MGG Series Tubular Busbar Fixed Support Clamp
The MGG Series tubular busbar fixed support clamp is a substation fitting designed to secure rigid tubular busbars to post insulators, support brackets or other approved mounting structures. It is commonly used in high-voltage substations, power plants and outdoor power-distribution installations where stable positioning of an aluminium tubular busbar is required.
The split circular clamp body allows the tubular busbar to be installed without passing the complete busbar through the support. The hinged support base and removable fasteners facilitate assembly, inspection and maintenance. Model selection is based primarily on the outside diameter of the tubular busbar and the mounting dimensions of the supporting structure.
Key Features
- Designed for rigid tubular busbar support in substations and power plants
- Split clamp construction for convenient busbar installation
- Available for multiple tubular busbar outside diameters
- Stable fixed-support arrangement for mechanical positioning
- Cast metal body with replaceable bolts, pins and retaining components
- Suitable for upright installation on post insulators or support structures
- Dimensions, mounting interface and materials can be customized according to approved drawings
Typical Materials and Construction
| Component | Typical Material | Typical Surface Treatment |
|---|---|---|
| Clamp body and keepers | Cast aluminium alloy | Natural cast finish or project-specified protective finish |
| Support base | Aluminium alloy or project-specified metal | According to material and approved drawing |
| Bolts, pins and washers | Carbon steel | Hot-dip galvanized |
| Retaining pins | Galvanized steel or stainless steel | According to the approved bill of materials |
Material grades and surface-treatment requirements must be confirmed against the manufacturer’s drawing, purchase specification and project environment before ordering.
Typical Model Selection
| Catalog Model | Suitable Tubular Busbar OD | Typical Base Dimension C | Mounting Hole Diameter | Approximate Weight |
|---|---|---|---|---|
| MGG-70 | 70 mm | 140 mm | 14 mm | 2.8 kg |
| MGG-80 | 80 mm | 140 mm | 14 mm | 4.0 kg |
| MGG-90 | 90 mm | 140 mm | 14 mm | 4.3 kg |
| MGG-100 | 100 mm | 140 mm | 14 mm | 4.5 kg |
| MGG-110 | 110 mm | 140 mm | 14 mm | Confirm by drawing |
| MGG-120 | 120 mm | 140 mm | 14 mm | 5.3 kg |
| MGG-130 | 130 mm | 140 mm | 14 mm | 7.3 kg |
| MGG-150 | 150 mm | 225 mm | 18 mm | 8.4 kg |
| MGG-170 | 170 mm | 225 mm | 18 mm | 9.5 kg |
| MGG-200 | 200 mm | 225 mm | 18 mm | 13.5 kg |
| MGG-250 | 250 mm | 254 mm | 18 mm | 19.5 kg |
Important: The values above are representative catalog data. Final dimensions, tolerances, fastener sizes and weights must be confirmed using the approved product drawing. Do not select a clamp only by its appearance.
Applications
- Rigid aluminium tubular busbar systems
- Outdoor and indoor electrical substations
- Power-plant busbar installations
- High-voltage switchyard busbar support systems
- Installation on post insulators and engineered support frames
- New substation construction, expansion and maintenance projects
Fixed Support and Thermal Expansion
This product is intended to provide a fixed mechanical support point. A complete tubular busbar system may also require sliding supports, expansion joints or flexible connectors to accommodate thermal movement, vibration and installation tolerances.
The arrangement of fixed and sliding supports must be determined by the project engineer. The MGG fixed support clamp should not be substituted for a sliding or expansion support where longitudinal busbar movement is required.
Quality Inspection
Recommended inspection items include:
- Verification of clamp bore and tubular busbar outside diameter
- Dimensional inspection against the approved drawing
- Visual inspection for casting defects, cracks and sharp edges
- Verification of bolt, pin and mounting-hole dimensions
- Coating-thickness inspection for galvanized steel components
- Assembly and fit inspection
- Mechanical load testing when required by the purchase specification
- Material certificates and inspection reports when specified in the order
Standards and Project Requirements
The fitting may be designed, manufactured and inspected according to the approved customer drawing, project technical specification and applicable requirements of GB/T 2314-2008, General Technical Requirements for Electric Power Fittings.
Compliance with a particular standard, mechanical load rating or test requirement must be stated in the purchase order and supported by the applicable inspection or test documentation. IEC or utility-specific compliance should not be claimed unless it has been verified for the ordered model.
Information Required for Quotation
- Required MGG model or tubular busbar outside diameter
- Busbar material and wall thickness
- Mounting-hole spacing and support-base dimensions
- Required installation orientation
- Fixed-support or sliding-support requirement
- Required material and surface treatment
- System voltage and project location
- Specified mechanical or short-circuit load
- Applicable standard and inspection requirements
- Required quantity, marking and packaging
Frequently Asked Questions
How do I select the correct MGG model?
Select the model according to the actual outside diameter of the tubular busbar and verify the mounting dimensions against the support structure drawing.
Is the MGG clamp suitable for aluminium tubular busbars?
Yes. The MGG series is commonly used with rigid aluminium tubular busbars. The material combination and contact arrangement must still be confirmed for the specific project.
Can the MGG clamp accommodate thermal expansion?
The standard fixed-support version restrains the busbar at its support point. Sliding supports or expansion fittings should be specified separately where longitudinal movement is required.
Can the dimensions be customized?
Yes. Busbar diameter, base dimensions, mounting holes, fasteners, materials, marking and packaging can be manufactured according to an approved drawing and order requirements.
