Custom Electrical Grounds & Jumpers


Need Custom Grounds in a Hurry? We Make it Easy        

Electrical Ground Cluster

  •          Custom grounding configurator
  •         • Quick turnarounds are available for all stock items
  •         • Build to your exact specifications
  •         • From the cable to the clamp we have hundreds of products in stock
  •         • All grounds are tested by our NAIL Accredited laboratory prior to shipment

 

for information on mechanical jumpers click here.


Available for purchase or rent!
Need your Grounds Tested, Cleaned or Repaired?



  •   JM Test offers pick-up and delivery service across Southern and Mid-West US.
  •  • Ground testing, cleaning and repair can be done onsite.
  •  • Save time and money.
  •  • Recommended yearly testing.
     • Onsite Testing available, we come to you! Call us to inquire today!


    Grounds are built, repaired, and tested to ASTM Standards F855-09 and F2249-03(2009).


  • JM cleans, repairs, and visually inspects electrical grounds



  • SINGLE ASSEMBLIES. GROUND CLUSTERS. URD GROUNDS

        single assemblies ground clusters    URD grounds
    ** The clamps in any assembly can be identical or quite different depending on each grounding application. JM Test Systems stocks a wide variety of clamps for ALL applications. Clamps are offered in either bronze or aluminum alloys and are manufactured to meet the current specifications of ASTM F 855.

    To attach a clamp to the grounding cable requires the use of a ferrule. Ferrules are compressed on the strands of the cable to provide a low resistance permanent connection. The size of the ferrule is determined by the size of the cable. Ferrules are manufactured to the specifications of ASTM F 855.
    Groundn assembly checklist specify clamps, cables, ferrules

    GROUNDS SET CHECKLIST

    1. Specify the clamps. Be sure that the clamp will meet or exceed the max amperage rating of the ground cable that it will be used with.
    2. Specify the cable. Once the short circuit capacity of the system has been determined, choose the appropriate size cable. Specify the cable length, and the color of the jacket desired.
    3. Specify the ferrules. The size of the ferrules must match the size of the cable that it will be used with. Specify Copper or aluminum and shrouded or non-shrouded.
    4. Specify the options. List any optional equipment that is desired. This can include hanger studs, contact studs, heat shrink tubing, markings, clear strain relief, etc.

























  • 1. Clamps

  • multi angle grounding clamp
    MULTI ANGLE

    duck bill grounding clamp
    DUCK BILL

    electrical grounding c clamp
    C CLAMP

    ball & socket grounding clamp
    BALL & SOCKET

    flat jaw grounding clamp
    FLAT JAW

    substation grounding clamp
    SUBSTATION


    2. Cable

    Grounding Cables are made with extra flexible strand of soft drawn #30 AWG (.01”) copper and are available in three different jackets.

    The yellow thermoplastic elastomer jacketed cable is the standard for grounding service. It provides a combination of economy, flexibility, and durability. The service temperature ranges from 200º to -50ºF per ASTM F 855, Type I requirements.

    The black thermoplastic elastomer jacketed cable has a smaller diameter and thinner jacket material giving it better flexibility than the yellow cable. The service temperature ranges from 200º to -50ºF per ASTM F 855, Type I requirements.

    The PVC transparent flexible thermoplastic jacketed cable allows easy inspection for strand breakage. The flexibility decreases with low temperatures. The service temperature ranges from 140º to -40ºF per ASTM F 855, Type III requirements.

    The silicone transparent flexible thermoplastic jacketed cable allows easy inspection for strand breakage. The service temperature ranges from 302º to -40ºF per ASTM F 855, Type I requirements.
    electrical grounding equipment cables

    *Click here to view all grounding cable options.

  • 3. Ferrules


    PLAIN UNSHROUDED


    PLAIN SHROUDED


    THREADED


  • STOCKING DISTRIBUTOR FOR TOP NAMES IN THE INDUSTRY SUCH AS:
    Salisbury by Honeywell Hubbell Power Systems, Inc. Hastings Hot Line Tools and Equipment

    *LARGE STOCK OF GROUNDING CLAMPS - WE ALSO STOCK H RATED CLAMPS
    .
    ASTM F855-09 Table 1 Protective Grounding Clamp Ratings


    Build to your company's specifics.

JM Test Systems building custom grounds Large Stock Inventory for All of Your Electrical Safety Equipment Needs Grounding Clusters Made to Your Specifics

 


LITERATURE:

Salisbury Grounding Catalogs
:
1. Grounding Equipment Accessories
2. Safety Line Grounding Equipment
3. Salisbury Temporary Grounding Equipment

Chance / Hubbel Power Systems Grounding Catalogs:
1. History Of Personal Protective Grounding
2. Chance Electrical Principals
3. Chance General Instruments and Meters
4. Chance Grounding Equipment Catalog
5. Chance Grounding Applications and Considerations



JM Test Systems - Mattoon, IL

  • Products

JM Test Systems - Custom Built

 

JM Test CatalogJM Test Catelog