CM, CMWW series busbar type wall bushing (hereinafter referred to as bushing) is suitable for distribution equipment in three-phase AC system power stations and substations with rated voltage (10-35) kV and frequency (15-60) Hz. It is used for conductive parts to pass through partitions, walls or other grounding objects, providing insulation support and fixing connections between external wires (busbars)

Product model and meaning
CL - Indoor aluminum conductor wall conduit
CW - Outdoor and Indoor Copper Conductor Wall Conduit
CWL - Outdoor and Indoor Aluminum Conductor Wall Conduit
CWWL - Anti pollution outdoor and indoor aluminum conductor wall conduit
C - Indoor copper conductor through wall conduit
CM - Indoor busbar type wall conduit
CMW - Outdoor and Indoor Busbar Wall Conduit
CMWW - Pollution resistant outdoor one indoor busbar wall conduit
For conductor sleeves, the fraction after short horizontal alignment; Molecular rated voltage in kilovolts for the sleeve; The denominator is the rated current amperage of the casing, and the second short horizontal digit is the pollution level number
For busbar type conduit, the first short horizontal digit after the letter represents the rated voltage in kilovolts; The second short horizontal digit is the diameter in millimeters of the inner hole of the ceramic sleeve; The third short horizontal digit is the pollution level number

Product manufacturing basis
GB77O Outdoor wall conduit for power stations with 35 kV and below
GB771 Indoor wall conduit for power stations with 35 kV and below
GB12944 Technical Conditions for High Voltage Through Wall Ceramic Bushings

Environmental conditions for the use of CM and CMWW series busbar type wall bushings
1) Indoor conduit
The ambient temperature is not higher than+40 ℃ and not lower than -40 ℃
Altitude not exceeding 1000m
The monthly average relative humidity should not exceed 90%
The surrounding air should not be significantly polluted by corrosive or flammable gases, water vapor, etc
No frequent and intense vibrations
2) Outdoor casing
The ambient temperature shall not be higher than+40 ℃ and not lower than -40 ℃;
Altitude not exceeding 1000m;
Wind speed not exceeding 34m/s
The air pollution level of the product's usage environment is classified into four levels according to GB5582: 0, I, II, III, etc;
No frequent and intense vibrations

Product Features
The sleeve is composed of ceramic parts, metal accessories, installation flanges, and conductive bars (rods).

Installation and usage precautions
The casing should be used under specified environmental conditions. Before installation, the casing model and specifications should be determined.
Before installation, all parts of the sleeve must be wiped clean, especially the ceramic parts and conductive contact parts

Ordering Instructions
It should indicate: casing model, rated voltage, rated current, and quantity, etc.

CM, CMWW series busbar type wall bushing