To select cross-section according to the current

1. Use

Various conductor cross-sectional flow (safe use of electricity) can usually find from the manual. But the use of formulas together with some simple mental arithmetic, can be calculated directly, without look-up table.

Cut the wire and the wire cross-section flow, but also with the wire material (aluminum or copper), model (insulated wire or bare wire, etc.), laying method (for surface or through pipes, etc.) and temperature (25 ℃ or less around large) and other related factors that affect the more complex calculations.

2. Formulas

Aluminum center section of insulated wire and multiple cross-sectional relationship between flow: S (cross section) = 0.785 * D (diameter) of the square

10, 5,100 on the next two, 25,35, four three realms, 70,95, two and a half. ①

Wear a tube, temperature, eight Jiuzhe. ②

And half bare. ③

Copper upgrade counted. ④

3. Help

Formulas based on aluminum insulated wire, for surface temperature of 25 ℃ in the environmental conditions prevail. If the conditions are different, formulas otherwise indicated.

Including various types of insulated wire rubber insulated wire or plastic insulated wire.