ASTM A672 covers B70, C70 and L70 grades. Equivalent for each of them do you need?
Several factors influence the abrasive qualities of a concrete surface. Mix design, exposure conditions, placement and finishing regimens are foremost. For instance a broom finish offers more skid resistance however it will demonstrate wear much quicker than a steel troweled finish will. Whatever these conditions are should be tested if the abrasion qualities are a real concern. ASTM C-672 Scaling resistance and ASTM C-31 Compressive Strength are the two test that are all telling as to what you can expect. Can be very important! Concrete Dusting is a problem in areas where electronics attract silica dust from abraded concrete surfaces, causing problems with the electronics. Use of a product called "StableCrete" is a way to stop dusting and improve compressive strength of a concrete. This material penetrates into a concrete and forms a solid inside the capillary system of concrete making it more dense. It also waterproofs and gives acid resistance to the concrete.
The formula you are looking for is; Amps = HP x 746/1.73 x Volts x %eff x pf. 350 x746/1.73 x 480 x .90 x .90 = 261100/672 = 389 amps. This amperage assumes that the efficiency of the motor is at 90% and the power factor of the motor is also at 90%.
20 percent of 672 = 134.420% of 672= 20% * 672= 20%/100% * 672= 1344/10= 672/5 or 134.4
83% of 672 = 83% * 672 = 0.83 * 672 = 557.76
4% of 672 = 4% * 672 = 0.04 * 672 = 26.88
1 x 672 = 672 2 x 336 =672 3 x 224 = 672 4 x 168 = 672 6 x 112 = 672 7 x 96 = 672 8 x 84 = 672 12 x 56 = 672 14 x 48 = 672 16 x 42 = 672 21 x 32 = 672 24 x 28 = 672
672
ar 672-20
5/6 of 672 = 672*5/6 = 560
672-24b = 648
672 is written as DCLXXII in Roman numerals.
T3
The LCM of 60, 84 and 672 is 3360. The LCM of 6084 and 672 is 340704.
672 + 1 = 673