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HEAD OFFICE
FACTORY
26/27, Errabalu Chetty Street,
Chennai - 600 001. India.
RS 104/8 & 105/7, Sedarapet Main Road,
Pondicherry - 605 101. India.
Tel :
+91 44 2522 6141
/ 2522 0859
Fax :
+91 44 2522 2871
Email:
[email protected]Web :
www.siechem.comTel :
+91 413 2671 070
/ 2671 071
Fax :
+91 413 2671 072
Email :
[email protected]Web :
www.siechem.comAll 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
TUV
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