Splicing and Terminating (Low Voltage) Flashcards

1
Q

What are four classes of electrical terminations or connections?

A
  • Soldered
  • Fused
  • Mechanical
  • Compression
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2
Q

Four common issues arise when splicing and terminating aluminum conductors; what are these issues?

A
  • Oxidation
  • Thermal expansion
  • Cold flow
  • Galvanic corrosion
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3
Q

When terminating a stranded conductor, what is an important rule to prevent arc faults and maintain conductor ampacity?

A

Confine all strands in termination or connection.

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4
Q

Why should one never ring (strip insulation at 90 degrees) a conductor?

A

The conductor loses ampacity and metallic strength if cut into.

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5
Q

What is the difference between splices, taps and terminations?

A
  • A splice is when two or more conductors of equal size and ampacity are joined
  • A tap is a splice which contains at least one differently sized wire
  • A termination is the secure connection of a conductor and it’s final destination.
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6
Q

What is exothermic welding most often used for?

A

To make grounding and bonding connections.

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7
Q

What is a major cause of equipment failure, in relation to wire connections?

A

Faulty soldering

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8
Q

What can one use to re-insulate a splice or tap?

A
  • Electrical tape
  • Splicing compound
  • Heat shrinkable tubing and caps
  • Preformed insulating covers and boots
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9
Q

Why would one use vinyl tape to cover rubber tape for a waterproof insulation of a splice outside?

A

Because UV light from the sun damages rubber tape.

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10
Q

Could one cause damage by over tightening a bolted termination?

A

Yes, it is sometimes necessary to use a torque wrench.

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11
Q

How must a conductor be oriented under a wire binding screw?

A

So that the tightening of the screw pulls the wire in.

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12
Q

Must one always use a compatible die when using compression terminals?

A

Yes, otherwise the connection may be poor.

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13
Q

When would a set screw connector be used?

A

When a splice is meant to be taken apart or if vibrations are frequent.

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14
Q

Why could one require a file when splicing with a split bolt?

A

Because a sharp edge could rip the tape re insulation.

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15
Q

How should one remove insulation from an aluminum conductor?

A

By pencilling (@30°), Aluminium is much softer and more susceptible to damage than copper.

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16
Q

When making an open air connection between aluminum and copper conductors, which conductor should be placed above the other?

A

Aluminum so that the copper oxide salts will not cause corrosion to the aluminum.

17
Q

When re insulating, what material ratings must be at least equal to the original insulation ratings?

A
  • Voltage
  • Temperature
18
Q

What tool should be used to remove the outer covering of non metallic sheathed cable?

A

A knife.