Bracket For Fixing High-voltage Disconnect Switches Using Embedded Steel Plates
Securing the support structures for a high voltage isolator switch requires robust engineering methods. A widely accepted industry practice utilizes embedded steel plates and through-wall bolts cast directly into concrete. This approach ensures maximum structural stability, counters operational vibrations, and maintains the precise alignment necessary for heavy-duty electrical installations.
Technical Specifications for Wall-Mounted Supports
Selecting the correct materials and dimensions prevents mechanical failure during heavy switching operations.
| Component | Standard Dimension / Material | Purpose |
|---|---|---|
| Embedded Steel Plate | Q235B / 12 mm thickness | Load distribution and welding base |
| Through-Wall Bolts | M20 Grade 8.8 Galvanized | High tensile shear resistance |
| Concrete Strength | C30 minimum grade | Structural foundation integrity |
Step-by-Step Installation Process
Implementing this method involves precise alignment and casting techniques to achieve long-term reliability.
Phase 1: Pre-Casting and Alignment
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Position the 12 mm thick steel plate against the concrete formwork before pouring.
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Drill exact positioning holes to accommodate the M20 through-wall bolts.
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Secure the bolt assembly to the internal reinforcement rebar network to prevent shifting during concrete pouring.
Phase 2: Concrete Pouring and Curing
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Pour the C30 concrete mix evenly around the plate and bolt assembly.
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Use mechanical vibrators to eliminate air pockets near the reinforcement zone.
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Allow a standard 28-day curing cycle to ensure the foundation reaches maximum load-bearing capacity.
Phase 3: Mounting the Bracket
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Align the hv isolator switch support bracket with the exposed bolt threads.
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Fasten the bracket using double nuts and spring washers to prevent loosening from mechanical vibrations.
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Verify vertical and horizontal alignment using a digital spirit level before final torque application.
Mechanical Benefits of Through-Wall Bolt Fixation
Using embedded plates paired with through-wall bolts offers superior mechanical advantages over standard expansion anchors. It provides uniform stress distribution across the concrete wall, preventing localized cracking. This heavy-duty installation method successfully absorbs the high torque generated when a high voltage electrical isolator opens or closes. Furthermore, the galvanized components offer excellent corrosion resistance, extending the operational lifespan of the entire isolator high voltage setup.
