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