18.1 For purposes of determining compliance with the specified limits for requirements of the properties listed in the following table, an observed value or a calculated value shall be rounded as indicated in accordance with the rounding method of Practice E29.

Property

Rounded Unit for Calculated
or Observed Value

 Chemical composition

nearest unit in the last right-hand place of figures
  of the specified limit

 Hardness

 Electrical resistivity

nearest unit in the last right-hand place of figures

 Electrical conductivity

 Tensile strength

nearest ksi (5 MPa)

 Elongation: below 5 %

nearest multiple of 0.5 %

 5 % and over

nearest 1 %

This specification covers seamless copper bus pipe and tube intended for use as electrical conductors. The material shall be manufactured by such hot-working, cold-working, and annealing processing as to produce a uniform, seamless wrought structure in the finished product. The method of manufacture shall be such that the finished material conforms to the specified temper properties. The material shall conform to the requirements for the copper UNS no. as specified. The material shall be furnished in either the O60 (soft anneal) or H80 (hard drawn) temper. The material shall conform to the maximum electrical resistivity requirements prescribed. The product shall conform to the prescribed mechanical property requirements. The product shall conform to the prescribed bend testing requirements. The test specimens of material designated as Copper UNS Nos. C10100, C10200, C10300, C10400, C10500, C10700, and C12000 shall be free of cuprous oxide. When tested, material designated as Copper UNS nos. C10100, C10200, C10300, C10400, C10500, C10700, and C12000 shall pass the embrittlement test. The product shall be passed through an eddy-current testing unit adjusted to provide information on the suitability of the product for the intended application.

1.1 This specification establishes the requirements for seamless copper bus pipe and tube intended for use as electrical conductors.

1.1.1 The product shall be made from one of the following coppers, as denoted in the ordering information:2

Copper
UNS No.2

Previously
Used
Designation

Type of Copper

  C10100

 OFE

Oxygen-free, electronic

  C10200

OF

Oxygen-free without residual deoxidants

  C10300

—

Oxygen-free, extra low phosphorus

  C10400, C10500,
   C10700

 OFS

Oxygen-free, silver bearing

  C11000

 ETP

Electrolytic tough pitch

  C11300, C11400,
   C11600

 STP

Silver-bearing tough pitch

  C12000

 DLP

Phosphorized, low residual phosphorus

1.2 Unless otherwise specified, any one of the above coppers may be furnished.

1.3 Units—The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units, which are provided for information only and are not considered standard.