ELECTRICAL
INSTALLATION
AND
MAINTENANCE
Grade 7
Module 1 – Lesson 2
Identify electrical supplies, materials, and
tools
COMMON WIRE SPLICES AND JOINTS
A. Rat Tail or Pig Tail
- This kind of joint is commonly used to join two or more conductors inside the
junction box. It is suitable for service where there is no mechanical stress when
wires are to be connected in an outlet box, switch, or conduit fitting.
B. Y-splice
- This method of wrapping is generally used on small cables because the strands
are flexible and can all be wrapped in one operation.
C. Knotted tap
- This is used where the tap wire is under heavy tensile stress.
D. Plain tap joint
- This is used where the tap wire is under considerable tensile stress circuit.
E. Aerial tap
- This is used as a temporary tap usually done in constructions sites. The easy twist
will facilitate tap wire movement.
F. Duplex cross joint
- This is a two-tap wire turned simultaneously and is used where the two tap wire is
under heavy tensile stress.
G. Western Union Short-tie Splice
- This is the most widely used splice or joint in interior wiring installation to extend
the length of wire from one point to another.
H. Western Union Long Tie
- This is used extensively for outside wiring to extend the length of wire from one
end to another.
I. Cross joint
- The same application is done as in plain tap but the only difference is that this tap
is a combination of two plain taps placed side by side with each other.
J. Wrapped Tap or Tee Joint
- This is used on large solid conductors where it is difficult to wrap the heavy tap
wire around the main wire
ASSESSMENT:
Direction. Identify each of the following wire splices and joints.
1.
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2.
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3.
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4.
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5.
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6.
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7.
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8.
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9.
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10.
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ACTIVITY:
DIRECTIONS: Below are pictures of common wire splices and joints used in electrical
wiring installations. Practice doing the task by following the steps given. Your
performance will be judged using the rubric.
Steps in splicing a rat tail joint
Steps in splicing a y-splice joint
Steps in splicing a knotted tap joint
Steps in splicing a plain tap joint
Steps in splicing a aerial tap joint
Steps in splicing a duplex cross joint
Steps in splicing a western union short-tie joint
Steps in splicing a western union long-tie joint
Steps in splicing a cross joint
Steps in splicing a wrap tap or tee joint