RCCBs
What you need to know
RCD Solution
Types of
RCCBs
Type AC
General purpose use
Type AC is now non-compliant with AS/NZS 3000 and is illegal to use in electrical installations
Type A
Equipment incorporating electronic components
RCCB can detect and respond as for type AC, PLUS pulsating DC components.
Type F
Equipment with frequency inverters
RCCB can detect and respond as for Type A, PLUS mixed frequency residual current.
Type B
RCCB can detect and respond for Type F, PLUS smooth DC residual current.
Types of
RCDs
Photovoltaic Installations
Photovoltaic cells are becoming increasingly popular with end users. During connection of the solar inverter to the switchboard, the cable layout will dictate the protection requirement. When installed behind the building surface, Type A RCDs with switched neutral are suitable to substitute the mechanical protection of the cable.
Home care and medical applications
Due to the critical nature of medical installations, RCDs with high sensitivity and fast trip times are required (Type I). Home care medical installations now must also comply with the same installation rules as for patient areas (AS/NZS 3003).
Guidance on the safe use of electricity in patient care is given in AS/NZS 2500.
Home appliances
Type A RCDs are adequate for protecting circuits with whitegoods such as air conditioners. However, with newer inverter driven motors and compressors in appliances, there is a possibility of having mixed frequency leakage currents. In this scenario, a Type F RCD maybe used to increase the safety of the installation.
Electrical vehicle charging stations
With increased adoption of electric vehicles, choosing the right protection for charging systems is required. Each connecting point should be protected by its own switched neutral RCD of at least Type A (30mA).
Where the EVCS is equipped with a socket outlet or vehicle connector, protective measures against DC fault current should be taken. In some cases, a Type B RCD maybe required.
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RCD
Examples of type of equipment / load
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Type AC
Resistive, Capacitive, inductive loads generally without any electronic components, typically:
- Oven/Hob with resistive heating elements (no electronic clock/timer etc.)
- Class II consumers: Hair dryer, etc.
- Lights: Incandescent, Tungsten & halogen lighting
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Type A
Leads with electronic components, typically:
- Class I appliances: IT and Multimedia equipment, washing machines
- Single phase Solar Inverter where any smooth DC fault current is less than 6mA
- Electrical vehicle (EV) charging where any smooth DC fault current is less than 6mA
Type I is a special Type A, 10mA, with a tripping time less than 40ms:
- Patient area: medical equipment of Class I permanently wired or plugged in socket-outlets
We offer a comprehensive range of Type A products which includes single module RCBO (ADC9...), 4P RCBO and RCCBs.
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Type F
Frequency controlled equipment/appliances including Single phase inverters, typically:
- Some air conditioning systems featuring power inverter technology
- Some heat pump hot water systems where any smooth DC fault current is less than 10mA- Some motor driven machinery
Type F is also suitable for Type A applications. We offer 2P and 4P Type F RCCBs.
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Type B
Electronic equipment including multi-phase inverters, typically:
- Variable speed drive
- UPS
- Electrical Vehicle charging where any smooth DC fault current is greater than 6mA
- Solar inverter where any smooth DC fault current is greater than 6mA
- Industrial machines
- Cranes and lifts
Type B is also suitable for Type A and Type F applications. We offer 2P and 4P Type B RCCBs.
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