scope:

This specification covers the detail requirements for styles RW29, RW301/, RW31, RW321/, RW33, RW341/, RW35, RW361/, RW37, RW38, RW391/, and RW47 resistors.

The type designation shall be in the following form:

The style is identified by the two-letter symbol "RW" followed by a two-digit number; the letters identify power type, wire-wound, fixed resistors, and the number identifies the size, wattage rating, and construction of the resistors.

The characteristic is identified by a single letter that identifies the method of winding, maximum continuous operating temperate (surface hot spot), the minimum insulation resistance value at the end of the moisture resistance test, and the resistance temperature characteristic in accordance with table I.

The nominal resistance expressed in ohms is identified by a three-digit number; the first two digits represent significant figures and the last digit specifies the number of zeroes to follow. Where fractional values of an ohm are required, the letter "R" shall be substituted for one of the significant digits to represent the decimal point. When the letter "R" is used, succeeding digits of the group represent significant figures as shown in the following example:

R10 = 0.1 ohm 1R0 = 1.0 ohm

The letter "T" when added at the end of the type designation shall denote that the resistor is center-tapped.