LBI-39067A
The self supporting lattice tower grounding system consists of a ground rod at each tower leg. If necessary, additional ground rods
Communication tower ladders need to be grounded
Yes, communication tower ladders should be grounded as part of the tower's overall grounding and bonding system to ensure safety and prevent electrical hazards.
Importance of Grounding Ladders
Communication tower ladders are typically made of metal and are in direct contact with the tower structure. Grounding these ladders is essential to prevent electrical shock to personnel and to safely dissipate energy from lightning strikes or other electrical surges into the earth, reducing the risk of step potential hazards and side flashes . Ungrounded ladders can become a dangerous path for electricity, especially during storms or when the tower experiences a ground potential rise (GPR), .
How Ladders Are Grounded
- Bonding to the Tower: Ladders should be electrically bonded to the tower structure using tinned copper wire or approved mechanical connections. This ensures that the ladder is at the same electrical potential as the tower .
- Connection to Grounding System: The tower itself must be connected to a grounding electrode system, which typically includes multiple ground rods or a buried ground ring. The ladder, being bonded to the tower, is therefore indirectly grounded through this system .
- Use of Bus Bars and Bonding Points: In some installations, a grounding bus bar near the base of the tower can serve as a central point to bond ladders, cable supports, and other metallic components .
- Exothermic Welding or Mechanical Fittings: For reliable connections, exothermic welding or irreversible mechanical fittings are recommended to bond ladders to the tower or grounding system, ensuring low-resistance paths .
Standards and Best Practices
- NEC Compliance: Metallic towers, including ladders, must be incorporated into the grounding electrode system as required by the National Electrical Code (NEC), .
- ANSI/TIA-607-B: Telecommunications grounding standards recommend bonding all metallic components, including ladders, to maintain a single electrical potential and protect personnel and equipment .
- Resistance Targets: The grounding system should aim for a resistance to earth of less than 25 ohms, and for critical equipment, less than 5 ohms may be required .
Summary
Grounding communication tower ladders is not optional; it is a critical safety measure. Proper bonding to the tower and integration into the tower's grounding system ensures that ladders do not pose an electrical hazard, protects personnel, and maintains the integrity of the tower's lightning protection system . Regular inspection and maintenance of these connections are also recommended to ensure ongoing safety and compliance.
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