3M™ Bus Bar Splice with Scotch® Rubber Mastic Tape 2228 – Training

3M™ Bus Bar Splice with Scotch® Rubber Mastic Tape 2228 – Training


Protect the bus bar splice by using premium
electrical tapes. To do this 3M recommends that you use Scotch
brand Varnished Cambric Tape 2510, Scotch Rubber Mastic Tape 2228, and Scotch Professional
Grade Premium Vinyl Electrical Tape Super 33 Plus. Once you have bolted the bus bars together,
you can fill in around bolts and sharp areas with an electrical putty such as 3M brand
Scotchfil Electrical Insulation Putty. This step is not required to meet ANSI requirements,
however and is not shown in this demonstration. Turn Scotch brand Varnished Cambric Tape 2510
adhesive side out. Position it two inches past the bus bar junction
and begin wrapping towards the bolts. The varnished cambric tape provides important
puncture protection. Applying it adhesive side out allows quick
and easy re-entry to the connection if needed. Let the edge of the tape overlap the edge
of the previous wrap of the tape. We call this method half-lapping the tape. Wrap diagonally to ensure you have covered
the bolts effectively. Once you’ve covered the splice and the ends
of the cable jacketing or bus bar insulation cut the tape with a sharp blade. Next you will cover the splice with Scotch
brand Rubber Mastic Tape 2228 to provide electrical insulation and a good moisture seal. Start wrapping mastic tape to one side of
the bus bar junction. Pull the rubber tape so that it stretches
slightly. The tape should be stretched to one third
its original width almost to the point of breaking. Hold the roll of tape tightly between fingers
and pass it carefully hand-to-hand so that the tape is applied with moderate tension. When applied correctly, the tape layers fuse
together. Wrap so that the tape covers half the width
of the previous layer, half-lapping as you did with the varnished cambric. Continue wrapping back and forth as required
by the voltage level noted in the instructions. For 600 volts – wrap one half-lap layer. For 5-8 kV – it should be two layers. For 15 kV – it should be three layers for
straight bar and four layers for bolted. For 25 kV – it should be five layers for straight
bar and six layers for bolted. For 35 kV – it should be seven layers for
straight bar and eight for bolted. These instructions will vary if you use Scotch
brand Linerless Rubber Splicing Tape 130C. Again, be sure to check the instructions for
details. Wrap the rubber tape at least an inch over
the cable jacketing or bus bar insulation. It is especially important to overwrap the
insulating tape with premium vinyl electrical tape when the connection is in an exposed
area. Start taping with Scotch brand Premium Vinyl
Electrical Tape Super 33 Plus. Pull the tape roll so that the vinyl tape
stretches and goes on with tension, squeezing the rubber tape below, half-lap the tape. The tape should extend at least an inch over
the cable jacketing or bus bar insulation. Once you have applied a minimum of two half-lap
layers, let the tension out of the tape in your hand and cut it with a sharp blade, thumb
down. Wrap the remaining end without stretching
it. When applied correctly, these layers of tape
will help protect the splice. But if you need to remove the splice, just
slice through the tape layers with a sharp blade. They should peel off easily since layers were
adhered to each other and not to the splice.

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  1. Talk about a roller coaster ride! I had high hopes for the tape job… it started out looking like a fantastic job meant to hold for several generations to come… then all of the sudden…. BOOM!!! out comes the knife!!!! destroying the near perfect wrapping job. Thanks for the demo! God love you 3M

  2. How can I find the instruction on how many layers are needed for given voltage? Also how will I know which tape is better for my requirement?

  3. Specializing in the production of 3M replacement products, such as 3M 2228, 3M23, 3M13. Web: www.taipuchina.com

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