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US-American and British units - Conversion of usual measuring units

Units for cables and wires
In the US the measurements are mainly used in AWG-numbers (AWG = American Wire Gauge). The AWG-numbers conform the British B&S-numbers (B&S = Brown & Sharp)
AWG No. Cross-section mm² Diameter mm Conductor Resistance Ohm/km AWG No. Cross-section mm² Diameter mm Conductor Resistance Ohm/km
1000 MCM* 507 25.4 0.035 14 2.08 1.63 8.79
750 380 22.0 0.047 15 1.65 1.45 11.20
600 304 19.7 0.059 16 1.31 1.29 14.70
500 254 20.7 0.07 17 1.04 1.15 17.80
400 203 18.9 0.09 18 0.8230 1.0240 23.0
350 178 17.3 0.10 19 0.6530 0.9120 28.3
300 152 16.0 0.12 20 0.5190 0.8120 34.5
250 127 14.6 0.14 21 0.4120 0.7230 44.0
4/0 107.2 11.68 0.18 22 0.3250 0.6440 54.8
3/0 85.0 10.40 0.23 23 0.2590 0.5730 70.1
2/0 67.5 9.27 0.29 24 0.2050 0.5110 89.2
0 53.4 8.25 0.37 25 0.1630 0.4550 111.0
1 42.4 7.35 0.47 26 0.1280 0.4050 146.0
2 33.6 6.54 0.57 27 0.1020 0.3610 176.0
3 26.7 5.83 0.71 28 0.0804 0.3210 232.0
4 21.2 5.19 0.91 29 0.0646 0.2860 282.0
5 16.8 4.62 1.12 30 0.0503 0.2550 350.0
6 13.3 4.11 1.44 31 0.0400 0.2270 446.0
7 10.6 3.67 1.78 32 0.0320 0.2020 578.0
8 8.366 3.26 2.36 33 0.0252 0.1800 710.0
8 6.63 2.91 2.77 34 0.0200 0.1600 899.0
10 5.26 2.59 3.64 35 0.0161 0.1430 1125.0
11 4.15 2.30 4.44 36 0.0123 0.1270 1426.0
12 3.30 2.05 5.41 37 0.0100 0.1130 1800.0
13 2.62 1.83 7.02 38 0.00795 0.1010 2255.0

4/0 is also stated: 0000; 1 mil = 0.001 inch = 0.0254 mm
* for bigger cross-section the sizes in MCM (circular mils)

39 0.00632

0.0897

 2860.0

1 CM = 1 Circ. mil. = 0.0005067 mm²
1 MCM = 1000 Circ. mils = 0.5067 mm²



General Measuring Units
Length

1 mil

= 0.0254 mm

1 in (inch)

= 25.4 mm

1 ft (foot)

= 0.3048 m

1 yd (yard)

= 0.9144 m

1 ch (chain)

= 20.1 m

1 mile (land mile)

= 1.609 km

 

 = 1760 yards

1 mile (nautic mile)

= 1.852 km

1 mm

= 0.039370 inches

1 m

= 39.370079 inches

Area

1 CM (circ. mil)

= 0.507 x 10-3 mm²
1 MCM = 0.5067 mm²

1 sq. inch (sq. inch)

= 645.16 mm²

1 sq. ft. (sq. foot)

= 0.0929 m²

1 square yard

= 0.836 m²

1 acre

= 4047 m²

1 square mile

= 2.59 km²

Density

1 cu. in. (cubic inch)

= 16.39 cm³

1 cu. ft. (cubic foot)

= 0.0283 m³

1 cu. yd. (cubic yard)

= 0.7646 m³

1 gal. (US gallon)

= 3.785 l

1 gal. (brit gallon)

= 4.546 l

1 US pint

= 0.473 l

1 US quart

= 0.949 l

1 US barrel

= 158.8 l

Temperature

F (Fahrenheit)

= (1.8 x C) + 32°

C (Celsius)

= 0.5556 x (F - 32°)

Weight

1 grain

= 64.8 mg

1 dram

= 1.77 g

1 oz (ounce)

= 28.35 g
1 lb (pound) = 0.4536 Kp
1 stone = 6.35 Kp
1 qu (quarter) = 12.7 Kp
1 US-cwt (hundred-weight) = 45.36 Kp

1 US ton (short ton)

= 0.907 t

1 brit. ton (long ton)

= 1.016 t

Force

1 lb

 = 4.448 N
1 brit. ton = 9954 N
1 pdl (Poundal) = 0.1383 N
I kp = 9.81 N
1 N = 0.102 kp

Velocity

1 mile/h

= 1.609 km/h

1 Knoten

= 1.852 km/h

1 ft/s

= 0.305 m/s

1 ft/min

= 5.08 x 10-3 m/s

Energy

1 lb/mile

= 0.282 kg/m

1 lb/yard

= 0.496 kg/m

1 lb/foot

= 1.488 kg/m

Radiation absorbed dose

1 Cray

= 1 J/kg

1 rad

= 10-2 J/kg = 1 Centi Gy = 0.01 Gy

1 Centi

= 100 Joule

1 rad

= cJ/kg = 0.01 Gy

1 Mrad

= 106 cJ/kg

Pressure
1 psi (lb/sq.) = 68.95 mbar
  = 6.895 x 10-3 Nmm²

1 lb/sq. ft.

= 0.478 mbar

1 pdl/sq. ft.

= 1.489 N/m²

1 in Hg

= 33.86 mbar

1 ft H2O

= 29.89 mbar

1 in H2O

= 2.491 mbar

1 N/mm²

= 145 psi = 10 bar

1 kp/mm²

= 1422 psi

1 at

= 736 Torr = 1 kp/cm²

1 Torr

= 1 mm Hg

1 bar

= 0.1 H Pa

1 Pa

= 1 N/m²

Density

1 lb/cu. ft.

= 16.02 kg/m³

1 lb/cu. in.

= 27.68 t/m³

Horse power

1 hp x h

= 1.0139 PS x h

 

 = 2.684 x 106 Joule

 

 = 746 Wh

1 BTU (brit. therm. unit) = 1055 Joule


Electrical units

1 ohm/1000 yd

= 1.0936 Ω/km

1 ohm/1000 ft

= 3.28 Ω/km

1 µF/mile

= 0.62 μ

1 megohm/mile

= 1.61 MΩ/km

1 µµf/foot

= 3.28 pF/m

1 decibel/mile

= 71.5 mN/m

Power rate

1 PS

= 0.736 kW

1 kW

= 1.36 PS

1 hp

= 0.7457 kW

1 kW

= 1.31 hp
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