Fuse Holders

Terminal Blocks

Custom Designs

AGENCY APPROVALS

The majority of products manufactured by Marathon Special Products are Underwriters Laboratories and Canadian Standards Association approved.

The approval status can be found throughout the catalog.  Listed below are the different approval forms and brief descriptions.

UL - Listed by Underwriters Laboratories, products are qualified for use in equipment without end use agency approval when applied within product's rated performance.

UR - Recognized by Underwriters Laboratories, suitable for use only on end-use equipment where Underwriters Laboratories determine acceptability of the combination.

CSA - Certified by Canadian Standards Association, suitable for use in other equipment where Canadian Standards Association determines the suitability of the combination.

- Indicates that products conform to European low voltage directive.  Declaration of conformity is available upon request.

ISO 9000 - On February 1, 1994, Marathon Special Products was registered to ISO 9002 quality standards.  We became ISO 9001 certified in August, 2003.

APPLICATIONS

In the heating and air conditioning industry, our products are primarily used in rooftop air conditioners that are installed on commercial buildings such as schools, office buildings, hospitals, and factories.  The traffic signal industry uses our terminal blocks for wiring in the traffic light itself as well as  in its control panel.  The elevator industry uses terminal blocks and fuse holders in the control panel of the elevator.

The Kulka terminal blocks are used extensively in military applications such as telecommunications and security systems.   Other equipment that uses our products are hand dryers, emergency lighting systems, subway trains, substations for car phones and control panels for machinery.

Our products are very important to our customers, insuring them that they can provide quality equipment that is safe to use.

WIRE AMPACITY

The ampacity of a wire is its current carrying capacity with reference to the cross sectional area of the conductor(s), the temperature rating of the insulation, and ambient temperature.

Marathon specified wire ranges are based on UL approved tests using 75°C wire.   Wires with temperature ratings other than 75°C are approved while observing NEC Article 310 wire tables for allowable ampacities of insulated conductors.  Marathon voltage and amperage ratings remain constant and are independent of the temperature rating of the wire used in application.  Wire gauges and type must remain within the Marathon specified ranges to be UL approved.  However, UL approval for higher currents may be obtained in some end-use applications.

TIGHTENING TORQUE

Recommended tightening torque is listed for all products, whether on the carton label or the product label.  All torque recommendations are based on UL 486.  In some cases, because of various connector designs, our recommended torque is different from the torque tables shown in UL 486.   However, these products passed the heating cycling and static heating tests as specified in UL 486.

WIRE CHART

Stranded wire sizes and ampacity for 75°C wire (copper).

Copyright © 1998 Marathon Special Products.  All rights reserved.  Information in this document is subject to change without notice.
Other products and companies referred to herein are trademarks and/or registered trademarks of their respective companies and/or mark holders.
Revised: June 19, 2007.