NEETS MODULE 4; CHAPTER 2 Flashcards
Western union splice?
Western Union splice joins small, solid conductors.
Bring the wires to a crossed position and make a long twist or bend in each wire
Staggering Splices?
A smoother and less bulky joint can be made by
staggering the splices.
Short is connected to long end.
Rattail Joint?
You then twist the wires to form the rattail effect. This type of splice will not
stand much stress
Fixture Joint?
he first step is to remove the
insulation and clean the wires to be joined. After the wires are prepared, the fixture wire
is wrapped a few times around the branch wire. The end of the branch wire is then bent
over the completed turns. The remainder of the bare fixture wire is then wrapped over the
bent branch wire. Soldering and taping completes the job
Knotted Tap Joint splice?
The main wire, to which the branch wire is to be tapped, has about 1 inch of insulation
removed. The branch wire is stripped of about 3 inches of insulation.
what device is commonly used to replace the rat tail splice?
wire nut
The ____ splice is used extensively to join large conductors.
split bolt
Why are the ends of the wire clamped down after a Western Union splice is made?
To prevent damage to the tape insulation
Why are splices staggered on multiconductor cables?
To prevent the joint from being bulky.
An advantage of the crimp-on solderless terminal lugs?
is that they require relatively little
operator skill to use.
Another advantage is that the only tool needed is the crimping tool.
. What are the two types of insulation most commonly used for noninsulated splices
and terminal lugs?
Spaghetti or heat-shrinkable tubing.
What is the maximum allowable temperature that should be used on heat-shrinkable
tubing?
300º F
electrolysis?
Electrolysis
is the chemical action that takes place when an electric current passes through two
dissimilar metals. This chemical action corrodes (eats away) the metal.
The use of ______ terminal lugs and splices has become the most common method
for copper wire termination and splicing in recent years.
preinsulated
What is the most common method of terminating and splicing wires?
The use of preinsulated splices and terminal lugs.
Why are preinsulated terminal lugs and splices color coded?
To identify wire sizes they are to be used on.
Why must items to be soldered be cleaned just prior to the soldering process?
. Solder will not adhere to dirty, greasy, or oxidized surfaces
What does “tinning” mean in relationship to soldering?
The coating of the material to be soldered with a light coat of solder
How much of the stripped length of a conductor should be tinned?
One-half the stripped length.
A soldering gun should NOT be used on what components?
Electronic components, such as resistors, capacitors, and transistors
What two metals are used to from soft solder?
Tin and lead
. What is the tin-lead alloy percentage of solder used for electrical connectors,
splices, and terminal lugs?
60-percent tin and 40-percent lead (60/40 solder)
What purpose does flux serve in the soldering process?
It cleans the metal by removing the oxide layer and prevents further oxidation
during the soldering
Why are solvents used in the soldering process?
To remove contaminants from soldered connections.
