ASTM F712 Standard for Electrical Insulating Plastic Guards: An Overview

The ASTM F712 standard, a critical benchmark in the realm of electrical insulating plastic guards, is a cornerstone for safety and efficiency in electrical installations. Rauckman proudly adheres to this standard, ensuring that our products meet the highest safety and performance criteria. This article provides an overview of the ASTM F712 standard, emphasizing its vital aspects and how Rauckman’s products align with these rigorous specifications. 


Key Aspects of the ASTM F712 Standard 

Applicable Guards and Covers: The ASTM F712 standard encompasses a variety of guards and covers, including: 

  • Conductor Guards and Connecting Covers: This category includes line guards, line guard connectors, insulator covers, dead-end covers, bus guards, and bus “T” guards. 
  • Structure and Apparatus Covers: This category is comprised of  pole guards, ridge pin covers, switch blade covers, arm guards, cutout covers, structural barriers, and cross arm guards. 

Method A-Withstand Voltage Proof Test: This test is integral to the ASTM F712 standard, ensuring that electrical insulating guards can endure specified voltage levels without failure. It’s a testament to the reliability and safety of the guards in high-voltage environments. 

  • Test Table 


Design and Acceptance Tests: The Difference 

  • Design Tests: These tests qualify a specific product design for field use, ensuring that the guard system component meets the necessary safety and performance standards. 
  • Acceptance Tests: These tests involve inspecting a sample from the production lot to ensure consistent quality and compliance with the ASTM F712 standard. While the industry standard is to test a certain number of products from a lot, Rauckman tests every single plastic insulating cover to ensure every guard will protect line workers when used in the field. 


Materials Requirements: 

  • ASTM F712 Construction Requirements: The insulating body shells are crafted to meet stringent requirements, including impact strength, water absorption, dielectric strength, and flame retardancy. 
  • Types of Guards: Specifications for different types of guards (Type I, Type II, Type III Guards) include detailed criteria for notched izod impact strength, water absorption, dielectric strength, and flame retardancy. 

Testing Methods: Material ratings adhere to specific testing methods, including Test Methods D256, D570, D149, and UL Standard 94. 

  • D149 Test Method: This test evaluates the dielectric breakdown voltage and strength of solid electrical insulating materials at commercial power frequencies, an essential factor in ensuring the safety and integrity of electrical guards. 
  • Test method applications 
Application  Test Method 
Material ratings for notched Izod Impact Strength  Test Methods D256 – Methos A 
Material ratings for water absorption  D570 
Material ratings for dielectric strength  D149 
Material ratings for flame retardancy  UL-94 
Handles of Grade 1 Guards  ASTM F711 


Rauckman’s Commitment to the ASTM F712 Standard 

At Rauckman, our plastic insulating guards are designed and manufactured with the ASTM F712 standard as a guiding standard. We understand the critical role that electrical insulating guards play in ensuring the safety of electrical installations.  

The ASTM F712 standard is more than a set of guidelines; it’s a blueprint for safety, efficiency, and reliability in electrical installations. Rauckman’s adherence to these standards reflects our dedication to providing the best in electrical safety and performance.