If you are adding to an existing Track System it is easy to Identify which of our 3 systems you have. H Type will have 3 copper contacts on the track heads and in the track. Differentiating between L Type and J Type is a little more difficult. A J Type Head will have 2 contacts. You should be able to lift one of these contacts up and down fairly easily. Below you will find measurements to assist you in identifying which system you have.

• "H" Track
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• H TYPE / 3-WIRE
  Track Head Contacts Tip to Tip: 1"
  Also a 3rd Contact for Grounding
  Track Contacts Measure Across: 15/16"
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• "J" Track  
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• J TYPE / WIDE 2-WIRE
  Track Head Contacts Tip to Tip: 1"
  1 Contact Pulls Out for 2-Circuit Track
  Track Contacts Measure Across: 7/8"
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• "L" Track 
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• L TYPE / 2-WIRE
  Track Head Contacts Tip to Tip: 7/8"
  Track Contacts Measure Across: 3/4"
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