Weidmuller gets UL approval for multiple wire termination, contact for screw clamp terminals

The Weidmuller line of screw clamp terminals, the W-Series, received an Underwriters Laboratory (UL) approval for the use of multiple wires per contact in one terminal.


The Weidmuller line of screw clamp terminals, the W-Series, received an Underwriters Laboratory (UL) approval for the use of multiple wires per contact in one terminal. The new approval, UL 1059, assures users that the approved terminals are acceptable for use in applications that may require more than one conductor per clamp, Weidmuller says.

Weidmuller W-Series clamping yoke screw connection terminal blocks

Weidmuller W-Series clamping yoke screw connection terminal blocks

For end users that follow NFPA 79 industrial control panel wiring practices, terminal blocks can only accommodate one conductor under a clamping mechanism. However, for OEMs who follow NEC guidelines, more than one conductor per terminal point may be used, Weidmuller says. The OEM must calculate and determine the correct combination of multiple wire sizes to be clamped. An error in calculation could potentially lead to future failures if the wrong combination is used in the terminal clamp.

This new rating provides OEM users of Weidmuller's W-Series terminals a savings in time and materials, the company says. It reduces the number of terminals required for applications that would normally require one terminal for each conductor. In addition, for users that follow the NEC guidelines, Weidmuller provides a guide that details the approved number of wires, per wire size, for each terminal block.

The UL 1059 approved W-Series terminals include TS-35 DIN-rail mounted feed-through, ground, fuse, disconnect, branch and dual lever configuration types with electrical ratings of 300-600V, 10 - 175A and 22 - 2/0 AWG.

Learn from from Weidmuller about the UL 1059 approved Weidmuller W-Series screw clamp terminal blocks .

To see the certification, at Underwriters Laboratory site search the Online Certifications Directory for Weidmuller file number E60693.

Learn more from Control Engineering about fast, flexible terminal blocks .

- Edited by Mark T. Hoske, editor in chief, Control Engineering , www.controleng.com

No comments
The Top Plant program honors outstanding manufacturing facilities in North America. View the 2013 Top Plant.
The Product of the Year program recognizes products newly released in the manufacturing industries.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
A cool solution: Collaboration, chemistry leads to foundry coat product development; See the 2015 Product of the Year Finalists
Raising the standard: What's new with NFPA 70E; A global view of manufacturing; Maintenance data; Fit bearings properly
Sister act: Building on their father's legacy, a new generation moves Bales Metal Surface Solutions forward; Meet the 2015 Engineering Leaders Under 40
Cyber security cost-efficient for industrial control systems; Extracting full value from operational data; Managing cyber security risks
Drilling for Big Data: Managing the flow of information; Big data drilldown series: Challenge and opportunity; OT to IT: Creating a circle of improvement; Industry loses best workers, again
Pipeline vulnerabilities? Securing hydrocarbon transit; Predictive analytics hit the mainstream; Dirty pipelines decrease flow, production—pig your line; Ensuring pipeline physical and cyber security
Upgrading secondary control systems; Keeping enclosures conditioned; Diagnostics increase equipment uptime; Mechatronics simplifies machine design
Designing positive-energy buildings; Ensuring power quality; Complying with NFPA 110; Minimizing arc flash hazards
Building high availability into industrial computers; Of key metrics and myth busting; The truth about five common VFD myths

Annual Salary Survey

After almost a decade of uncertainty, the confidence of plant floor managers is soaring. Even with a number of challenges and while implementing new technologies, there is a renewed sense of optimism among plant managers about their business and their future.

The respondents to the 2014 Plant Engineering Salary Survey come from throughout the U.S. and serve a variety of industries, but they are uniform in their optimism about manufacturing. This year’s survey found 79% consider manufacturing a secure career. That’s up from 75% in 2013 and significantly higher than the 63% figure when Plant Engineering first started asking that question a decade ago.

Read more: 2014 Salary Survey: Confidence rises amid the challenges

Maintenance and reliability tips and best practices from the maintenance and reliability coaches at Allied Reliability Group.
The One Voice for Manufacturing blog reports on federal public policy issues impacting the manufacturing sector. One Voice is a joint effort by the National Tooling and Machining...
The Society for Maintenance and Reliability Professionals an organization devoted...
Join this ongoing discussion of machine guarding topics, including solutions assessments, regulatory compliance, gap analysis...
IMS Research, recently acquired by IHS Inc., is a leading independent supplier of market research and consultancy to the global electronics industry.
Maintenance is not optional in manufacturing. It’s a profit center, driving productivity and uptime while reducing overall repair costs.
The Lachance on CMMS blog is about current maintenance topics. Blogger Paul Lachance is president and chief technology officer for Smartware Group.