Proper motor installation and mounting position is essential in obtaining top-quality operation, efficient performance, and maximum reliability.  Sometimes, however, there is confusion about the many different ways a motor can be installed.  

There are two different standards—NEMA and IEC—  which you will see when looking at electric motor mounting positions.  Although they are generally comparable, there are slight differences between the two.

The standard IEC mounting position places the junction box on the top of the motor, known as the IM B3 mounting position in IEC frame (or F3 in NEMA frames).  On the other hand, the NEMA standard mounting position is referred to as F1, with the junction/conduit box located on the left side of the motor facing the output shaft.    

The design of  most motors is such that they can usually be operated in many mounting positions, unless indicated otherwise.  Some mounting positions, however, require additional construction modifications to achieve optimal performance.  For example, shaft-up or shaft-down outdoor applications may require drilling of additional drain holes, drip covers and stronger bearings to support heavy loads.  Don't just assume you can bolt any motor in any orientation!

Below is a visual reference of typical electric motor mounting positions.  Whether you're an installer, engineer, or maintainer, this is a must -have reference.

Motor Mounting Arrangements (IEC standard 60034-7)

IM Ref# Shaft Feet Mount
IM Ref# Shaft Feet Mount
IM 1001 / IM B3 Horizontal on Floor Foot
IM 1071 / IM B8 Horizontal on ceiling Foot
IM 1051 / IM B6 Horizontal Wall mounted (feet lhs when viewed from drive end) Foot
IM 1011 / IM V5 Vertical on wall Foot
IM 1061 / IM B7 Horizontal Wall mounted (feet rhs when viewed from drive end) Foot
IM 1031 / IM V6 Vertical on wall Foot
IM 3001 / IM B5 Horizontal Flange
IM 2001 / IM B35 Horizontal on Floor Flange
IM 3011 / IM V1 Vertical (facing down) Flange
IM 2011 / IM V15 Vertical (facing down) on wall Flange
IM 3031 / IM V3 Vertical (facing up) Flange
IM 2031 / IM V36 Vertical (facing up) on wall Flange
IM 3601 / IM B14 Horizontal Face
IM 2101 / IM B34 Horizontal on wall Face
IM 3611 / IM V18 Vertical (facing down) Face
IM 2111 / IM V58 Vertical (facing down) on wall Face
IM 3631 / IM V19 Vertical (facing up) Face
IM 2131 / IM V69 Vertical (facing up) on wall Face
IM 9101 / IM B9 Horizontal threaded tie rods No drive end shield
IM 1201 / IM B15 Horizontal feet and threaded tie rods No drive end shield


Drives and Automation Ltd are a ‘one-stop’ independent shop for a full range of industrial automation products and system integration services. We provide drive modules, motors, control systems and PLC / SCADA solutions. Independent advice is provided on the most suited product by application. In addition we offer a variety of drive accessories.  We are the UK agent for the Sicme Motori range of AC and DC motors.