I'm just adding this for knowledge. As per the definition MCBs are for the equipment protection and the RCCBs are for the human protection and that's true and solid and crystal clear. But in the case that you have demonstrated, you have used and electrical bulb which is an appliance in order to demonstrate human role. But not like in appliances, human resistance comes to drop when a voltage was applied. So let's take your case. In a healthy wiring, trip will go off when an earth fault current passes for 30ms as it senses the imbalance current and that the normal scenario. But in a case like trip is malfunctioning, then this scenario gets slightly deviated from the normal case. As the trip is malfunctioning, the fault current may get the chance to pass for a long time. In this case, lets assume that the MCB is 5A rated. As the trip is not working properly, the earth fault current is having the chance to pass for a while than tripping time of the trip. If this time exceeds the tripping time of the MCB and its rated value, the the MCB triggers and makes the circuit open. In most cases where trip switches doesn't function properly, the MCBs go off because when a human is subject to a earth fault, the human acts as a conductor with varying (decreasing) resistance for a moment and the body resistance depends on the place where the contact happen. That allows the fault generally to pass a current with high magnitude and once it exceeds the MCBs rated value for a time more than rated triggering time, then the MCB will go off. You can practically test it by just direct earthing the live conductor with deliberately disabled RCCB (Please proceed with extreme caution as it is very dangerous and its better not to practice). What I wanted to high light was MCBs also will triggered in earth faults but only in a very specific conditions (Exceptional cases) like the system is equipped with disabled RCCB and the earth fault current exceeds the rated value of the MCB. But what is more important is what you are emphasizing which that to NEVER to rely on the MCBs in case of human protection as the MCBs will only trigger once there rated current is exceeded for a certain amount of time. The minimum rated current of MCBs are more than enough to make fatal accidents (Very likely death) to humans when subjected to a electrical shock for a very very less amount of time. Yours videos are really awesome and the demonstrations are great too. I Just wanted to add this for additional knowledge.Please be kind to correct me if I have misinterpreted the scenario.I wish you good luck.
@tricaltricks6319
3 жыл бұрын
Most of people are actually didnt know about the diffrenence between RCCB & the MCB.some times they thinks MCB's also suddenly trip when human get electrical shock.. I want to show them the diffrenence.. Thats it.. Thank you for the comment.. The very 1st longest comment 😁😁thankyou again 👊👊👊
@saliyapathirana3152
3 жыл бұрын
@@tricaltricks6319 Yep ... I understood your intention and its really nice to explain the phenomenons in such a simple manner that many could understand. Yep . . I made that long comment because your video is worth commenting and deserves to be emphasized such special occasions as you are willing share your knowledge among the world with dedication. . . Please keep up the good work . . Best of luck . . 👊👊👊👊👊
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