Fuse blowing every couple of months

[deskless]

I have one rig which keeps blowing fuse every other month. Load is around 1550 wattage(12.5A). I am using 20A socket. Two PSU together 1850 is being used in the rig. 10 cards of mixed 570 and 580.

Any suggestions?

[vmozara]

Is the fuse blowing when the rig starts (for example, after power outage) or in normal use?

What kind of fuse you have, is it automatic circuit breaker or old type one-time-use fuse?

[deskless]

Is the fuse blowing when the rig starts (for example, after power outage) or in normal use?

What kind of fuse you have, is it automatic circuit breaker or old type one-time-use fuse?

It is happening while rig is on for several days. The fuse is old style one time use.

[ZombieWorm]

Can you plug into a different 20a socket and see? There may be a flaw somewhere in your loop/spur and its warming up over time - doesn't sound great.

[gt_addict]

Is the fuse blowing when the rig starts (for example, after power outage) or in normal use?

What kind of fuse you have, is it automatic circuit breaker or old type one-time-use fuse?

It is happening while rig is on for several days. The fuse is old style one time use.

have you checked logs or anything to see if a mining program is restarting causing a power surge on warmed up household cables?

[deskless]

Is the fuse blowing when the rig starts (for example, after power outage) or in normal use?

What kind of fuse you have, is it automatic circuit breaker or old type one-time-use fuse?

It is happening while rig is on for several days. The fuse is old style one time use.

have you checked logs or anything to see if a mining program is restarting causing a power surge on warmed up household cables?

Good point.
I will also bring down load by 2A to see if that stays good

[igotek]

use a good fuse Legrand and Siemens are the best

[vmozara]

It is happening while rig is on for several days. The fuse is old style one time use.

There are several reasons what could be:

1. Your fuse is bad quality, or it is wrong rating
2. There was a power outage, or several power outages at short time. Current surge at both PSU powerups exceed the current rating and blows the fuse.
3. Load is more than what you think
4. Your PSU is going bad.

For point 1. It is possible your fuses are bad rating. Verify that it really is 20A fuse.
For point 2. When you power on the PSUs, especially 2 of them at the same time, there is massive current surge (2-5x more than rated) for very short period of time. In my opinion this is the most likely reason for your issues, that there was outage of power and then it blew up. Check if your fuse has a SNAIL marking on it (slow-blowing fuse, or delayed action fuse, what ever is the name, there will be a snail or letter T (timed) or letter L (lag) next to 20A rating)
3. Maybe your rigs lose some power optimizations after some time and run the cards overvolted. Very unlikely considering you would need more than 2.2KW of load to blow the fuse.
4. Very unlikely considering you experience this every few months

[nc50lc]

It is happening while rig is on for several days. The fuse is old style one time use.

Have you checked the wiring for faulty connections and ratings? (ex. 12gauge+ wires for 20A) The most obvious signs are thin-looking wires in the circuit or bunch of "rat-tail" connections; if there's a problem, the wire or the connections will heat up and will "pop" your fuse.
If you're not qualified to do so, call for a professional electrician to do the job.

There's no other reasons for this other than faulty wiring since it's happening too often to be caused by a bad fuse, otherwise, frequent power outage.

[shiming]

Depending on your load, the size of the fuse used is no problem. If the fuse is always burned, it may be a problem with the fuse quality, or the circuit cable is aging, the temperature rises, and the current will increase. You need to check the line.

[deskless]

It is happening while rig is on for several days. The fuse is old style one time use.

Have you checked the wiring for faulty connections and ratings? (ex. 12gauge+ wires for 20A) The most obvious signs are thin-looking wires in the circuit or bunch of "rat-tail" connections; if there's a problem, the wire or the connections will heat up and will "pop" your fuse.
If you're not qualified to do so, call for a professional electrician to do the job.

There's no other reasons for this other than faulty wiring since it's happening too often to be caused by a bad fuse, otherwise, frequent power outage.

I am not expert in it. However how can a lower quality wire burn the fuse. Every time I noticed that fuse was burned badly. Why the "wire or the connection will heat up" will cause "pop the fuse". Can you please explain?
Thanks a lot for your help.

[nc50lc]

-snip-

Low quality or even wrong type of wires and connections can have a lot of resistance mainly because of the current that flows in it had exceeded the limit.
When it happens, the wires will heat up and will cause the fuse to break because it is designed to "pop" before a circuit overload happens.

Since you're not an expert and there's certainly a problem, I suggest you to seek a professional to check-up your wiring.

[Chicky213]

The fuse you are using might not be capable of taking so much power. Change it and get a better quality fuse. The kind of wiring done can be another factor causing the fuse burn. Change the fuse first, then if the problem persists, you can check the wiring and circuit connections. Once you do this I believe there will be a difference.

[joseph32]

One more tip. Check the temperature of your fuses. If they are hot, just use a fan to blow fresh air to them. Helps alot.

Got the same problem with constantly turning off fuses. Since I cool them, I never had any trouble again.

[TheHas]

I noticed that when I had multiple appliances on (heater, oven, computer, mining rig, tv etc) then the fuse would sometimes trip.

My guess is that your system is overloaded. Does it happen at the same time? For example, in the afternoon when you're home using appliances? That would be a pretty good indicator.

I live in an apartment, so the bad/cheap fuse situation is probably common for your typical inner city apartment. If you rent, you could get your landlord to arrange an electrician to come check it out - that's what I did, they replaced it and now everything is working fine.

[VasilyS]

It is normal for electrical chains. You have to have double reserve of the power. When electrical equipment is switching on there appear impulse electricity for few ms. It is the reason of blowing of your fuse.

[EdvinZ]

As correctly noted above, you can install a better fuse. If the problem remains after this, then you will not be able to do without a professional electrician who will strengthen your electrical wiring. Electricity is an area where strict professionalism is needed.

[dentolas]

Well, my impression is that maybe you have the wrong wiring behind that 20A socket. If I'm not mistaken, for 20A in one phase you need at least 4mm wire.
2,5mm2 wire should be used to máx 16A but some people like to play with theoretical values and use it to 20A, causing excessive heating on the wiring...
It is still strange because the fuse should break by excess power, not wiring temp... but worth checking

[naska21]

I have one rig which keeps blowing fuse every other month. Load is around 1550 wattage(12.5A). I am using 20A socket. Two PSU together 1850 is being used in the rig. 10 cards of mixed 570 and 580.

Any suggestions?

The problem may be that you are using two PSU. Even exactly the same type PSUs have  slightly different internal resistance , resulting in their incresing  distort (caused by temperature) and the current increase in the power supply circuit. Practice taught me to always use the single PSU for rig.

[deskless]

I have one rig which keeps blowing fuse every other month. Load is around 1550 wattage(12.5A). I am using 20A socket. Two PSU together 1850 is being used in the rig. 10 cards of mixed 570 and 580.

Any suggestions?

The problem may be that you are using two PSU. Even exactly the same type PSUs have  slightly different internal resistance , resulting in their incresing  distort (caused by temperature) and the current increase in the power supply circuit. Practice taught me to always use the single PSU for rig.

Slowly moving to a single PSU rig. When I started I went for 850W PSU and therefore had to double them in a rig. Currently, I am planning to just lower usage to below 10A for the socket and see if that helps.