2025-07-31
The weight of a pole-mounted transformer varies significantly based on its size (kVA rating), voltage class, and construction.If you need a pole-mounted transformer, please contact our company.
kVA Rating (Size): This is the biggest factor. Higher capacity transformers are much heavier.
Voltage Class: Transformers for higher primary voltages (e.g., 34.5kV) are generally larger and heavier than those for common distribution voltages (e.g., 7.2kV, 14.4kV).
Construction Type: Conventional oil-filled vs. CSP (Completely Self-Protected, which includes internal fuses and arrester) vs. newer designs or dry-types (less common on poles).
Accessories: Mounted lightning arresters, fused cutouts, meter sockets, etc., add weight.
Oil: The insulating/cooling oil is a major contributor to the total weight.
| kVA Rating | Typical Weight Range | Common Applications |
|---|---|---|
| 5 - 25 kVA | 150 - 400 lbs (70 - 180 kg) | Small residential services |
| 25 - 50 kVA | 400 - 800 lbs (180 - 360 kg) | Larger homes/small multi-family |
| 50 - 100 kVA | 800 - 1,500 lbs (360 - 680 kg) | Small commercial/apartment buildings |
| 100+ kVA | 1,500 - 3,000+ lbs (680 - 1,360+ kg) | Larger commercial/industrial |
Mounting Hardware: The weight figures above are usually for the transformer tank and core/coils itself. The crossarm, pole bracket, associated cutouts (fuses), lightning arresters, and secondary rack add several hundred more pounds to the total load on the pole.
"Average" Residential Transformer: A very common size for feeding 1-4 houses is 37.5 kVA or 50 kVA. These typically weigh between 600 lbs and 1,200 lbs (270 - 540 kg), with 800-1000 lbs being a very common range.
Heavy Weights: Transformers over 100 kVA become significantly heavy (1500 lbs+) and require robust poles (often thicker Class 1 or special structures) and sometimes special handling equipment during installation.
Exact Weight: For a specific transformer, the only way to know the exact weight is from the manufacturer's nameplate or specification sheet for that model.
In summary: While a small transformer might weigh as little as 150-200 lbs, the most common pole transformers (25-50 kVA) typically weigh between 600 and 1,200 pounds (270 - 540 kg).
Always remember this is just the transformer; the supporting hardware adds substantial additional weight to the pole structure. For large commercial units, weights can easily exceed 2,000 pounds. If you need a precise weight for a specific location, the utility company would have the exact specifications.
