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Electrical wire size is directly dependant on the load amperage that is connected to it. The higher the load amperage, the larger the cross sectional area of the wire needs to be. The connected amperage to a conductor is determined by a group of electrical experts and their results are then written into the latest addition of the electrical code book of the country in which you live.

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10y ago

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It is determine by the load or amperage required.

15 amp = #14 wire

20 amp = #12

30 amp = #10

40 amp = #8

55 amp = #6

100 amp = #3

200 amps =#3/0

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11y ago
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Cable sizes for electrical installations are determined by the load current. The load current is obtained from the manufactures nameplate that is on the device to be connected. The electrical code book states what the amp capacity (ampacity) for specific wire sizes will be.

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13y ago
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The National Electric Code provides such information.

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13y ago
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You can measure its diameter using a micrometer.

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10y ago
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Q: How do we calculate the cable size for electrical installations?
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