LUTZE DRIVEFLEX® Cable for VFD and Motor Applications

LUTZE DRIVEFLEX® Cable for VFD and Motor Applications

Variable frequency drive (VFD) cables have distinct advantages over traditional cables when used in drive and motor applications. When installed properly, VFD cables reduce cross coupling between drives and the shield contains and drains the electrical noise created by the drive. Their noise mitigation helps with the proper function of adjacent control systems and they help to reduce motor shaft voltage and bearing currents.

LUTZE DRIVEFLEX® cables are designed to cope with the power distortions in VFD applications. They offer superior electrical values for VFD or servo applications and are UL listed type “Flexible VFD Servo Cable, Flexible Motor Supply Cable” to comply with codes and standards regarding electrical wiring of VFDs. DRIVEFLEX® XLPE insulation has very low capacitance, high impedance and high voltage breakthrough resistance.  DRIVEFLEX® cables are safer and more efficient compared with traditional PVC/Nylon power tray cables or THHN wires in conduit.

LUTZE has recently expanded their DRIVEFLEX® line to include series A106 and A107, which are smaller diameter, general purpose series drive cables. Which type you use will depend on your specific project and requirements.

  • A106 series is great for most VFD applications and motors up to 40 HP and features a small outer diameter (OD) for easy routing and use in conduit.
  • A107 series cable is similar to the A106, but includes one shielded pair for brake or control signals.

Don’t trust your VFD and motor operations to tray cable or THHN.  Interested in learning more about DRIVEFLEX® or ordering it for your next project? Give your French Gerleman Account Manager a call today!

MCI-A Cables – Perfect Marriage of AC and MC Style Cables

What’s the Differences Between AC and MC Cables?

The current construction of Armored Cables (Type AC) that is approved by UL 4, has an aluminum bonding wire in contact with the metal armor that provides a low-impedance ground path that is required for the proper operation of overcurrent protection devices. This style cable was in use for many years before the introduction of Metal Clad Cables (Type MC).

Traditional Metal Clad Cables utilize one or more green copper grounding conductors and the armor is not an approved equipment grounding means. This is one of the major differences between the two styles of cable. In addition, Type MC Cables also utilize a polypropylene assembly tape rather than the Kraft paper tape on individual conductors that is used on traditional Type AC cables.

As technology advanced, so too did the construction of Metal Clad Cables. Over the years, contractors realized the benefits to using Type MC cable versus Type AC, however, the need for the armor to be an approved equipment ground still persisted.

The birth of MCI-A Style Cables

In the late 2000s, a new style of Type MC Cable was designed that incorporated full-sized bare aluminum ground wire plus the armor as the equipment grounding means. This cable was referred to as Type MCI-A, referencing the style of fitting needed in order to ensure the bonding wire was properly installed. The MCI-A cables are the ideal fit for a contractor that prefers Type MC Cables with the benefit of the armor/ bond wire ground path. An additional benefit of MC Cables is that you are not limited to the number of conductors within the armor. Per UL 4, AC cables may only have a maximum of four circuits, whereas this limitation does not apply to MC Cables.

Special attention should be paid to terminating Type MCI-A cables as the aluminum bonding wire must maintain contact with the armor upon termination. There are several ways to do this, as noted by AFC Cable Systems installation instructions. MCI-A style cables are now common in the electrical industry and also come in healthcare facility (HCF) versions.

AFC Cable Systems introduced their Type MCI-A style cables in 2012, MC-Quik® Cable and MC-Stat® Cable for healthcare. In addition to the armor/ bond wire ground path, AFC also provides labor savings to the contractor by eliminating the overall polypropylene assembly tape, instead a protective covering is extruded directly onto each individual conductor. Removing the overall tape eliminates the time to remove it to access the conductors and eliminates the waste of the scrap.

For more information on AFC Cable’s Type MCI-A products, contact your French Gerleman Account Manager or go to