Building Electrical Installation Tutorial

#Building Electrical Ation Tutorial Series Or In

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For clarity the bench non-earthed, isolated socket GPO's have been changed to red plastic single socket-outlets and should not be used unless specifically instructed to do so during a laboratory.Below is an example of the correct method of measurement using an oscilloscope powered from a non-earthed, isolated GPO. Most GPO's will supply 10Amps so when extending a circuit using a power board with multiple sockets, a board with over current protection should be used.The Electrical Laboratories have both Earthed GPO's as discussed in the MEN documentation which are protected by residual current devices and non-earthed, isolated GPO's which are normally not used in our labs. These plugs connect most electrical equipment to a socket-outlet or General Purpose Outlet (GPO) mounted in a wall. If a person comes into contact with both the Active and Neutral conductors while handling faulty plugs or appliances causing electric current to flow through the person's body, this contact will not be detected by the RCD unless there is also a current flow to earth.On a circuit protected by an RCD, if a fault causes electricity to flow from the Active conductor to earth through a person's body, the RCD will automatically disconnect the electricity supply, avoiding the risk of a potentially fatal shock.This MEN information above shows why the Australian electrical distribution system uses a three pin plug. external parts of an appliance that have become 'live' because of an internal fault.Contact with earth occurs through normal body contact with the ground or earthed metal parts.An RCD will significantly reduce the risk of electric shock, however, an RCD will not protect against all instances of electric shock.

Building Electrical Ation Tutorial Series Or In

The variable supplies may be configured to operate independently (as two variable supplies), in series or in parallel.The following is a simplified drawing of the Topward power supply above just showing the dual floating supplies. This supply has two floating (with respect to earth ) variable, current limited supplies and one fixed 5V/5A supply. See example below.The Topward power supply shown above is a standard example of power supplies used in our laboratories. Do not use these non-earthed, isolated GPO's unless instructed.Only GPO's mounted on benches should be used in the laboratories as these are the only ones protected by residual current devices.No wall mounted GPO's should be used in the Electrical laboratories as these outlets are for use by the cleaners and generally do not have RCD protection.All equipment used in the electrical Laboratories must have a valid Test Tag otherwise it should not be used. Touching the chassis could result in electrocution. Note the ref1 connection may cause the chassis of the oscilloscope to rise to a potentially lethal voltage.

The terminals 'B' & 'E' are not part of the floating supplies 'A-C ' or 'D-F' but may be used to reference them to mains earth if required.If a connection was made between 'CD' it would be possible to obtain the following supplies. The earth pin of the mains plug connects to the chassis of the power supply (as a 'Safety Earth') and also to the terminals marked 'B' and 'E'.

Building Electrical Installation Tutorial