Damp areas
What does the term IP rating mean in relation to electrical fittings?
International protection
What is a switch or outlet that is supported by a hanging cable called?
Pendant
Explain what a catenary wire is?
A catenary system is a wire between two points attached to hooks or eyelets and tensioned by turnbuckles to suspend cables across a distance
Explain an inductor
An electronic component that stores energy in an magnetic field, a coil or loop of wire
What are the two steps you should take before soldering?
Clean the tip
Tin the tip - a small amount of solder covering the tip
What section of AS/NZS 3000:2007 is damp situations?
Section 6
Name an additional colour conduit that other services use
Green - Telecom
Blue - Water
Yellow - Gas
What are three things to avoid when running cables?
Friction burns to cables
Kinks, tangles & twists
Cables getting squashed
An LED has two legs, what are they called?
DOUBLE POINTS!!
If you can identify them both
Anode & cathode
Anode has the longer lead than the cathode
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What is the ideal temperature to solder at?
250oC - 270oC
What does the second number in an IP rated fitting mean?
Protection against water
DOUBLE POINTS!!
When installing a cable, what is the allowable volt drop?
What is the calculation?
Vd = 230 x 2.5 = 5.75v
100
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Name three types of cable installation that will affect the current carrying capacity of the cable?
Fully surrounded by thermal insulation
Partially surrounded by thermal insulation
Buried - depending on soil temperature
To prevent electrostatic damage to electronics, what can be used?
Electrostatic wrist band
Anti static mat
What is the appropriate PPE when soldering?
Eye protection
Correct clothing (cotton)
How many zones does a bathroom with a shower have?
Four
Zone 0, 1, 2 & 3
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Name at least two different types of cable management systems
(How to support cables in long runs)
Ladder
Tray
Trunking
Caternary wire
Unenclosed sheathed cables buried direct, need how many indicators for their location?
1 x Marker tape
2 x Permanent cable marker signs
Explain what a capacitor does?
Electrical component that stores potential electrical energy
What is the two main purposes of tinning the tip of the soldering iron?
The thin layer of solder helps to transfer the heat from the tip to the component
Minimises oxidation which can block heat & contaminate the joint
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Give four examples of damp situations
Water containers - baths/showers/basins
Swimming/ paddling/ spa pools
Fountains & water features
Sauna Refrigeration rooms
Sanitisation/ hosing down operation
What is the equation for a single phase volt drop calculation?
Vd = L x I x mV/A/m (x 1.155)
1000
Vd = L x I x Vc (x 1.155)
1000
In what section of AS/NZS3000:2007 would you find installation of cables?
Section 3.9
What are three factors that affect the capacitance of a capacitor?
Area of the plates
Dielectric type
Distance between the plates
How many checks do you have to do before you start soldering?
Four
Check the handle, tip, cord and vacuum (if available)