Physical Address
304 North Cardinal St.
Dorchester Center, MA 02124
D1351-20 – Standard Test Method Technical Guide
The D1351-20 standard specifies thermoplastic polyethylene insulation for electrical wire and cable. This material is suitable for continuous operation at conductor temperatures up to 75 °C and voltages up to 35,000 V for power applications.
📋 Scope and Application
This specification covers a thermoplastic insulation consisting substantially of polyethylene. It is intended for use on wire or cable operating at conductor temperatures up to 75 °C with a maximum conductor size of 1000 kcmil (507 mm²). The maximum voltage rating is 35,000 V for power applications and 9,000 V for series lighting.
| ⚡ Application | 🔋 Maximum Voltage (V) |
|---|---|
| Power | 35,000 |
| Series Lighting | 9,000 |
Tests are performed on insulated wire or cable to determine the relevant properties of the insulation material. Whenever two sets of values are given in different units, the first set is standard.
⚙️ Test Methods and Safety Considerations
The standard references several test methods, including ASTM D2633 for thermoplastic insulations and jackets. Aging of the material is defined as exposure to air at 100 °C for 48 hours.
| 📐 Parameter | 🎯 Specification |
|---|---|
| Conductor Temperature (Continuous) | 75 °C max |
| Conductor Size | 1000 kcmil (507 mm²) max |
| Aging Temperature | 100 °C |
| Aging Duration | 48 hours |
| Voltage Rating (Power) | 35,000 V max |
| Voltage Rating (Series Lighting) | 9,000 V max |
High voltage testing involves potential hazards. Solidly ground all conductive parts and provide means to ground parts after testing. Operators must be thoroughly instructed.
⚠️ Lethal voltages are a potential hazard during high voltage tests. Ensure proper design, grounding, and operator training to prevent accidents.
💡 The insulation material is tested on wire or cable solely to determine its relevant properties, not to test the insulated conductor or completed cable.
❓ Frequently Asked Questions
🔍 What is the maximum operating temperature for this insulation? The insulation is rated for continuous operation at conductor temperatures up to 75 °C.
💡 What is the maximum voltage for power applications? It shall not exceed 35,000 V.
⚡ What safety precautions are required for high voltage testing? All conductive parts must be grounded, and operators must be trained in safe procedures.
📌 What is the aging condition specified in the standard? Aging is exposure to air at 100 °C for 48 hours.