The switch in the distribution box is turned on

The main switch or individual circuit breakers (MCBs) in a distribution box control power, and the switch in the “on” position is the one currently supplying electricity to its circuit.Main SwitchThe main switch, often a double-pole MCB in single-phase systems, controls the entire electrical supply to the distribution box. When this switch is turned on, all downstream circuits receive power. It is typically the largest switch in the panel and is rated for the maximum current capacity of the installation, such as 63A in domestic setups .Individual Circuit BreakersMiniature Circuit Breakers (MCBs) protect individual circuits. Single-pole MCBs are used for standard loads like lighting and outlets, while double-pole MCBs may be used for high-power appliances. Each MCB has an on/off position: when the switch is flipped to “on,” the circuit is live; if it trips due to overload or fault, it moves to the “off” or “tripped” position .Residual Current Devices (RCCBs)RCCBs or RCDs provide protection against leakage currents and electric shocks. They do not protect against overcurrent but must be in the “on” position for the circuit to be live .How to Identify Which Switch Is OnVisual Inspection: Look for the switch toggles. The “on” position is usually marked or oriented consistently across the panel.Labeling: Many distribution boxes have labels indicating which circuit each breaker controls, helping identify which circuits are active .Testing: Use a non-contact voltage tester or multimeter to confirm if a circuit is live. In summary, the main switch must be on for any circuit to receive power, and individual MCBs or RCCBs in the “on” position indicate which circuits are currently active. Always ensure safety precautions when inspecting or operating a distribution box.