ATC CABLE

SPECIFICATION FOR WIRE & CABLES COVERED UNDER IS : 694 (1990) CONSTRUCTION OF CONDUCTOR

NOMINAL CROSS SECTIONAL AREA
COPPER
Up to and including 6 mm2
Above 6 Mm2
ALUMINUM
Up to and including 6 mm2
Above 6 Mm2
SOLID / STRANDED FLEXIBLITY CLASS
Solid/Standard Class 1 or Class 2 of IS : 8130/1984
Stranded Class 2 of IS : 8130/1984

SINGLE CORE PVC INSULATED UNSHEATHED CABLES

Nominal Cross Sectional area of Conductor (mm2)	Nominal Cross Thickness of insulation (mm)	Overall Diameter Maximum (mm)	Nominal Cross Sectional area of Conductor (mm2)	Nominal Thickness of Insulation (mm)	Overall Diameter Maximum (mm)
1*	0.7	3.2	50	1.4	13
1.5	0.7	3.4	70	1.4	15
2.5	0.8	4.2	95	1.6	17.5
4	0.8	4.8	120	1.6	19
6	0.8	5.6	150	1.8	21
10	1	7	185	2	23
16	1	8.2	240	2.2	26.5
25	1.2	10	300	2.4	29.5
35	1.2	11.5	400	2.6	33.5
			500	2.8	37.5
			600	2.8	42

* For Copper Conditions Only

PVC INSULATED SHEATHED CABLE

Nominal Cross Senctional Area of Conductor	Nominal Thickness of insulation	Nominal Thickness Of Sheath Overall Dimensions				Overall Dimensions
Nominal Cross Senctional Area of Conductor	Nominal Thickness of insulation	Single core	Twin core	Three core	Four core	Single core	Twin core circular	Twin Flat	Three circular	Four circular
mm2	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm
1*	0.6	0.8	0.9	0.9	0.9	4.7	8.2	7.8´5.0	8.6	9.2
1.5	0.6	0.8	0.9	0.9	0.9	5	8.8	8.4´5.4	9.2	10
2.5	0.7	0.8	1	1	1	5.8	10.5	10´6.4	11	12
4	0.8	0.9	1	1.1	1.1	6.8	12	11.5´7.2	13	14
6	0.8	0.9	1.1	1.1	1.2	7.8	13.5	13.0´8.0	14.5	15.5
10	1	0.9	1.2	1.2	1.3	8.8	16.5	16.0´9.6	17.5	19.5
16	1	1	1.3	1.3	1.4	10.5	19	18.5´11.0	20	22.5
25	1.2	1.1	1.5	1.5	1.6	12.5	23	22.0´13.0	24.5	27.5
35	1.2	1.1	1.6	1.6	1.7	13.5	25.5	25.´14.5	27.5	30.5
50	1.4	1.2	1.7	1.7	1.8	15.5	29.5	29.0´16.5	31.5	35

* For Copper Conditions Only

SINGLE CORE, UNSHEATHED CABLE IN VOLTAGE GRADE 1100V

Nominal are of Conductor	Number/Nom Dia of Wire	Number/Nom Dia of Wire	Aprox Overall Diameter	Current carrying capacity# 2 cables, single phase		Resistance(Max.) per km. @ 20oC Ohms.
Nominal are of Conductor	Number/Nom Dia of Wire	Number/Nom Dia of Wire	Aprox Overall Diameter	In conduit/Trunking (Amps.)	Unenclosed clipped directly to a surface or on cable tray (Amps.)	Resistance(Max.) per km. @ 20oC Ohms.
0.75	24/2*	0.6	2.4	7
1	14/.3*	0.7	2.8	11	12	18.1
1.5	22/.3*	0.7	3.1	13	16	12.1
4.5	36/.3*	0.8	3.8	18	22	7.41
4	56/.3*	0.8	4.4	24	29	4.95
6	84/.3*	0.8	5.2	31	37	3.3
Standard Colour : Black, Red, Blue and Green (fcr earthing) Supplied in 90 Meter length in attractive packaging # A Per IS : 3961 (Part –V) – 1968 *As per conductor Class 2 of IS : 8130/1984

CURRENT CARRYING CAPACITY
The Current rating given in the tables are based on the following assumptions.

a) Maximum Conductor Temperature	-	70o C
b) Thermal Resistivity of Soil	-	150o C cm/w
c) Thermal Resistivity of PVC	-	650o C cm/w
d) Ground Temperature	-	30o C
e) Ambient Air Temperature	-	40o C
f) Depth of Laying (to the highest point of the cable laid direct in round or to the top surface of ducts)

CURRENT RATING FACTOR

Voltage Grade 1100 Volts	Depth of laying cm.	75	90	105	120	150	180 & above
	i) Upto 25 mm2	1.0	0.99	0.98	0.97	0.96	0.95
	ii) Above 25 mm2 & upto 300 mm2	1.0	0.98	0.97	0.96	0.94	0.93
	iii) Above 300 mm2	1.0	0.97	0.96	0.95	0.92	0.91

Variation in ground Temperature o C

Ground Temperature o C	20	25	30	35	40	45	50
Rating Factors	1.17	1.12	1.06	1.00	0.94	0.87	0.79	0.71

Variation in ambient air temperature o C

Ambient Temperature o C	20	25	30	35	40	45	50
Rating Factors	1.33	1.25	1.16	1.09	1.00	0.90	0.08