Ice Radio Products

Bulkhead Grounding for Telecommunication Facilities

Many telecommunication facilities, from broadcast to amateur services, suffer from inadequate grounding. Despite claims of "full lightning protection," poor grounding leads to frequent lightning damage and interference, costing insurance companies thousands in claims annually.

The issue often stems from grounding being treated as an afterthought, rather than a priority. A skilled engineer understands that the grounding system is the first and most critical part of station design. One of the most effective, affordable, and simple grounding methods is the bulkhead grounding system.

What Is Bulkhead Grounding?

A bulkhead ground system consists of a metallic fixture or plate that intercepts lightning surges before they reach equipment. This prevents damage and protects operators from dangerous surges.

Why Bulkhead Grounding Works

In typical setups, antenna lines connect directly to equipment, with a ground wire attached afterward. This places the equipment (and operator) in the path of surges, often causing damage or injury. A bulkhead system intercepts surges at the entry point, shunting them to ground before they enter the facility.

Key Components and Setup:

  1. Bulkhead Plate – A low-inductance, high-integrity earth terminal.

    • Ideal materials: Aluminum (1/8” thick), copper, or steel.
    • Commercial relay rack panels work well and are widely available.

  2. Placement –

    • Close to or at ground level with short (under 1 foot) leads to the ground rod.
    • Mount it indoors against an exterior wall for easy access and weather protection.

  3. Connecting Lines –

    • Pass all incoming lines (coaxial, control, rotator, AC power, phone) across the bulkhead.
    • Attach lightning protection devices, antenna switches, and filters directly to the plate.
    • Keep all leads short and tightly connected to reduce interference.

  4. Grounding Strategy –

    • Avoid multiple grounds to prevent current division during a strike, which can induce damaging currents across equipment.
    • Bond all connections with anti-oxidants (e.g., Burndy Penetrox, Ideal Noalox, I.C.E. Model 601/602) to ensure long-term electrical contact.

Benefits of Bulkhead Grounding:

  • Protects Equipment – Stops lightning surges before they enter the station.
  • Reduces Interference – Minimizes noise and improves overall station performance.
  • Expands Easily – Choose a plate larger than current needs to allow for future growth.

Bulkhead grounding is a simple yet highly effective solution. Once implemented, it becomes an essential part of your station’s lightning protection and noise reduction strategy.