J.P.
Senior Member
- Location
- United States
7/16 wrench fits NEMA standard devices, the 11MM fits IEC standard devices, they are not interchangeable:happyyes:I'ma waitin' to hear from folks with some 'real life' fusing current measurements on an 11 mm wrench.
Only have direct experience with 7/16" wrenches <G>
Them there 11 mm wrenches don't quite fit mosta my USA type bolts, don't quite fit over the head - maybe that why they get used for fuses ?
It's because at 50Hz, the melting point of a 7/16 wrench might be higher than that of an 11mm wrench.7/16 wrench fits NEMA standard devices, the 11MM fits IEC standard devices, they are not interchangeable:happyyes:
Where is the coinage that says "in God We Trust". I always thought that was the "ur-fuse substitute".
Prior to 1982, pennies were 95% copper, 5% zinc (tin was removed in 1962). In 1982 they switched to 97.5% zinc, 2.5% copper, essentially copper plated zinc.many don't trust God anymore, and the coins have less copper then they used to as well so their fuse rating has changed
Prior to 1982, pennies were 95% copper, 5% zinc (tin was removed in 1962). In 1982 they switched to 97.5% zinc, 2.5% copper, essentially copper plated zinc.
Zinc is only 27% of the conductivity of copper, so that means higher resistance, which means at the same amount of current through it, more watts lost and higher heat, but melts at a temperature 70% lower than copper. That means you can't put even a small fraction of the amount of current through a new penny fuse as our fathers could with an old penny fuse. That probably explains why it is no longer on the chart...
Work is a tad slow today and I'm at home nursing a sprained knee...
But when you go over 60 amps the ends of fuses typically are blade type instead of round, and I don't think any of those are long enough to fit 60 amp 600 volt fuseholders either:ashamed1:I believe that customers should always get a audible & visual indication anytime a fuse blows:
This set will cover any application, from residential to industrial.
You had to go rain on my parade. I was just starting to work on a discussion of the advantages of belt-fed versus magazine-fed fuses.But when you go over 60 amps the ends of fuses typically are blade type instead of round, and I don't think any of those are long enough to fit 60 amp 600 volt fuseholders either:ashamed1:
You had to go rain on my parade. I was just starting to work on a discussion of the advantages of belt-fed versus magazine-fed fuses.
Prior to 1982, pennies were 95% copper, 5% zinc (tin was removed in 1962). In 1982 they switched to 97.5% zinc, 2.5% copper, essentially copper plated zinc.
Zinc is only 27% of the conductivity of copper, so that means higher resistance, which means at the same amount of current through it, more watts lost and higher heat, but melts at a temperature 70% lower than copper. That means you can't put even a small fraction of the amount of current through a new penny fuse as our fathers could with an old penny fuse. That probably explains why it is no longer on the chart...
Work is a tad slow today and I'm at home nursing a sprained knee...