Basic Electrical

Question 1

What voltage is LV below ?
and what voltage is HV above?

Answer 1

LV is Below 1000V

HV is above 1000V

Question 2

What is AC ?

Answer 2

Is electrical current that continually reverts its direction in regulated periods. Voltage increases and decreases.

Question 3

What is DC ?

Answer 3

Is electrical current that flows in one direction only. DC provides a constant voltage.

Question 4

What is Step- Voltage?

Answer 4

When feet are placed on different voltage rings, electricity equal to the flow of rings will flow through the body. Eg 800-600V = 200V flowing through body

Question 5

What is Touch Potential?

Answer 5

Touch potential refers to the voltage difference between the ground and an object (like a person) that is in contact with an energized source.

Question 6

What is the safe approach distance for a fallen distribution line and a transmission line?

Answer 6

Distribution line - 8M
Transmission line - 20M

Question 7

What are some indicators of dual power supplies on properties?

Answer 7

Label on switchboard
Label at POE
Labelled isolator close to alternative supply source

Question 8

What are some alternative power supplies?

Answer 8

Solar
Wind
UPS - Uninterrupted power supply
Battery’s

Question 9

List 7 hazards that may be in a substation?

Answer 9

High Voltage,
Confined Space,
CompressedGas,
PCBS in transformers & capacitors,
Residual power after isolation – in the capacitor banks,
Oils usedfor cooling – use foam to extinguish,
Stairs close to entry.