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D4923-01 – Standard Test Method Technical Guide
This article provides an overview of ASTM D4923-01, which specifies requirements for reinforced thermosetting plastic poles used in outdoor lighting. These poles are suitable for electric power and telecommunication distributions, with mounting heights ranging from 10 ft (3.05 m) to 50 ft (15.24 m). The standard defines two classes of poles: standard design and stiff design.
📐 Scope and Terminology
The scope of D4923-01 covers poles for outdoor lighting, including anchor bases, arms, and direct burial options. Key terms include:
- Anchor base: A device attached to the pole bottom for mounting on a platform.
- Arm: A structural member supporting a luminaire, perpendicular to the pole.
- Direct burial: A pole designed for support by surrounding soil.
- Effective projected area (EPA): Maximum projected area times drag coefficient.
- Flexural fatigue: Property changes due to cyclical wind loading.
- Mounting height: Vertical distance from ground to light source center.
- Percent deflection: Ratio of pole-top deflection to height, expressed as percent.
| 🟦 Mounting Height (ft) | 📐 Mounting Height (m) | 🎯 Pole Class |
|---|---|---|
| 10 | 3.05 | Standard or Stiff |
| 20 | 6.10 | Standard or Stiff |
| 30 | 9.14 | Standard or Stiff |
| 40 | 12.19 | Standard or Stiff |
| 50 | 15.24 | Standard or Stiff |
⚙️ Design Parameters and Testing
Design parameters must be mutually agreed upon by the purchaser and supplier, taking into account service conditions, installation, and transportation. The standard includes poles with above-ground mounting and specifies various tests for material properties. Referenced standards include methods for dielectric breakdown, resistance to abrasion, and burning rate.
| 📏 Standard | 🎯 Description |
|---|---|
| ASTM A 153 | Zinc Coating on Hardware |
| ASTM C 131 | Aggregate Degradation by Los Angeles Machine |
| ASTM D 149 | Dielectric Breakdown Voltage |
| ASTM D 257 | D-C Resistance of Insulating Materials |
| ASTM D 635 | Rate of Burning of Plastics |
📊 Key Properties and Specifications
Key properties include percent deflection, flexural fatigue, and effective projected area (EPA). The standard uses inch-pound units as standard, with SI units in parentheses. Compliance with these specifications ensures reliability and safety in outdoor lighting applications.
Note: The safety and health practices must be established by the user, as the standard does not address all safety problems. Refer to Section 10 for test methods and precautions.
Tip: Always consult the latest referenced standards for accurate testing and material verification.
❓ Frequently Asked Questions
🔍 What is the mounting height range for these poles?
The standard covers poles with mounting heights from 10 ft (3.05 m) to 50 ft (15.24 m).
💡 What are the two classes of poles?
The two classes are standard design and stiff design, each with specific performance criteria.
⚡ How is percent deflection defined?
Percent deflection is the ratio of the pole-top deflection caused by a specific load to the above-ground height of the pole, expressed as a percentage.
📌 What is the effective projected area (EPA)?
EPA is the maximum projected area of an object multiplied by a drag coefficient for its specific shape.