CBTM Medium Wall Bus Tubing: for services to 25 kV on unbolted bus bar
| Order Number |
Expanded |
Recovered |
Application Ranges |
| |
Internal Diameter
(min) D |
Wall Thickness
(nom) w |
Internal Diameter
(max) d |
Wall Thickness
(nom) w |
*Rectangular Bus Bar |
Round Bus Bar |
| |
|
|
|
|
MIN |
MAX |
MIN |
MAX |
| |
MM |
IN |
MM |
IN |
MM |
IN |
MM |
IN |
MM |
IN |
MM |
IN |
MM |
IN |
MM |
IN |
| 0750 |
19.0 |
0.75 |
1.14 |
0.045 |
5.5 |
0.22 |
2.70 |
0.109 |
6.4 |
1/4 |
6.4 |
1/4 |
6.8 |
0.27 |
15.2 |
0.60 |
| 1300 |
33.0 |
1.30 |
1.14 |
0.045 |
10.1 |
0.40 |
2.97 |
0.117 |
12.7 |
1/2 |
28.5 |
1 1/8 |
12.4 |
0.49 |
27.9 |
1.10 |
| 2050 |
52.0 |
2.05 |
1.14 |
0.045 |
19.0 |
0.75 |
2.79 |
0.110 |
31.5 |
1 1/4 |
50.8 |
2 |
22.3 |
0.88 |
43.1 |
1.70 |
| 2750 |
69.8 |
2.75 |
1.14 |
0.045 |
25.4 |
1.00 |
2.87 |
0.115 |
44.4 |
1 3/4 |
76.2 |
3 |
29.7 |
1.17 |
58.4 |
2.30 |
| 3500 |
88.9 |
3.50 |
1.14 |
0.045 |
29.9 |
1.18 |
3.09 |
0.122 |
57.1 |
2 1/4 |
101.6 |
4 |
35.8 |
1.41 |
73.6 |
2.90 |
| 4700 |
119.3 |
4.70 |
1.14 |
0.045 |
39.9 |
1.57 |
3.20 |
0.126 |
73.0 |
2 7/8 |
142.8 |
5 5/8 |
47.7 |
1.88 |
101.6 |
4.00 |
| 6700 |
170.1 |
6.70 |
1.14 |
0.045 |
58.4 |
2.30 |
3.17 |
0.125 |
114.3 |
4 1/2 |
203.2 |
8 |
69.5 |
2.74 |
144.7 |
5.70 |
CBTH Heavy Wall Bus Tubing: for services to 36 kV on unbolted bus bar
| Order Number |
Expanded |
Recovered |
Application Ranges |
| |
Internal Diameter
(min) D |
Wall Thickness
(nom) w |
Internal Diameter
(max) d |
Wall Thickness
(nom) w |
Rectangular Bus Bar* |
Round Bus Bar |
| |
|
|
|
|
MIN |
MAX |
MIN |
MAX |
| |
MM |
IN |
MM |
IN |
MM |
IN |
MM |
IN |
MM |
IN |
MM |
IN |
MM |
IN |
MM |
IN |
| 1100 |
27.9 |
1.10 |
1.67 |
0.066 |
8.9 |
0.35 |
3.88 |
0.153 |
9.5 |
3/8 |
12.7 |
1/2 |
10.6 |
0.42 |
17.7 |
0.70 |
| 2000 |
50.8 |
2.00 |
1.57 |
0.062 |
16.0 |
0.63 |
4.08 |
0.161 |
22.2 |
7/8 |
34.9 |
1 3/8 |
19.3 |
0.76 |
33.0 |
1.30 |
| 2700 |
68.0 |
2.68 |
1.52 |
0.060 |
22.1 |
0.87 |
4.08 |
0.161 |
34.9 |
1 3/8 |
50.8 |
2 |
26.1 |
1.05 |
43.1 |
1.70 |
| 3500 |
89.9 |
3.54 |
1.52 |
0.060 |
29.9 |
1.18 |
4.08 |
0.161 |
50.8 |
2 |
76.2 |
3 |
35.8 |
1.41 |
58.4 |
2.30 |
| 4700 |
119.9 |
4.72 |
1.57 |
0.062 |
39.9 |
1.57 |
4.19 |
0.165 |
69.8 |
2 3/4 |
111.1 |
4 3/8 |
47.7 |
1.88 |
81.2 |
3.20 |
| 6600 |
167.6 |
6.60 |
1.67 |
0.066 |
65.0 |
2.56 |
4.19 |
0.165 |
114.3 |
4 1/2 |
177.8 |
6 1/2 |
69.5 |
2.74 |
124.4 |
4.90 |
*Assume rectangular bus bars have 1/4 in thickness on min application ranges and 5/8 in thickness on max application ranges. Application ranges noted above selected to obtain minimum insulation thickness required to meet ANSI C37.20.2 withstand requirements at bus bar spacing and operating voltages noted. These spacings were determined from a limited number of test configurations. Due to the wide variety of bus bar configurations, these spacings and recovered wall thicknesses should not be employed by the user without actual verification and testing for the intended application. Spacing based on insulation wall thickness per application range of above table.
Clearances with Insulation
| System Voltage |
BIL |
CBTM Medium Wall Tubing |
CBTH Heavy Wall Tubing |
| |
|
P to P |
P to G |
P to P |
P to G |
| |
kV |
mm |
in |
mm |
in |
mm |
in |
mm |
in |
| 15 kV |
95 |
86.0 |
3.4 |
106.0 |
4.2 |
55.0 |
2.2 |
66.0 |
2.6 |
| 25 kV |
125 |
114.0 |
4.5 |
152.0 |
6.0 |
71.0 |
2.8 |
101.0 |
4.0 |
| 36 kV |
150 |
165.0 |
6.5 |
203.0 |
8.0 |
142.0 |
5.6 |
190.0 |
7.5 |
| 15 kV |
95 |
86.0 |
3.4 |
106.0 |
4.2 |
55.0 |
2.2 |
66.0 |
2.6 |
| 25 kV |
125 |
114.0 |
4.5 |
152.0 |
6.0 |
71.0 |
2.8 |
101.0 |
4.0 |
| 36 kV |
150 |
165.0 |
6.5 |
203.0 |
8.0 |
142.0 |
5.6 |
190.0 |
7.5 |
P to P: Phase to Phase orientation
P to G: Phase to Ground orientation
Spacing based on metal to metal dimension prior to insulation
Spacing based on insulation wall thinkness per application range of above table