Troy firm’s Chinese unit builds wiring harnesses for mines

TROY–NAI, the Troy-based designer and manufacturer of custom interconnect equipment that deliver power and data, announced a new design and manufacturing project for large mining operations in China.

NAI manufacturing operations in Suzhou, China, began the development and manufacture of complex cable harnesses for installation within large explosion-proof enclosures. These cabinets are placed within mines for the operation and control of variable frequency drives and inverters. These drives power and control conveyor belts, water and oil pumps, cooling fans, tape winding devices and brakes inside the mines. In addition, they provide alerts and notifications for transformers, motors, cables and other components when they are not operating within the expected temperature range, voltage range or other parameters.

All control drives utilize rugged NAI harnesses designed specifically for mining applications. Ten different cable harnesses have been designed, each of which is used for data communications and control, some with shielding for protection against EMI. Harnesses carrying power are also now in planning and design stages. The typical data/control harness includes over 100 terminations, while the largest harness has more than 900 terminations. These assemblies have been designed to be very rugged and resilient to various tough environmental hazards.

NAI products meet the requirements of the following tests, ratings or standards:
* GB3836.2-2010 for explosive atmospheric conditions
* High voltage test at 330V for power cable
* Connectors are IP67 rated for resistance to dust and water

NAI designs and manufactures custom rugged cable assemblies and harnesses for a variety of industrial applications for mining machinery, construction and agricultural equipment, robotics, machine tools, material handling equipment, instrumentation & control and other industries with demanding requirements. Broad design capabilities, a global manufacturing footprint, rigorous Quality Management Systems, along with the ability to make things happen very quickly, combine to make NAI a totally unique and attractive supplier for interconnect solutions.

To learn more about NAI, visit

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