We will study how the electricity comes to your house, offices and factories, starting from nearby service pole. Generally, the houses, offices and shops, etc., are connected with single-phase supply, if the total connected load is less than 5 kilowatt. If the load is more than 5 kilowatt, the three-phase four-wiresystem is recommended. In factories and plants, we need to connect lighting as well as three phase induction motors, hence three-phase four-wire system is used.
i. Domestic wiring diagram
A four-core weatherproof, 660 volts, aluminium cable is used to connect the three phase four wires (Three phase and a neutral wire) energy meter, from the service pole. This cable is supported by an 8 S.W.G. galvanised steel wire, from service pole to consumer premises
G.I. pipe is used to enclose the service cable. This pipe is fixed on the wall, with the help of saddles, gutties and wooden screws and it should be so selected that the weatherproof cable is easily pulled into the pipe without damage to the insulation of the cable. The service cable is made to enter the building through the pipe and connects the main board for connecting the three-phase energy meter. The output of the energy meter is controlled through the I.C.T.P. main switch. The phase wires are connected the fuse links whereas the neutral wire is directly connected to the neutral link. The output of this I.C.T.P. main switch (one phase and neutral) is distributed through the single-phase I.C.D.P. main switches, which acts as main control switch for a room or for a power point.
ii. Factory wiring diagram
The wiring diagram for a factory or for a dairy plant is almost similar to three-phase four wire domestic wiring diagram, up-to I.C.T.P. main switch. The only difference is the output of this I.C.T.P. main switch is connected to different small capacity I.C.T.P. main switches . Similar to the previous case, a four-core weatherproof, 660 volts, aluminium cable is used to connect the three-phase four wires (Three phase and a neutral wire) energy meter, from the service pole. The size of this cable depends upon the load of the entire factory. An 8 S.W.G. galvanised steel wire, from service pole to consumer premises supports this cable. G.I. pipe is used to enclose the service cable. This pipe fixed on the wall, with the help of saddles, gutties and wooden screws and it should be so selected that the weatherproof cable is easily pulled into the pipe without damage to the insulation of the cable. The service cable is made to enter the building through the pipe and connects the main board for energizing the three-phase energy meter. The output of energy meter is controlled through the I.C.T.P. main switch. The phase wires are connected to the fuse links whereas the neutral wire is directly connected to the neutral link. The output of this I.C.T.P. main switch (Three phase and neutral) is distributed through small capacity I.C.T.P. main switches, which acts as main control switch for a section
i. Domestic wiring diagram
A four-core weatherproof, 660 volts, aluminium cable is used to connect the three phase four wires (Three phase and a neutral wire) energy meter, from the service pole. This cable is supported by an 8 S.W.G. galvanised steel wire, from service pole to consumer premises
G.I. pipe is used to enclose the service cable. This pipe is fixed on the wall, with the help of saddles, gutties and wooden screws and it should be so selected that the weatherproof cable is easily pulled into the pipe without damage to the insulation of the cable. The service cable is made to enter the building through the pipe and connects the main board for connecting the three-phase energy meter. The output of the energy meter is controlled through the I.C.T.P. main switch. The phase wires are connected the fuse links whereas the neutral wire is directly connected to the neutral link. The output of this I.C.T.P. main switch (one phase and neutral) is distributed through the single-phase I.C.D.P. main switches, which acts as main control switch for a room or for a power point.
ii. Factory wiring diagram
The wiring diagram for a factory or for a dairy plant is almost similar to three-phase four wire domestic wiring diagram, up-to I.C.T.P. main switch. The only difference is the output of this I.C.T.P. main switch is connected to different small capacity I.C.T.P. main switches . Similar to the previous case, a four-core weatherproof, 660 volts, aluminium cable is used to connect the three-phase four wires (Three phase and a neutral wire) energy meter, from the service pole. The size of this cable depends upon the load of the entire factory. An 8 S.W.G. galvanised steel wire, from service pole to consumer premises supports this cable. G.I. pipe is used to enclose the service cable. This pipe fixed on the wall, with the help of saddles, gutties and wooden screws and it should be so selected that the weatherproof cable is easily pulled into the pipe without damage to the insulation of the cable. The service cable is made to enter the building through the pipe and connects the main board for energizing the three-phase energy meter. The output of energy meter is controlled through the I.C.T.P. main switch. The phase wires are connected to the fuse links whereas the neutral wire is directly connected to the neutral link. The output of this I.C.T.P. main switch (Three phase and neutral) is distributed through small capacity I.C.T.P. main switches, which acts as main control switch for a section
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