Automotive cable

HEAD OFFICE 26/27, Errabalu Chetty Street, Chennai - 600 001. India. Tel : +91 44 2522 6141 / 2522 0859 Fax : +91 44 2522 2871 Email: sales@siechem.com Web : www.siechem.com All information given are in good faith. Siechem's liability is only to replace the defective portion of cables provided the same is mutually established as manufacturing defects within the guarantee period as agreed in writing & Siechem shall not be liable foranycompensation for lossesoranydamageseven ifcontracted termssayotherwise.Siechem reserves the right to reviseanyof theabovespecificationswithoutprior intimation.Subject toChennaiJurisdiction. CURRENT CARRYING CAPACITY WITH VOLTAGE DROP CALCULATION FOR AUTOMOTIVE CABLES The following general equations are is used to calculate the permissible Current as per JASO D 609: 2001 2 I r = (T - T )/ R 2 1 Where, I : Electric current of cable (A) r : Conductor resistance of cable ( Ω /cm) T : Maximum working temperature of conductor 1 (°C) T : Ambient temperature 2 (°C) R : Thermal resistance ( °C.cm/W ) Conductor resistance : 0 Furthermore, conductor resistance r at T C is calculated as follows, T1 1 r = r (1+ (T -20) T1 20 1 α Where, Where, r : Conductor resistance at 20 20°C α : Temperature coefficient Thermal resistance calculation R, R = R +R 1 2 R : Thermal resistance of insulator 1 ( °C.cm/W ) R : Surface diffusion thermal resistance 2 ( °C.cm/W) Specific thermal resistance of the insulator is: R = (P /2 ¶ )log (d /d ) 1 1 e 2 1 Where, P : Specific resistance of insulator 1 ( °C.cm/W) d : Outside diameter of conductor 1 (mm) d : Outside diameter of insulator ( 2 mm) Surface diffusion thermal resistance is, R =10P /¶d 2 2 2 Where, P : Specific surface diffusion thermal resistance of cable 2 ( °C.cm/W) When, d , ≤ 12.5 mm, P =300 + 32 d 2 2 2 When, d , ≥ 12.5 mm, P =700 2 2 Where, r : Conductor resistance at maximum temperature T1 ( Ω /cm) I : Permissible current (A) VOLTAGE DROP CALCULATION Voltage Drop : r * I T1 Tel +91 413 2671 070 / 2671 071 Email admn@siechem.com Web www.siechem.com RS 104/8 & 105/7, Sedarapet Main Road, RS 107/6 Sedarapet Main Road, Pondicherry - 605 101. India. Pondicherry - 605 101. India. Factories Unit II Unit I : : : AS 9100 ISO 45001 DGQA TUV RDSO IHQ IndianNavy ISO 9001 IATF 16949 ISO 14001 IRS Approvals & Licenses