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Hello there! Apologies for the interruption! Mccb 75a
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(Part 1 covered the components of BESCOM bill, tariff structure and sanction loads. Part 2 delves into electrical system maintenance)
With the adoption of electric vehicles, owners are tapping into their existing meters to charge their vehicles, leading to electrical mishaps. If you need to connect a 3.3 kw/7.2kw EV charger, your sanctioned load needs to be enhanced. This leads to cable/wire, MCB (miniature circuit breaker) and RCCB (residual current circuit breaker) replacement, possibly the energy meter too may need to be replaced.
Overall, if every household enhances sanction load, this leads to constant tripping of the transformer and short circuits in the electrical panel room, etc.
1. Electrical DB (distribution board): Also known as electric panel/fuse box is a component of an electricity supply system that divides an electrical power feed into subsidiary circuits while providing a protective fuse or circuit breaker for each circuit in a common enclosure. It comprises of:
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As per Standards, the RCCB/MCB should be rated for max 80% loading. Hence, for 13.05 Amps as 80%, we need a RCCB/MCB of 16.31 Amps. The nearest RCCB/MCB is 16 Amps, which is on a lower side and so, the next available rating i.e., 25 Amps is installed.
In summary, the 25 Amps RCCB/MCB is chosen to ensure adequate protection for the given load.
Why and when does your RCCB trip: RCCBs provide critical benefits in electrical systems. They swiftly (in milli-seconds) disconnect circuits in the presence of residual currents, preventing electric shocks and enhancing safety. RCCBs contribute to fire prevention by detecting and isolating faulty circuits. They also protect electrical equipment from damage caused by faulty currents, ensuring device longevity. Compliance with safety standards, versatility across various settings, and early detection of potential hazards are key advantages, making RCCBs essential components for electrical safety.
A 2 BHK apartment with 3 KW sanction load is provided with:
These are generally found at the entrance.
RCCB tripping problems mean trips that are not caused by normal electrical faults in the system. It usually indicates one of several underlying problems, such as:
One of the most common reasons for unexpected RCCB trips is moisture-creating resistance leaks in wiring, also called ground faults. This water intrusion happens more frequently in bathrooms, kitchens, basements, and outdoor circuits.
Why and when does your MCB trip: The primary function of a miniature circuit-breaker is to protect an installation or appliance against sustained overloading and short-circuit faults, but it will also give protection against earth faults provided that the earth fault loop impedance is low enough.
In a 2 BHK flat, there is a main 2 Pole MCB with 25A rating. This MCB is connected to:
When we draw more current (measured in amperes) through a wire than its capacity allows, the wire heats up. As a consequence, the outer insulation begins to melt, and the individual strands of the wire may fuse together. This can lead to a short circuit, which in turn can cause a fire hazard.
Read more: A guide to fire safety in hospitals How should apartments and gated communities handle transformer maintenance?
These are basic checks before adding any load and requesting for enhancement of sanction load
If everything is fine then meet your area BESCOM AE/AEE for guidance on applying for enhancement of sanction load.
While explaining the steps of rccb selection.It is mentioned that 120% of 13.05 is 10.44.But it is 15.66A.Kindly correct me if I am wrong.
Thank you Archana for pointing out the error. Pl read 10.44 Amp as 15.66 Amp.
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