Dairyland
Neutral Isolator
SKU: NI
Reliable Stray-Voltage Mitigation
Since 1983, Dairyland has offered the Neutral Isolator as the preferred solution for addressing “stray voltage” on farms. Power utilities who wish to isolate their primary neutral from the customer’s secondary neutral can prevent undesirable primary neutral-to-earth voltage (NEV) from affecting the customer system. Where utilities have concerns about NEV effects on dairy or other livestock operations, the Neutral Isolator offers the most effective and safe solution for separating the two systems under normal conditions, yet solidly re-bonding the two ground grids under lightning or AC fault conditions.
Note: The Dairyland model VTNI is not authorized for use in solving nuisance shock to persons at swimming pools or similar human health situations where structure to ground voltage is present.
Key Benefits
- Neutral isolation: Isolates the utility primary neutral/grounding system from the customer’s secondary neutral/grounding system under normal operating conditions.
- Overvoltage protection: Automatically reconnects the two grounding systems when the voltage difference exceeds a predetermined value for a predetermined time.
- Transient voltage blocking: Designed to prevent short-duration transient overvoltages from causing nuisance conduction while maintaining a lower switching threshold for 60 Hz steady-state conditions.
- Automatic reset: Automatically returns to voltage-blocking mode when current through the terminals goes through zero.
- Autonomous operation: Requires no external energy or power source.
Specifications
- Device Type: Solid-state, lightning- and fault-rated switching device
- Operating Voltage: For use on 15 kV, 25 kV or 35 kV class distribution systems
- 60 Hz Switching Threshold: 45 V peak
- Lightning Surge Current: 30,000 A crest (8 × 20 μs waveform)
- 60 Hz AC-RMS Current Ratings: 3,200 A for 1 cycle; 2,400 A for 3 cycles; 1,900 A for 10 cycles; 1,700 A for 30 cycles
- Operating Temperature: -40°F to +140°F (-40°C to +60°C)
- Terminals: Two identical terminals, each accommodating #8 through 1/0 AWG copper ground conductor
- Connection: Bi-directional; primary and secondary neutrals can be connected to either terminal
- Enclosure: Waterproof and moisture-proof, non-conducting, non-corrosive polycarbonate
- Mounting: Pre-assembled to a non-metallic bracket for wood utility pole mounting
- Weight: 7 lb (3.2 kg)
- Compliance: NESC Rule 97D2, REA Rule and 7 CFR 1724.52
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Shipping & Returns
Shipping costs and delivery timelines vary by order. All returns require prior written approval and may be subject to a restocking fee.
Please review our Terms & Conditions for complete shipping, return, and warranty details.
