via Tony Moscioni 1/17/2003

COMPARING RW90 & T90/TWN75

Nexans stocks both RW90 and T90/TWN75 but we would like to point out the superiority of RW90 for most applications:

SUNLIGHT RESISTANCE -T90/TWN75 is not sunlight resistant in any colour or any size. RW90 is sunlight resistant in BLACK #6 and larger. No other colour or size RW90 is sunlight resistant.

TEMPERATURE RATING - RW90 is 90° C rated in both wet and dry installations, while T90/TWN75 is 90° C dry and 75° C wet. This may result in a smaller conductor size for a given current requirement in a wet location such as underground duct. In addition this may result in a smaller duct size.

CONDUIT FILL - Since 1995 Nexans, as well as most other manufacturers, has been making it’s standard stock RW90 with a 600 volt insulation thickness. This results in a smaller outside diameter (O.D.). In sizes #14 to #6 T90/TWN75 still has a smaller O.D. In sizes #4 and larger RW90 now has an O.D. slightly less than T90/TWN75. This may result in a smaller conduit size or more wires of a given size in a conduit. Check Table #6 in the Canadian Electrical Code. There are a few cases where this applies, but Table #6 also shows that RW90 does not require a larger conduit in #4 and Larger.

SIZE RANGE - RW90 is manufactured in sizes #14 AWG to 1000 MCM in copper and #4 AWG to 750 MCM in ACM aluminum. T90/TWN75 is manufactured in #14 to 500 MCM in copper only ( CSA limits T90/TWN75 to a maximum conductor size of 500 MCM).

COLD TEMPERATURE INSTALLATION - RW90 passes CSA’s cold impact test at -40° C and is marked -40. T90/TWN 75 passes CSA’s cold bend at -30° C and no cold impact is required for this product. Nexans recommends a minimum installation temperature of -10° C for T90/TWN75. With suitable handling precautions RW90 may be installed at ambient temperatures as low as -40° C.

For catalogue information on RW90 click picture:
For catalogue information on T90/TWN75 click picture:

          

RW90 VS T90/TWN75 COMPARISON CHART

  RW90 T90/TWN75
Voltage Rating 600 volts 600 volts
O.D.

 

 

 

 

 

Smaller than T90 in sizes #4 and larger. Smaller than RW90 in sizes #14 to #6.
In the majority of installations using circuit size conductors (3 or 4 conductors in conduit), RW90 requires the same conduit size as T90/TWN75.

Sizes #4 and larger, RW90 may require conduit smaller than T90/TWN75

Note: See Table #6 in the 1998 Canadian Electrical Code for conduit fill.

Stranding

 

Class B stranding.

 

Size #2 and smaller has Class "C" stranding, and will be slightly more flexible in these sizes.
Construction

 

Cross-linked polyethylene (XLPE) insulation. PVC insulation with Nylon covering.
RW90 is more resistant to abrasion, cracks and tears.
FT Rating

 

 

CSA applies no FT rating for RW90 products. FT1
The FT Rating is not relevant for cable in conduit.
Maximum Conductor Rating

 

90 degree C both Wet and Dry 90 degree C Dry 75 degree C Wet
This could result in a smaller duct size required for underground installations using RW90.
Cold Bend -40 degree Passes -30 degree but -10 degree only recommended
Sunlight Resistance Black #6 and larger is sunlight resistant. NOT sunlight resistant in any size or colour.
Black RW90 #6 and larger can be used as service entrance cable, even where exposed to sunlight.

 

COMPARISON OF CONDUIT FILL USING T90/TWN75 AND 600 VOLT RW90

CABLE SIZE

 

 

PRODUCT

CONDUIT SIZE (INCHES)

   

0.5

0.75

1

1.25

1.5

2

2.5

3

3.5

4

4.5

5

6

                             

14

RW90

8

15

25

43

59

97

139

200

200

200

200

200

200

   

T90/TWN75

12

22

36

62

85

140

200

200

200

200

200

200

200

12

RW90

6

11

19

33

45

74

106

164

200

200

200

200

200

   

T90/TWN75

9

16

26

45

62

102

145

200

200

200

200

200

200

10

RW90

5

8

14

24

33

55

78

121

162

200

200

200

200

   

T90/TWN75

5

10

16

28

38

63

90

139

187

200

200

200

200

8

RW90

2

4

7

13

18

30

43

67

90

116

146

183

200

   

T90/TWN75

3

5

9

16

22

36

52

80

100

138

173

200

200

6

RW90

1

3

5

10

13

22

32

50

67

86

108

136

196

   

T90/TWN75

1

4

6

11

16

26

37

58

80

100

125

157

200

4

RW90

1

2

4

7

10

16

23

36

48

62

78

98

142

   

T90/TWN75

1

2

4

7

9

16

23

35

47

61

77

96

140

3

RW90

1

1

3

6

8

14

19

30

41

53

66

83

120

   

T90/TWN75

1

1

3

6

8

13

19

30

40

52

65

82

118

2

RW90

1

1

3

5

7

11

16

25

34

44

55

70

101

   

T90/TWN75

1

1

2

5

7

11

16

25

34

43

55

69

99

1

RW90

1

1

1

3

5

8

12

19

25

33

41

52

75

   

T90/TWN75

1

1

2

3

5

8

12

18

25

32

40

51

73

1/0

RW90

0

1

1

3

4

7

10

16

21

27

34

44

63

   

T90/TWN75

0

1

1

3

4

7

10

15

21

27

34

42

62

2/0

RW90

0

1

1

2

3

6

8

13

17

23

29

36

53

   

T90/TWN75

0

1

1

2

3

6

8

13

17

22

28

35

51

3/0

RW90

0

1

1

1

3

5

7

11

14

19

24

30

44

   

T90/TWN75

0

1

1

1

3

5

7

11

14

19

23

29

43

4/0

RW90

0

0

1

1

1

4

6

9

12

15

20

25

36

   

T90/TWN75

0

0

1

1

1

4

5

9

12

15

19

24

35

250

RW90

0

0

1

1

1

3

4

7

10

13

16

21

30

   

T90/TWN75

0

0

1

1

1

3

4

7

10

12

16

20

29

300

RW90

0

0

1

1

1

2

4

6

8

11

14

18

25

   

T90/TWN75

0

0

1

1

1

2

4

6

8

11

13

17

25

350

RW90

0

0

0

1

1

2

3

5

7

9

12

16

23

   

T90/TWN75

0

0

0

1

1

2

3

5

7

9

12

15

22

400

RW90

0

0

0

1

1

1

3

5

6

8

11

14

20

   

T90/TWN75

0

0

0

1

1

1

3

5

6

8

10

13

19

500

RW90

0

0

0

1

1

1

2

4

5

7

9

11

17

   

T90/TWN75

0

0

0

1

1

1

2

4

5

7

9

11

16

600

RW90

0

0

0

0

1

1

1

3

4

5

7

9

13

700

RW90

0

0

0

0

1

1

1

3

4

5

6

8

12

750

RW90

0

0

0

0

1

1

1

2

3

4

6

8

11

800

RW90

0

0

0

0

1

1

1

2

3

4

5

7

10

900

RW90

0

0

0

0

0

1

1

1

3

4

5

6

9

1000

RW90

0

0

0

0

0

1

1

1

2

3

4

6

9

By : D.S. Reith, C.E.T. – Applications Specialist, Equipment Cables

Technical Bulletin #2 - APRIL 30, 2001