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Amp meter / shunt
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Liteace:
Hello ALL. need a bit of advise, Ive, on the way to me an old server P.S it has 3 or 4 30 amp outputs that can be all joined together to produce about 100ish amps, I would like to if at all poss use an amp meter with shunt but how would I wire this up ?

Thanks
rstofer:
For industrial applications, we use what are called '50 mV shunts'.  For example, a 100A 50 mV shunt drops 50 mV when 100A flows.  This is measured on a meter.

https://www.amazon.com/Shunt-Portable-Out-0-50-0-100/dp/B01M0JJZI1
chuckb:
I had worked with 50 mV shunts for 20 years until I came across this installation restriction.

There is guidance from shunt manufacturers that a shunt should not be run continuously above 66% current. We tested that guidance with a 400 amp 50mV shunt connected to 1" wide bus bars and passing full current. It reached well over 100 deg C and was discolored when were were finished. I'm sure the calibration of the manganin shunt was changed.

If you have a 100 amp load I would use a 150 amp 50mV shunt.

I found two links with this guidance -
https://www.bluesea.com/products/9230/Analog_Meter_Shunt_-_100A
https://www.rammeter.com/media/bulletins/RamMeterInc_ShuntDiscussion1.pdf  page 2
rstofer:
As with most things in the electrical business, we need to derate.  Operating a shunt at 66% makes all the sense in the world.
Liteace:
This amp meter has not got to be 101% accurate, it will be glanced at every now and again to see what load is on the power supply, the power supply can deliver 130 amp and there's no way I'll be supping all of those, Ive also looked at these

 https://www.google.es/imgres?imgurl=https%3A%2F%2Fi.ebayimg.com%2F00%2Fs%2FMTIwMFgxMjAw%2Fz%2FgGMAAOSwAvJXB2jH%2F%24_35.JPG%3Fset_id%3D880000500F&imgrefurl=https%3A%2F%2Fwww.ebay.com%2Fbhp%2Fac-ammeter&docid=ydOSyWtX60LaDM&tbnid=ZPebVklv4fNWPM%3A&vet=10ahUKEwjiz7T454TfAhWYSxUIHa3fCDAQMwitASgwMDA..i&w=300&h=300&bih=882&biw=1280&q=amp%20clamp%20digital%20panel%20%20meter&ved=0ahUKEwjiz7T454TfAhWYSxUIHa3fCDAQMwitASgwMDA&iact=mrc&uact=8

something like that for DC voltage, what'd think ?

Thanks
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