Electrical Safety Quiz

When is a circuit main earth applied to an overhead line?

• After the issue of a safety document

• Before the issue of a safety document

• Before the line is isolated

• After the additional earths have been applied

3c 300 SAC XLPE 11Kv on a cable record means

• 3 core 300sqmm Copper unsheathed 11KV

• 3 x 1 core 300sqmm Aluminium lead sheathed 11 KV

• 3 Core 300sqmm Solid Aluminium Conductor 11KV

• 3Core 300sqmm Stranded Copper Conductor 11KV

What is the minimum open ground clearance for an LV overhead line?

• 6.4m

• 5.2m

• 2.8m

• 4.2m

Electrolytic action takes place:

• Where dissimilar metal conductors are used

• A reaction inside an overhead line transformer

• The amount of current a conductor can hold

• A low resistance joint

The purpose of screening 3-phase high voltage cables is to

• Stop electrolytic action

• Control tangential stresses

• Provide good earth continuity

• Give extra mechanical protection

Full form of PILCSTA on cables

• Paper insulated lead covered steel wire armoured

• Plastic insulated lead covered steel wire armoured

• Paper insulated lead covered steel tape armoured

• Paper insulated laminated copper steel tape armoured

When handling cold pour resins the mandatory PPE would be

• Overalls and eye protection

• Disposable gloves and breathing apparatus

• Breathing apparatus and overall

• Eye protection and disposable gloves.

Cable spiking minimizes the risk of.

• moisture

• flashover

• Results in deterioration

• puncture

What is the basic idea about a fault thrower switch?

• Introduces a phase to earth fault for remote tripping of circuit breakers

• Automatically moves the fault to another area of the system

• Automatically sends a message to the on-duty service engineer

• Ensures the fault is thrown into status of non-emergency operation

For lightening protection, a simple form of supply system mounted on pylons would be

• A surge diverter

• An expulsion gaps

• A surge inverter

• An over-running earth wire