Sharp R-65STR Technical Information download pdf (Page 71)

Technical Reference

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CALCULATING VOLTAGE DROP

All wire has a finite resistance to current flow. This resistance causes a voltage to develop across the length of a current carry-

ing conductor. The result is that the intended load is robbed of the full potential of its source battery.

The tables below are calculated for the two allowable percent voltage drops specified by ABYC (cf. E-11.16). Conductors shall

be sized for a voltage drop not to exceed:

 3%: For conductors feeding panelboard or switchboards, bilge blowers, navigation lights, electronic equipment, and any

other cir

cuit where voltage drop must be kept to a minimum.

10%: For conductors used for general lighting (other than navigational lights) and other non-critical circuits.

o calculate the size of the wire required for a given voltage drop the following formula is used:

CM = The required circular mil area of the wire (See table 1).

K = Equals 10.75, (represents the mil-foot resistance of copper)

I = The load current in amperes. (Note: for maximum current carrying capabilities of a conductor refer to Table 4).

L = The round trip length of the wire measured in feet from the positive terminal of the source, to the load, and back

to the source’s negative terminal.

E = The voltage drop on the conductor in volts. For example, a 3% drop from a 12 volt source results in: E = (12 x

0.03) = 0.36

AWG AWG Square mm ISO ABYC CM Area E-11.16 Tbl. XII SAE CM Area

(All UL Wire) J1127, J1128

18 .82 0.8 .75 1,620 1,537

16 1.31 1 1.5 2,580 2,336

14 2.08 2 2.5 4,110 3,702

12 3.31 3 4.0 6,530 5,833

10 5.26 5 6.0 10,380 9,343

8 8.39 8 10.0 16,510 14,810

6 13.3 13 16.0 26,240 24,538

4 21.2 19 — 41,740 37,360

2 33.6 32 35.0 66,360 62,450

1 42.4 40 — 83,690 77,790

1/0 53.5 50 50.0 105,600 98,980

2/0 67.7 62 70.0 133,100 125,100

3/0 85.6 81 95.0 167,800 158,600

4/0 107 103 — 211,600 205,500

TABLE 1: CONDUCTOR CIRCULAR MIL (CM) AREA

CONVERSION FACTORS

ENGLISH/METRIC

METRIC/ENGLISH

LENGTH AREA VOLUME MASS

Inch x 25.40 = Millimeters Sq. Inch x 6.452 = Sq. Centimeter Cu. Inch x 16.39 = Cu. Centimeter Ounce x 28.35 = Gram

Millimeters x 0.03973 = Inches Sq. Centimeter x 0.155 = Sq. Inch Cu. Cm. x 0.06102 = Cu. Inch Gram x 0.03527 = Ounce

Feet x 0.3048 = Meters Sq. Foot x 0.0929 = Sq. Meter Cu. Foot x 0.02832 = Cu. Meter Pound x 0.4536 = Kilogram

Meters x 3.281 = Feet Sq. Meter x 10.76 = Sq. Foot Cu. Meter x 35.31 = Cu. Foot Kilogram x 2.205 = Pound

Miles x 1.609 = Kilometers Sq. Mile x 2.59 = Sq. Kilometer Kilogram/km x 0.6214 = Pounds/kft

Kilometers x 0.6214 = Miles Sq. Kilometer x 0.3861 = Sq. Mile Pounds/kft x 1.4881 = Kilogram/km

Ohms/km x 0.3048 = Ohms/kft Circular Mil x 0.7854 = Sq. Mil

TEMPERATURE CONVERSION FORMULAE

CENTIGRADE/FARENHEIGHT FARENHEIGHT/CENTIGRADE

C = (

F - 32)

F = (

C + 32)

CM =

K x l x L

1 2 ... 66 67 68 69 70 71 72 73 74 75 76

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