3M Heat Shrinkable Tubing for Bus Bar BBI–A Series is designed for insulating rectangular, square and round bus bar rated from 5 kV through 35 kV. It will also cover and insulate inline bolted connections of rectangular bus bars. The tubing meets the requirements of ANSI/IEEE Standard C37.20. The standard tubing lengths are 20 feet (6,1 m) and 50 feet (15,2m). 3M BBI–A Tubing is made of a specially formulated cross-linked polyolefin. The tubing is colored orange-red. The material has high resistance to splitting, good solvent resistance and excellent tracking resistance properties. The tubing shrinks easily with industry standard methods, forming an aesthetically appealing insulation cover.
FEATURES:
Specially formulated cross-linked polyolefin
- Excellent physical properties
- Excellent dielectric strength
- Excellent tracking resistance
- Excellent chemical resistance
- Good thermal endurance
- Flame retardant; self extinguishing
- Flexible; conforms to bends
Heat shrinkable design
- Each tube fits a range of bus bar sizes and voltage ratings
- Tight fit provides good heat dissipation
APPLICATIONS:
For insulating electrical bus bars per ANSI/IEEE Standard C37.20:
- For 5, 8, 15, 25 and 35 kV voltage ratings
- For rectangular, square and round bus bars
- For inline bolted connections of rectangular bus bars
- For copper or aluminum bus bars
- For use in metal-clad switchgear
- For use on metal-enclosed bus bar
- For use with substation switchgear
| Electrical Properties | Typical Value |
| Dielectric Constant (ASTM D-150) |
3.5 |
| Dielectric Strength (70 mils) (ASTM D-149) |
550 V/mil (22 MV/m) |
| Volume Resistivity (ASTM D–257) (MIL–I–23053/15A) |
1.4 x 103 |
| Track Resistance (7 hrs.) (ASTM D–2303) (ANSI/IEEE C37.20) |
1 in. @ 2.5 kV (25mm @ 2.5 kV) |
| Physical Properties | |
| Tensile Strength (ASTM D–257) (MIL–I–23053/15A) |
2200 psi (15 MPa) |
| Ultimate Elongation (ASTM D–638) (MIL–I–23053/15A) |
575% |
| Water Absorption 7 days @ 23°C (73°F) (MIL–I–23053/15A) 0.3% |
0.3% |
| Corrosion (Copper) 16 hrs. @ 120°C (248°F) (MIL–I–23053/15A) |
Pass |
| Fluid Resistance 24 hrs. immersed (MIL–I–23053/15A) |
Tensile = 810–2400 psi (5.6–16.5 MPa) Dielectric Str. = 287–451 V/mil (11.3–17.8 MV/m) |