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Technical Information

Mon, 12/02/2013 - 03:53 -- admin

Table .1 – maximmiom dc condvetor resistance & L/R ratio

Nominal

Area of

Conductor

No. & Diameter of wires

Maximum d.c Conductor Resistance at 20 ° c

Maximum

L/R Ratio

(for Adjacent Cores)

Plain wires

Tinned wires

Multi-pair

Multi-core

Multi-pair

Multi-core

mm2

No./mm

Ohm/km

Ohm/km

Ohm/km

Ohm/km

µ H/ohm

0.5

7/0.30

36.8

36.0

37.5

36.7

25

0.5

16/0.20

39.8

39.0

40.9

40.1

25

0.5

1/0.80

36.8

36.0

37.5

36.7

25

0.75

7/0.37

25.0

24.5

25.3

24.8

25

0.75

24/0.20

26.5

26.0

27.3

26.7

25

1.0

7/0.43

18.4

18.1

18.6

18.2

25

1.0

1/1.13

18.4

18.1

18.6

18.2

25

1.5

7/0.53

12.3

12.1

12.5

12.2

40

2.5

7/0.67

7.56

7.41

7.71

7.56

 

Note: As BS 6360/ IEC 60228 resistance values only allow for multi-core cables, an additional two percent of the maximum resistant has been allowed for cables of multi-pair construction.
Table 2- Minimum Insulation Resistance & Maximum Capacitance

Technical Items

PVC Insulated

Instrumentation Cables

PE & XLPE Insulation

Instrumentation Cable

1.Maximum Insulation Resistance at 20 ° c  
a. Individual conductor ( between each conductor  
& remaining bunched conductors/screens/armour)
 25 MΩ.KM  5000 MΩ.KM
 b.Individual screens (between screens)  1 MΩ.KM  1 MΩ.KM
 2.Maximum capacitance  
a.Maximum mutual capacitance of pair or adjacent    
cores at 1 KHZ
250 pF/m  NA
 b.Maximum capacitance between any core & all   
other cores connected to screens/armour & earth    
at 1 KHZ
 450 pF/m NA
 c.Maximum mutual capacitance of cables without   
indiviual pair screen
at 1 KHZ
 NA  75 pF/m (≤ 1.0 mm2)
85 pF/m (1.5 mm2)
 d.Maximum mutual capacitance of all cables with   
individual pair screen & 1 pair/ 1triple/ 2 pairs   
(1Q) cables with collective screen ar 1 KHZ
NA 115 pF/m
 e.Maximum capacitance unbalance at 1 KHZ  NA  250 pF/250m

Table 3- Minimum Bending Radius

For safety installation without damaging electrical and physical properties, the tabulated minimum bending radius must be observed.

Type of Cables

Overall Diameter

(mm)

Minimum

Bending Radius

Single- Core PVC or LSOH Insulated
Non-Sheathed Cables
Up to 10
10 to 25
Above 25
 3D
4D
6D
PVC or XLPE Insulated Braided/
Armoured Power Cables
Any 8D
All Type of Instrumentation Cables Any 8D

Note : D means the overall diameter of the cable


Pairs No. Pair colour
Conductor A Conductor B
1    
2    
3    
4    
5    
6    
7    
8    
9    
10    
11    
12    
13    
14    
15    
16    
17    
18    
19    
20    
21    
22    
23    
24    
25    

 

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