Page 66 - Access Catalog 10

65
REFERENCE
3-pin Australian Mains Plug
Power Supply Units Abbreviations and Symbols
The rating plate of an Extra Low Voltage Power Supply Unit. (ELVPSU) shows various symbols and abbreviations representing ratings, class, insulation, polarity and other electrical safety and EMC compliance details.
Abbreviations
The following abbreviations used in conjunction with a numeric value, are used to define nominated electrical characteristics of a power supply unit.
Use
Marking
Flex Conductor Colours
Building Wire Conductor Colours
Active A
Brown Red Green/Yellow Green/Yellow
Neutral
N
Blue
Black
Earth
E
V
Volts
Hz
Hertz
A Amperes
VA Volt Amperes W Watts
PRI Input
DC Direct Current
~ Single Phase (AC)
mA
Miliamperes
SEC
Output
VAC
Volts AC
AC
Alternating Current
Australian Mains Plug Variations – AS/NZS3112
Plug End Pinout
Socket Compatibility
10Amp Round Earth
20Amp Flat Earth
Active & Neutral Pins 6.35mm
x 1.63mm
Earth Pin
6.35mm NA x 1.63mm
Power Calculation
The following formula is used to calculate wattage (or VA). This formula is useful to determine if a required voltage and current combination will exceed the maximum capacity of a particular AC Adaptor’s case.
Volts x Amps = Watts (VA)
Power Supply Polarity Symbols
The polarity symbol on the rating plate of an AC to DC power supply indicates if the centre (or tip) of the output plug is positive (+) or negative (-). It is important to use a power supply having the correct polarity for the host device. Reverse polarity may result in malfunctioning or damaged equipment.
Centre Positive.
Indicates that the centre (tip) of the output plug is Positive (+) and the barrel of the output plug is Negative (-).
Centre Negative.
Indicates that the centre (tip) of the output plug is Negative (-) and the barrel of the output plug is Positive (+).
Other Symbols
These symbols are used to define the type of construction and safety and/or fail-safe characteristics of a power supply unit.
10A 2 Pins
10A 3 Pins
10A 3 Pins (Round Earth)
15A 3 Pins
20A 3 Pins
Description
Standard 10A mains plug for double insulated appliances
Standard 10A mains plug
10A mains plug with round earth pin
Standard 15A mains plug
Standard 20A mains plug
10Amp Flat Earth
15Amp Flat Earth
Applications
Double insulated domestic appliances and equipment.
Earthed domestic appliances and equipment.
Special purpose outlets such as control circuits, lighting and exhaust fans etc.
Caravans, air conditioning, light industrial appliances and equipment.
Plug-in stoves air conditioning and light industrial appliances and equipment.
Direct current
Isolating transformer transformer
Fuse-link
Protective earth Class II construction
Safety isolating transformer Fail-safe
Frame or core terminal
Non-short-circuit transformer. Has an associated external protective device.
Short-circuit-proof transformer. There are two types. An inherent type is short-circuit proof provided that the temperature rise does not exceed the specified limit. A non-inherent type is equipped with an external protective device.
Fail-safe transformer. The non-short-circuit-proof transformer symbol or the short-circuit-proof transformer symbol can be combined with either an isolating transformer symbol or with a safety isolating transformer symbol to produce a composite symbol. In this example, the short- circuit-proof symbol is used in conjunction with the safety isolating transformer symbol.
9.08mm x 1.63mm
9.08mm x 1.63mm
NA
REFERENCE