Three methods that protect against DIRECT CONTACT
Obstacles
Placing out of Reach
Barriers
Four methods that protect against INDIRECT CONTACT
Extra Low Voltage use
Electrical Separation
Auto disconnect of supply
Using Class II Equipment
The temperature limit for parts of hand held metallic electrical equipment within 2 meters (Arm’s reach)
55°C
Overcurrents can be protected by...
Automatic disconnection when overcurrent occurs
Limiting max overcurrent to a safe value & duration
Protective earthing conductors should be able to carry an earth fault current provided that....
They don't reach excessive temperatures
An electrical installation must provide reasonable safety from the following...
Electric Shock
Physical Hazards
Fire
Every motor should be provided with a switching device capable of performing the following function
Motor isolation
An electrical installation must be designed to protect against external factors by providing...
Protection against mechanical damage
Fault protection is required to protect a person from electric shock when they have come into indirect contact
True
Every item shall be selected and installed to ensure compliance in accordance with...
Earth Leakage Current
Frequency
Voltage Rating
Design Current
All live parts of a separated circuit shall be electrically...
Separated from all other circuits
(Including other separated circuits and earth)
Voltage appearing between simultaneously accessible parts is called..
Touch Voltage
Electric current that passes through a human body when that body touches one or more accessible parts of electrical equipment is called..
Touch Current
A zone extending from any point on a surface where persons usually stand or move about, to the
limits that a person can reach with the hand in any direction without assistance is the definition
for..
Arm's Reach
Readily accessible is anywhere that is capable of being reached quickly and without climbing
over or removing obstructions, or using a movable ladder, and in any case not more than how
many metres above the ground, floor or platform?
2 meters
This device or piece of equipment is used to connect the electrical installation earthing system to
the general mass of earth.
Earth Electrode
This device or piece of equipment is used to connect the earthing system within the electrical installation to the supply neutral conductor.
MEN Link
This device or piece of equipment is used to carry earth fault currents, connecting the earthing system to the portion of the electrical installation required to be earthed.
Protective Earthing Conductor
This device or piece of equipment is used to connect the main earthing terminal / connection or bar to the earth electrode or to the earthing system of the source of supply.
Main Earthing Conductor
This device or piece of equipment is used to bring exposed conductive parts or extraneous conductive parts to the same or approximately the same potential, but not intended to carry current in normal service.
Equipotential Bond
This device or piece of equipment is used to provide both neutral and protective earth functions combined in a single conductor. (The supply neutral normally performs this function)
PEN Conductor
Types of Extraneous Conductive Parts include...
Metal reinforced building components
Pool fencing
Steel Framed structure
An overload current is a fault condition
False
An short circuit current is a fault condition
True
This class of equipment uses a protective earth for accessible conductive parts as a protection measure...
Class I Equipment
This class of equipment uses double insulation as a protection measure...
Class II Equipment
This class of equipment uses extra low voltage as a protection measure..
Class III Equipment
The nominal voltages and tolerances for low voltage supply systems in Australia
230/400 V + 10% to - 6%
Electrical installations are divided into circuits to...
Avoid danger/minimise inconvenience during a fault
Ease safe operation, inspection, testing and maintenance