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你查一下UL標準就行了，20276是其中的一種線規(guī)

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UNDERWRITERS LABORATORIES INC.              APPLIANCE WIRING MATERIAL

Subj. 758     Section 2     Page 20276       Issued:  1983-08-16

                                Revised:  2003-06-05

Style 20276       Electronic Cable.

______________________________________________________________________________

Rating     60°C or 80°C, 30 V.

______________________________________________________________________________

Insulated     No. 40 AWG minimum.  Labeled or complying with AWM

Conductors    Procedure having a minimum rating of 60°C or 80°C

           whichever is applicable.

______________________________________________________________________________

Assembly      Consists of two or more conductors, twisted pairs,

           parallel pairs, or groups of twisted conductors or

           parallel pairs twisted together.  The conductors or

           groups of conductors may be laid parallel forming a flat,

           oval or round cable.  The lay of the insulated conductors

           are not specified.  A barrier layer and/or fillers are

           optional.  Manufacturer shall maintain a complete

           description of each assembly.  May use same or mixed AWG

           size.

______________________________________________________________________________

Covering      (Optional.)  A 6 mil or heavier PVC covering may be

           extruded over the conductor assembly.

______________________________________________________________________________

Shield     Optional.

______________________________________________________________________________

Jacket     PVC, Class 43.

               Thickness (mils)

                 Construction A       Construction B

               External Use          Internal Use

           #Dia. under                  Minimum         Minimum

            jacket in        Minimum    at       Minimum      at

             inches__     Average   any Point   Average   any Point

           0.350 or less     20        17         15         12

           0.351 - 0.700     30        24         30         24

           0.701 - 1.00      40        36         40         36

           0.101 - 1.50      54        48         54         48

______________________________________________________________________________

Standard      Appliance Wiring Material UL 758.

______________________________________________________________________________

                            (Continued on Page 20276A)

UNDERWRITERS LABORATORIES INC.                APPLIANCE WIRING MATERIAL

Subj. 758     Section 2     Page 20276A        Issued:  1983-08-16

                                Revised:  2003-06-05

Instructions  Detailed Examination.

to UL         Physical Properties of Jacket.

Representative   

           The designation of all Styles of the individual

conductors used making up the cable assembly shall be

available, and the UL Representative's tag shall indicate

if the Style is labeled or not.  If they are not labeled,

the appropriate Follow-Up Tests shall be conducted.

______________________________________________________________________________

UL         (4)  Detailed Examination.

*Counter-Check    (4)  Physical Properties of Jacket.

*Program      (4)  Heat Shock.

*          (4)  Cold Bend.

*          (4)  Deformation.

           (12) Cable Flame Test on Completed Cable,

                Construction A only.

           (12) Horizontal Flame Test on Completed Cable,

                Construction B only.

           If the insulated Styles are not labeled, the appropriate

           Follow-Up Tests shall be conducted.

______________________________________________________________________________

Marking       General.

______________________________________________________________________________

Use        Construction A:  Internal wiring or external

           interconnection of electronic equipment in Class 2

           circuits only.

           Construction B:  Internal wiring of electronic equipment

           in Class 2 circuits only.

謝謝

我也學習一下。。謝謝fourwo ！

最新的20276（2009年01月份的版本）