redman
Just wondering if anyone else is having trouble with these fuses blowing?
Had 2 calls over weekend, generator starting up on its own and find one of the two fuses blown. I know they were 10 years old, use to change these fuses out every 5 years during maintenance even though they didn't need it, but the cost got expensive to change out fuses that were fine, and now wait for them to blow, but for some reason, they always blow in middle of night, and on weekends. Reminds me of the smoke detectors that only go off at night.
Even when I was doing them every 5 years, still had some would blow in between that time. Typically will change at lease 20 fuses a year blown.
Just wondering if anyone else is having this problem.
Quote
MEC
redman;35195 wrote:
Just wondering if anyone else is having trouble with these fuses blowing?
Had 2 calls over weekend, generator starting up on its own and find one of the two fuses blown. I know they were 10 years old, use to change these fuses out every 5 years during maintenance even though they didn't need it, but the cost got expensive to change out fuses that were fine, and now wait for them to blow, but for some reason, they always blow in middle of night, and on weekends. [B]Reminds me of the smoke detectors that only go off at night.[/B]
Even when I was doing them every 5 years, still had some would blow in between that time. Typically will change at lease 20 fuses a year blown.
Just wondering if anyone else is having this problem.


Spiders!
Quote
MEC
For the fuses I would check the conduit for water. Maybe there's a nick in the insulation?
Can you isolate and megger these?
Quote
78buckshot
I have not seen random blown N1, N2, or T1 fuses. The only time I had to trace circuits for line voltage fuses was in a Briggs & Stratton, it turned out to be the unused battery and crankcase heater circuits.
Quote
redman
Mec, agree with you on spiders. I have not meged the wires out, since most of these fuses are over 10 yrs old, and 1st time blowing, figure they came here to do what they were suppose to. We had bad storms last 12 days with rain every day, assume with all the power outages over weekend, and trees hitting power lines, that's what caused it, since it was in a specific area where power was out several times.
78buckshot, have had the briggs to blow as well, just not as much as the generacs have in the last few years.
Like I told the homeowner, who questioned why the fuse would blow, it has power on it 24 hrs a day 7 days a week for over 10 years and just decided to blow, just like a light bulb, why did it blow.
Quote
MEC
Rained most of last week here, so if you had anything like us the water would be suspect.
Quote
UPS
Fuse fatigue eventually weakens old fuses. Surges, temperature changes, etc. add up. And if a slight bit of tarnish or corrosion forms between the fuse and the holder clips, it adds to the problem.
Quote
redman
I am now going to say after 5 different generators in a 1 mile circle have blown fuses since Saturday, during power outages, and no power outage, it must have come from utility source. Typically just 1 of the 2 fuses blown, and all on old 15 kw, 43900 series generators.:confused:
Quote
MEC
Sounds like you found it.
If it was isolated to just that unit I would lean towards water being a factor.
Since there's so many it only makes sense it's a surge.

I would check with the owners to see if anything burned out, so they are aware and can contact the utility for reimbursement.
Would also be a good way for you to sell and install some SPDs.
Quote