CRSM-CT

CRSM Cable Tap Splices

An installed CRSM-CT sleeve

     Raychem's CRSM-CT is a wrap around, sealed cable tap splice.  Utilizing a rail and channel closure mechanism, CRSM is able to stay together in the shape of a tube during the shrink process while still holding onto its high expansion full recovery.

     Designed to be used on 1000 volt and lower cables, CRSM can cover a multitude of different cable sizes, removing the need to stock multiple supplied and recovered dimension products.

CRSM-CT is available in the following sizes:

CRSM-CT 34/10-150

CRSM-CT 53/13-200

CRSM-CT 84/20-250

CRSM-CT 53/13-200

CRSM - CRSM-CT

CRSM and CRSM-CT

     In the Raychem world, we have two products with very similar names:  CRSM and CRSM-CT.  What's up with that?  What do those letters stand for?  Why not use more dissimilar names because that gets kind of confusing?  I don't know any of those answers -- but I do know what CRSM and CRSM-CT stand for.

     CRSM stands for "Cable Repair Sleeve - metric" -- or alternatively:  "Cable Rejacketing Sleeve - metric".  The "CT" at the end of the CRSM-CT stands for "Cable Tap" splice.  That probably didn't help very much did it?  I think the primary difference between the two products is that the CRSM-CT (which is expected to seal between two cables as seen below) is manufactured with a significantly thicker adhesive layer.  That thicker adhesive is sufficient to fill all cracks and voids and even properly seal the area between two different cables that are running parallel to one another. 

Here you see how the adhesive thickness of the CRSM-CT is able to properly seal around two cables

     Both products utilize the same backing and the same rail and channel closure system.  In both cases, the product is rated for use at 1000 volts when in direct contact with the cable splice / the current.  When used simply as a jacket repair, however, the products are rated to 35kV.  Quite a difference depending on what the application is!  You certainly would NOT under any circumstances use this product to seal a high voltage splice.  That could be deadly.

     CRSM is available for use on cables #8 up through 2000 mcm.  CRSM-CT (on a compression connector) can be used on #8 up through 500 mcm cable.  When installing on a split connector, you (of course) need a sleeve large enough to wrap around two different cables; so in those situations you are looking at installing on connections using # through #2 cable size. 

Raychem CRSM CT Cable Tap Splices

Raychem CRSM CT Cable Tap Splices

A Heat-Shrink Wraparound Cable Tap Splices rated for use at 1000 volts.

• CRSM CT Cable Tap is used as a wraparound, sealed cable tap splice that is qualified to ANSI C119.1 rated to ICEA electrical withstand test for 1000 volts.
• CRSM CT is RUS accepted for use with compression and split-bolt connectors.
• CRSM CT is sealant-coated and for use on standard poly- or elastomeric insulated conductors.

Commonly used CRSM CT Cable Tap Compression Connector Sizes

CRSM supplied with a 34 mm id that shrinks down to 10 mm with a length of 150 mm

CRSM supplied with a 53 mm id that shrinks down to 13 mm with a length of 200 mm

CRSM supplied with a 84 mm id that shrinks down to 20 mm with a length of 250 mm

Standard Split-Bolt Connector

CRSM supplied with a 53 mm id that shrinks down to 13 mm with a length of 200 mm

How Do I Seal Parallel Wires?

Question:  How do I seal up parallel, touching wires when dealing with a tap?

Answer:  It is probably a lot easier than you think.  Raychem's CRSM is designed for applications exactly like that.  Here is a diagram of what the tap looks like after installation:

Notice the parallel wires to the left

In this case, the CRSM-CT includes (as one of the components) a sealant strip that is wrapped (in a figure-8 pattern around and through the two wires that are touching.  This (along with the adhesive of the CRSM-CT shrink sleeve) acts to encapsulate that section of the two wires and protect the connection.