G106A Revision

In which of the following wiring systems can you not use building wire?

• Steel conduit

• Metal trunking

• Cable tray

• PVC conduit

The main difference between a flexible cord and a flexible cable is:

• a flexible cable is not made of copper

• a flexible cord has only three cores

• a flexible cord has fewer conductor strands

• a flexible cable has fewer conductor strands

All cords must be tested for polarity, continuity and insulation. What is an acceptable reading when testing the continuity of each conductor?

• 500 V

• 0.5 ohms or greater

• Infinity

• 1 ohm or less

What does MIMS stand for?

• Mineral insulated metal sheathed

• Metal insulated metal sheathed

• Material insulated metal sheathed

• Mineral insulated material sheathed

In a catenary system, it is important to have a loop at one or either ends of the cable. Why?

• So that birds can sit and not damage the rest of the cable

• To cause any water gathered to run onto the ground

• For expansion and contraction during hot and cold days

• To provide extra cable in case it needs to be joined

Sheathed cables have the advantage of insulation protection, but they also have another advantage. What is this?

• Increased thermal inertia

• Lower insulation resistance

• Mechanical protection

• Lower conductivity

Thermoplastic insulated cable (TPI) has an industry trade name. What is it?

• Twisted single core

• XLPE

• Building wire

• Extention wire

The colour of the sheath varies, and usually indicates the type of installation a cable is suited to. Commonly used colours include white, orange and grey. Where would you see or use red?

• Solar PV systems

• Emergency lighting systems

• Hospital wiring systems

• Fire systems

The most important precaution when cutting holes in buildings and structures is:

• preserving the building’s integrity

• consulting with authorities

• making sure your drill is sharp

• using a suitable wiring system

Assuming there are no electronic devices present in the installation, what would be the test voltage on the insulation resistance tester if you were testing a single-phase lighting circuit?

• 3 ohm

• 500 V d.c.

• 230 V a.c.

• 1000 V d.c.