Sometimes breakers are just slowly cooking
Yeah if you are just under and there is a small voltage drop say 120 to 110 or 240 to 210 breakers pop.
and when they pop, they are dead...forever, toasted.
my personal solution is increase the breaker amp capacity.
for example, if you are maxed out and breaker keeps popping at 80A increase it to 100A,
only do this if you know what you are doing, just don't add more load just because it is "not popping anymore"
my solution is not in the electrical code, codes are there to guide and make things as fool proof as possible. just think about a breaker, it is just a switch (contact points connect and disconnect--> this is the weak point), there is no way it can match the electrical capacity of a solid (no connect and disconnect) wire,
good high quality more expensive wires will perform. I have not tested all the breakers and brands but this is from experience.
BTW LOL at ETH mining profits, the 3080's are starting to look cheap hehehehe
well I was just thinking this.
wait i'm not done yet hehe..
----snip----
12A for each extension wires x 8 = 96A, you'll never reach 2500w load for extension wires, why? they have breakers and fuses too (if this fail solder a solid copper) besides two (3x gpus to 4xgpu 3080 rigs) will never reach 2500w. example: 300w per card x 8 = 2400w... my favorite x3 card is 1800w only (I used 300w per card means i added the whole system to make things easier to digest/understand)........this also means you are not going to reach 96A for wire and 100A for main breaker, this also means that 80A breaker will slowly cook and pop from time to time, same thing with those 20A breakers.
300w per card analogy means you can also setup dense gpu rigs, 3080 or 3090 top of the line power hogs hehe
the key is outlet management.
maxing out wires means you are taking responsibility off from the breakers to you, just like you login in an operating system as "admin". so
"know your wires"my drawing is simply the "essence" people can figure out their own wiring scenario from this basic guide/principle.
what i mean by 80A to 100A and 20A to 30A is replacing 80 by 100 and 20 by 30 to max out the wire and not have the trouble of popping and toasting breakers.
electrical code says #4 is 70A and #12 is 20A breaker, LOL of course low quality wires will only do as low as 65A-70A, that's why like i said, it is to make things as fool proof as possible.
good quality #4 wire can do 95A.....same thing with the #12 do not do this don't use a high quality #4 and hope it can handle 80 amps on a 100 secondary box.
and don't use 12 gauge on 30 amp breakers. even if it is high quality.this is not code in usa so I have to warn you.codes would be #2 for the 100 amp breaker sub box and 10gauge for 30 amp outlets
I ran a #6 from my main breaker to a 2 circuit sub panel and 10 gauge to 2 outlets.
I used a 50 amp 240 volt breaker in the main box to a pair of 30 amp breakers in the sub panel.
Lastly I attached some high quality 20 mp voltage regulator to each circuit .
so 50 amp to 2x 30 amp to 2x 20 amp
yeah it limits my garage to 32amp of 240 on spilt on 2 protected circuits but I am okay with this.
My garage gets really fucking hot if I run 30amp x 240 = 7200 watts of power 24/7/365 unless it is 40f or lower
what I mean by "can do" is "wire rating" not "continuous load", thanks for pointing that out, it can be misleading.
I forgot it was a 70A breaker to 100A change...the breaker was in storage for years so if forgot hehe
https://www.cerrowire.com/products/resources/tables-calculators/ampacity-charts/see the link there is a 65A to 95A types for #4 wire and 20A to 30A for #12
no worries load will only have 65A-70A max for continuous load.
notice the standard consumer/end user outlet of 15A? and the off the shelves/commodity extension cords with 2500w rating (12A at around 220V)?....that is 80% max load at 20% allowance.
even the extension cords should be used at max load of 1800w - 2000w max for continuous load, 2500w is also just a "rating". notice at 8 outlets of 9.5A load each is 76A (2000w load at 210v-->worse case scenario of voltage drop)...at 1800w per outlet you are safe.
two gpu rigs with 1300w PSU each at around 50% load for maximum efficiency, that's only 1300watts for two rigs, if you run at less efficient then you can pull up to 700watts more for both rigs (1800w-2000w max load for extension cords).
same thing applies at the 95A wire at 80% load is 76A, so 70A is safe
but then some people think they know what they are doing even if they do not...so if people start asking me questions, the answer: "follow the electrical codes!" LOL