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A stair case point is operated with:
Two two-way switches
Two one-way switches
Two intermediate switches
None of these
Two two-way switches
A staircase lighting circuit is designed to control a single lamp from two different locations, such as the bottom and top of a staircase. This is achieved using two-way switches, which have one common terminal and two outgoing terminals that allow the user to complete or break the circuit regardless of the other switch's state.
A staircase lighting circuit is designed to control a single lamp from two different locations, such as the bottom and top of a staircase. This is achieved using two-way switches, which have one common terminal and two outgoing terminals that allow the user to complete or break the circuit regardless of the other switch's state.
IloadтАЛ=RlampтАЛVsourceтАЛтАЛ тАФ current drawn by the staircase lamp
The circuit uses two SPDT (Single Pole Double Throw) switches connected in a 'traveler' configuration. When the switches are in the same state (both up or both down), the phase wire is connected to the load, turning the lamp ON. When the switches are in opposite states, the path is broken, turning the lamp OFF, allowing for independent control from either end.
A two-way switch is essentially a Single Pole Double Throw (SPDT) switch.
The two switches are connected via two 'traveler' wires.
Staircase wiring eliminates the need to backtrack to turn off a light.
Energy efficiency by allowing lights to be turned off immediately after use.
Enhanced convenience and safety in multi-level structures.
Requires more wiring compared to a standard single-switch circuit.
Increased initial installation cost due to the use of two-way switches.
Staircases in residential buildings.
Long hallways where lights need control from both ends.
Large rooms with multiple entry points.
IE Rule 30 specifies requirements for the installation of switches to ensure safety and accessibility.
Option B is incorrect because a one-way switch only has ON/OFF positions and cannot complete a logic-based circuit like the staircase connection.
Option C is incorrect because intermediate switches are used to control a lamp from three or more locations, which is unnecessary for a standard two-point staircase.
A is correct тАФ A staircase circuit uses two two-way switches to enable independent control of a single light source from two distinct positions.
Always remember that 'two-way' refers to the internal contact configuration of the switch, not the number of positions, which is technically two (plus OFF state potential).