When implementing measures to control a risk, what control measure should first be implemented?
Eliminate the Hazard
Factors that effect the outcome of an electric shock on the human body include...
Amount of time
Amount of current
Current pathway
Methods to remove a victim from a low voltage electric shock where supply cannot be isolated easily.
Kick them clear with the sole of your boots
Pull them clear by any loose clothing
You should still attempt to rescue a victim suffering from a high voltage shock by pulling or pushing them clear.
False
Extra Low Voltage is completely safe.
False
What formula is used to determine the heat generated in a cable?
H = I^2 * R * t
If the current in a cable is doubled, by how much will the heat generated increase?
4 Times/Quadruple
If the current in a cable is tripled, by how much will the heat generated increase?
9 Times/Nontuple
The maximum continuous current a cable can carry without exceeding its temperature limits is called the...
Current Carrying Capacity
What will happen to the temperature of a cable if the current flowing through it increases?
The temperature will increase as the power loss in the cable increases
The designated ambient temperature for cable installations in Australia is:
40*C in air
25*C underground
What AS 3000 clause discusses recessed luminaire requirements?
Clause 4.5.2.3
What are two reasons for dividing electrical installations into circuits?
To avoid danger and inconvenience when faults occur
Ease safe operation, inspection, testing and maintenance
What aspects are to be considered when arranging an electrical installation into separate circuits?
If equipment has to operate as a group
What the load and operating characteristics of the equipment are
Ability to service, alter or add to the installation with little disruption
Ability to locate faults
The maximum demand of the sub main supplying a domestic electrical installation may be estimated by...
Using appropriate diversity factors for connected load from Table C1
Socket outlets fitted in industrial installations have differing diversity to socket outlets fitted in domestic installations due to dissimilarities in...
Daily Demand
Where can SELV and PELV systems can be used for protection?
Where circuit voltage doesn't exceed 50V a.c. or 120V d.c.
Where should SELV circuits NOT be connected to?
Earthing conductors
Exposed conductive parts of another system
Earth
Extraneous conductive parts
Other circuits
A PELV circuit has a conductor connected to Earth.
True