On Wednesday, July 12, 2017 at 12:10:13 AM UTC-4, Bob F wrote:
On 7/10/2017 8:56 PM, trader_4 wrote:
On Monday, July 10, 2017 at 11:30:42 PM UTC-4, Bob F wrote:
On 7/10/2017 8:08 PM, trader_4 wrote:
On Monday, July 10, 2017 at 9:16:55 PM UTC-4, Lenny Jacobs wrote:
On 10/07/2017 23:01, trader_4 wrote:
On Monday, July 10, 2017 at 12:14:36 PM UTC-4, Lenny Jacobs wrote:

Theoretically possible but that's not the case here. Every year, when
the raining season comes and the main breaker is tripped, I can always
trace to the same sub-breakers that cause the problem and turn them
down. They are not tripped all at the same time but they are always the
same four breakers that have the problem.


How do you identify which one caused it? Does it immediately trip the
main again when you put the offending breaker on, ie the fault is
still there? If so, if it's not intermittent, I would think you'd
immediately further track down what the source of the fault is.


I flipped all sub breakers down and flipped them one by one to locate
the offending breaker. Once I found the offending breaker, I left it
down and everything would be fine. Well, except that particular circuit
that was turned off.



I studied the breaker box and found that it's not like what I usually
saw in the US. It has a 75 A main breaker labelled Ground-First FL Main
(this is a two-story building). There are two 63 A breakers labelled
Ground FL Main and another two 63 A breakers labelled First FL main.