Electrical Conductor Specifications and Crossings

BT06 Bare Conductors Specifications

Breaking Load:

410 daN

Braces and Struts:

1400 daN

Ultimate Safety Factor

• Metallic: 1.5
• Reinforced Concrete: 2.5
• Wood: 3.5
• Non-metallic: 2.5

1. Isolated Conductors

• Cables Perched

  • Distance from floor: 2.5m
  • Windows: 0.3m top, 0.5m bottom and sides
  • Balconies: 0.3m top and bottom, 1m sides

• Tension Cables

  • Ground distance: 4m
  • Mechanical strength: 800 daN

2. Bare Conductors

• Distance from ground: 4m

• On the Roof

  • Flat parallel: 1.8m if connected to ground, 1.50m otherwise
  • With inclination of 45 degrees: can be reduced to 1m

• Terraces and Balconies

  • Flat parallel: 3m

• Facades

  Protection zone limited to:

  • Plane parallel to the wall at 1m from windows or balconies, further limited by:
    • Plane parallel horizontal top: 0.30m
    • 2 vertical planes, one on each side of the opening: 1m
    • Horizontal plane below sills: 3m

Separation: Bare Conductors & Walls

• Up to 4m: 0.10m
• 4m to 6m: 0.15m
• 6m to 30m: 0.20m
• 30m to 50m: 0.30m
• Over 50m: D = 0.55 * √F

Minimum Vertical Distance of Crossings

D = 1.5 + (U + L1 + L2) / 100

3. Crossings

• Other BT Electric Lines

  • Bare conductors / Different supports: Superior to 0.50m

• Telecommunications Lines

  • Various supports: 1m
  • Same support: 0.5m

• Roads and Railways (Non-Electric)

  • Breaking load > 410 daN (bare)
  • Insulated conductors: 280 daN
  • Minimum height: 6m

• Trolleybuses, Trams, Railways (Electric)

  • Minimum height: 2m
  • Separation: 0.30m (BT conductors)

• Cable Cars and Carriers

  • BT line: 2m above, 3m below

• Rivers and Waterways

  • Minimum height: H = 1 + G (if G known), 6m (if G unknown)

• Radio and TV Reception Antennas

  • Bare conductors: 1m

• Water and Gas Pipelines

  • Distance between cable: 0.20m

Specific Crossing Requirements

• With High Voltage Overhead Lines

  • >= 2m (k)
  • 3m minimum (66kV+)

• With BT Lines or Telecommunications

  • Insulated conductors: 0.1m
  • Bare conductors (on support): can be reduced to 0.5m

• With Streets and Highways

  • 6m (area)
  • 5m (road traffic)
  • Other cases (bare conductors)
  • Insulated conductors: can be reduced to 4m

• Rail, Trams, and Trolley

  • 1.5m minimum horizontal distance

• Water Pipes

  • 0.20m minimum distance
  • 1m away from joints

• Gas Pipes

  • 0.20m
  • High pressure gas (> 4 bar): 0.40m
  • Distance between cables and bare conductors: 1m (into pipeline)