. {note}
+
+```datasheet
+label: Field acceptance tests required
+type: checkbox
+options:
+ - Insulation resistance (megger) per IEEE 43
+ - Direction-of-rotation check before coupling
+ - No-load running current balance
+ - Thermal scan after 1 hour loaded (>100 HP)
+```
+
+# Installation {toc}
+
+## Motors shall be installed in accordance with the manufacturer's instructions and aligned to the driven equipment within the coupling or belt manufacturer's tolerance.
+
+## Direct-coupled motors shall be aligned for angular and parallel offset using a dial indicator or laser alignment tool, and the alignment shall be recorded.
+
+## Belt-driven motors shall be installed with sheaves aligned and belt tension set to the belt manufacturer's recommendation.
+
+## Each motor frame shall be bonded to the equipment grounding conductor in accordance with [[sync/grounding-and-bonding]].
+
+## Motors with external grease fittings shall be lubricated at startup with the lubricant type and quantity recommended by the manufacturer, and the lubrication shall be recorded.
+
+# Delivery, Storage, and Handling {toc}
+
+## Motors shall be delivered in the manufacturer's original packaging with shaft locks or bracing in place where provided for shipment.
+
+## Motors shall be stored indoors in a clean, dry, vibration-free location with space heaters energized where furnished, until installation.
+
+## Motors stored longer than the manufacturer's recommended period shall have their shafts rotated periodically and their insulation resistance verified before energization to confirm no moisture ingress.
+
+# Warranty {toc}
+
+## The motor manufacturer shall warrant each motor against defects in materials and workmanship for not less than one year from the date of Substantial Completion.
+
+## Severe-duty (IEEE 841) motors shall carry the manufacturer's standard severe-duty warranty of not less than three years.
+
+## The warranty shall cover repair or replacement of the defective motor, including removal and reinstallation labor where the defect is attributable to the manufacturer.
+
+```datasheet
+label: Warranty period
+type: radio
+options:
+ - 1 year (standard general purpose)
+ - 3 years (IEEE 841 severe duty)
+ - 5 years (extended, owner option)
+default: 1 year (standard general purpose)
+```
+
+# Spare Parts {toc}
+
+## The Contractor shall furnish the manufacturer's recommended spare-parts list for motors larger than 50 HP, including bearings and, where applicable, space heaters.
+
+## Where the owner's standard requires stocked spares, the Contractor shall furnish one spare bearing set for each motor size 50 HP and larger installed in critical process or life-safety service.
+
+```datasheet
+label: Spare parts to furnish
+type: checkbox
+options:
+ - Spare bearing set (motors >50 HP)
+ - Spare space heater (where furnished)
+ - Manufacturer's recommended spares list
+```