Does installing an RCCB breaker replace electrical grounding?

Does  the use  of ground leakage protection circuit  breakers replace grounding ?

First  , what are  the ground leakage protection breakers  ?

They are  special circuit breakers  that sense the leakage current from the ground , which exceeds the dangerous current for users, and is often disconnected when it senses a current higher than  30mA .

The most famous  of these  cutters  are  :

GFCI : Ground Fault Circuit Interrupter

RCCB : Residual current circuit breaker

According to the  American code,  it must be used with some points and devices in the electrical system , such as heaters in toilets , washing machines , etc., with the presence of the basic traditional grounding system .

However  , it  is not  compulsory  with  every  electrical circuit  in electrical installations , unless the entire system does not have a grounding system at all, or it has a grounding system but the connections are very old and there is a possibility of breakdown of insulation in the cables , then it becomes mandatory .

We return  to the question  ,  do  these  circuit breakers  completely dispense  with  grounding  for homes that are not grounded ? Are you really protecting  ?

Answer  :  In  the event  that  its installation  is cheaper than  grounding the electrical system , it really makes the system safer than if there was no grounding, but it is not completely safe as if there was grounding .

. I don't  like  to use  the word  " safe "  when  it comes to  electricity . There are always situations where you can get hurt or killed no matter what is done , and you should always be aware of their dangers .

The grounding  on  the electrical outlets  came  to deal with  faults  in  the wires  and devices  that may have exposed us to electric shock  . For  example  ,  if  you have an  appliance with a bare metal chassis such as a refrigerator , and a failure causes that chassis to come into contact with its  " live/hot line "  , you could go into shock  ( or, God forbid, die )  if there is no grounding                     .

Does installing an RCCB breaker replace electrical grounding?

 But if  this circuit breaker is  grounded  , it is likely that even if the fault is less than the disconnect current , if the normal breaker does not feel it, the external part of the device will remain connected to the ground and there will be no shock when touching it .

But it will protect   GFCI  or  RCCB breakers

Installed  on  an ungrounded circuit  from dangerous shocks because it will disconnect if it comes into contact with anything directly . But if there is a fault current between the live components and the  “ neutral ”  neutral , and that value does not exceed the degree of separation of the ordinary circuit breaker , then this may cause a fire , God forbid  . Where GFCI  and  RCCB  breakers will not feel                                In  this  case  , it is  always looking  for the leakage current on the ground line , and not the current passing through the Neutral .

So it is always recommended  that people who  have  ungrounded  outlets  replace them  with GFCIs  or  RCCBs  if  they cannot afford to install new wiring with ground  . At least it will protect them, especially children, from electrocution.

Another  way  to protect  ungrounded outlets  is to replace the regular circuit breaker with an arc fault circuit interrupter  (AFCI).

Arc Fault Circuit Interrupters

 These  special circuit breakers  can detect and will sense an electrical arc whether the arc is caused by a live  line  connection to neutral or to ground .

These types of breakers  are especially useful in  homes with ungrounded outlets or old wires with worn  insulation .

However  ,   an AFCI  will not  protect if  someone  touches  a component connected to a live line,  only  a GFCI  will do that . I would still recommend  extending new ground wires to provide ground if you can afford it  .