Splicing and Terminating (Low Voltage) Flashcards
What are four classes of electrical terminations or connections?
- Soldered
- Fused
- Mechanical
- Compression
Four common issues arise when splicing and terminating aluminum conductors; what are these issues?
- Oxidation
- Thermal expansion
- Cold flow
- Galvanic corrosion
When terminating a stranded conductor, what is an important rule to prevent arc faults and maintain conductor ampacity?
Confine all strands in termination or connection.
Why should one never ring (strip insulation at 90 degrees) a conductor?
The conductor loses ampacity and metallic strength if cut into.
What is the difference between splices, taps and terminations?
- 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.
What is exothermic welding most often used for?
To make grounding and bonding connections.
What is a major cause of equipment failure, in relation to wire connections?
Faulty soldering
What can one use to re-insulate a splice or tap?
- Electrical tape
- Splicing compound
- Heat shrinkable tubing and caps
- Preformed insulating covers and boots
Why would one use vinyl tape to cover rubber tape for a waterproof insulation of a splice outside?
Because UV light from the sun damages rubber tape.
Could one cause damage by over tightening a bolted termination?
Yes, it is sometimes necessary to use a torque wrench.
How must a conductor be oriented under a wire binding screw?
So that the tightening of the screw pulls the wire in.
Must one always use a compatible die when using compression terminals?
Yes, otherwise the connection may be poor.
When would a set screw connector be used?
When a splice is meant to be taken apart or if vibrations are frequent.
Why could one require a file when splicing with a split bolt?
Because a sharp edge could rip the tape re insulation.
How should one remove insulation from an aluminum conductor?
By pencilling (@30°), Aluminium is much softer and more susceptible to damage than copper.
