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From the KD-10 manual.. "The 90-degree setting is approached for all ranges when R3 resistor is open circuited for the 3φ unit or R2A and R2C for the phase-to-phase unit." http://www05.abb.com/global/scot/scot229.nsf/veritydisplay/70e116ce4291fea5c1256ed9003585a3/$file/41-490-j.pdf

So should I be looking to ask a Geotech engineer if the soil will support the footings and the added weight of the rocks? I think my soil is mostly sand which is part of my problem with water, as there is not much in the way to slow down water.

Ron, i guess one thing i was thinking about was to jackhammer the old slab away from the footings so when the added weight is on the floor the floor could settle and not take the footings with it. Although there will be some additional weight on the footings it shouldn't be as much. Anybody have...

Please believe me that there is no other remedy to my constant pumping water woes than to raise my basement floor. That is why I'm at a structural engineering board and not a civil engineering forum. I've had the country drain commissioner/engineer another local civil engineer and both have told...

Typically the classic short circuit model doesn't include the copper losses. This is usually ok because the parallel line and fault impedance are significantly smaller than than the transformer model. Basically the positive and negative sequence models assumes infinite impedance on the sides of...

I've only set a few KD relays, but boss has probably issued 2000 Kd-4 and KD-10 settings. I might have some notes that might help I'll look for some next week.

I’m in Michigan so it does get cold, but I don’t think frost will make it to the water table. Based on previous nightmares I don’t want to go into I believe the water will go up to about 20-25 inches. This gives 60” for frost and I believe the Michigan frost lines to be about 42”. I plan on...

Sorry, if this is a dumb question I’m an EE on the wrong board… but will concrete blocks last underwater? After much review I’ve decided I need to fill in my basement with 3ft of pea gravel and make it a 5ft crawl space. It is just too far below the water table and I cannot pay the electricity...