1. Introduction
This manual provides essential instructions for the proper installation, operation, and maintenance of the Appleton EYS-3 Sealing Fitting. This fitting is designed to prevent the passage of gases, vapors, or flames from one portion of a conduit system to another in hazardous locations. Adherence to these instructions is crucial for safe and effective performance.
2. Safety Information
WARNING: Installation and maintenance of this product must be performed by qualified personnel only, in accordance with all applicable national and local electrical codes, including the National Electrical Code (NEC) and the Canadian Electrical Code (CEC).
- Always de-energize the electrical system before installing or servicing the fitting.
- Ensure the fitting is suitable for the specific hazardous location classification.
- Use only approved sealing compounds and fiber dams as specified by Appleton for explosion-proof applications.
- Improper installation can lead to serious injury, property damage, or explosion.
- Do not modify the fitting in any way.
3. Product Description and Features
The Appleton EYS-3 Sealing Fitting is a robust, explosion-proof conduit fitting constructed from malleable iron. It is engineered for use in hazardous locations where the prevention of gas, vapor, or flame propagation through conduit systems is critical. The fitting features 1-inch Female National Pipe Taper (FNPT) ends for secure connection to conduit.
Figure 1: Appleton EYS-3 Sealing Fitting. This image displays the grey malleable iron fitting, highlighting its threaded ends and the square-headed plug used to access the sealing chamber. The fitting is designed for both vertical and horizontal conduit installations.
Key Features:
- Material: Malleable Iron for durability and corrosion resistance.
- Trade Size: 1 inch, compatible with standard conduit systems.
- Hazardous Location Rating:
- Class I, Division 1 and 2, Groups A, B, C, D
- Class II, Division 1 and 2, Groups E, F, G
- Class III
- Function: Prevents passage of gases, vapors, or flames.
- Orientation: Suitable for both vertical and horizontal conduit runs.
4. Setup and Installation
Proper installation is critical for the explosion-proof integrity of the conduit system. Refer to Appleton's specific instructions for the sealing compound and fiber dam used with this fitting.
- Preparation:
- Ensure all conduit ends are clean, free of burrs, and properly threaded.
- Verify that the sealing fitting is the correct size and type for the application.
- Conduit Connection:
- Thread the EYS-3 fitting onto the conduit ends. Ensure a minimum of five full threads are engaged for a secure, explosion-proof connection.
- Tighten connections firmly using appropriate tools to achieve a rigid and electrically continuous system.
- Fiber Dam Installation:
- Insert the fiber dam into the sealing chamber of the fitting. The dam should be packed firmly against the conduit wires to prevent the sealing compound from flowing into the conduit.
- Ensure the fiber dam completely fills the cross-sectional area of the conduit.
- Sealing Compound Application:
- Prepare the sealing compound according to the manufacturer's instructions (e.g., mixing time, consistency).
- Pour or pack the sealing compound into the fitting's sealing chamber through the access plug opening.
- Ensure the compound completely fills the chamber and encapsulates the fiber dam and wires, forming a solid, void-free seal.
- Allow the sealing compound to cure fully as per manufacturer's specifications before energizing the system.
- Plug Installation:
- Once the sealing compound has cured, replace and tighten the square-headed access plug securely.
Note: The EYS-3 fitting is designed for both vertical and horizontal conduit orientations. The sealing process remains consistent regardless of orientation.
5. Operating Principles
Once properly installed and sealed, the Appleton EYS-3 fitting functions as a barrier within the conduit system. Its primary purpose is to:
- Prevent Flame Propagation: In the event of an internal explosion within a hazardous area, the solid sealing compound prevents flames or hot gases from traveling through the conduit to other areas, thus containing the explosion.
- Isolate Hazardous Gases/Vapors: The seal acts as a barrier to prevent the migration of flammable gases or vapors through the conduit system, maintaining the integrity of hazardous area classifications.
The fitting itself does not have moving parts or active operational controls. Its "operation" is its passive function as a safety barrier.
6. Maintenance
Regular inspection of the Appleton EYS-3 Sealing Fitting is recommended to ensure its continued integrity and safety.
- Visual Inspection: Periodically inspect the fitting for any signs of physical damage, corrosion, or loose connections.
- Sealing Plug: Ensure the square-headed access plug is securely tightened.
- Environmental Factors: Check for any signs of environmental stress that could compromise the fitting's integrity.
- Damage: If any damage is observed, the fitting should be de-energized, inspected by qualified personnel, and replaced if its explosion-proof integrity is compromised.
No internal maintenance of the sealing compound is typically required after proper installation and curing, unless the system is modified or damage occurs.
7. Troubleshooting
As a passive component, troubleshooting for the EYS-3 fitting primarily relates to installation issues or compromised integrity.
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| Visible cracks or damage to fitting body. | Physical impact, excessive stress, or material defect. | De-energize system. Replace fitting immediately. |
| Loose conduit connections. | Improper tightening during installation, vibration. | De-energize system. Re-tighten connections to specified torque. Inspect for damage. |
| Sealing compound leaking or not fully cured. | Improper mixing, insufficient curing time, or incorrect fiber dam installation. | De-energize system. Remove old compound. Re-install fiber dam and apply new sealing compound according to manufacturer's instructions. Ensure proper curing. |
| Corrosion on fitting surface. | Exposure to harsh chemicals or environment without adequate protection. | Clean and inspect. If corrosion is superficial, monitor. If structural integrity is compromised, de-energize and replace. Consider additional protective coatings if environment is severe. |
8. Specifications
- Model: EYS-3
- Brand: Appleton
- Type: Sealing Fitting
- Material: Malleable Iron
- Trade Size: 1 inch
- Ends: 1 inch FNPT x 1 inch FNPT
- Overall Length: 4 5/16 inches
- Exterior Finish: Sandblast
- Compatible Conduit Types: IMC (Intermediate Metal Conduit), RMC (Rigid Metal Conduit)
- Hazardous Location Ratings:
- Class I, Division 1 and 2, Groups A, B, C, D
- Class II, Division 1 and 2, Groups E, F, G
- Class III
- Orientation: Vertical and Horizontal
9. Warranty and Support
For specific warranty information regarding the Appleton EYS-3 Sealing Fitting, please refer to the official Appleton website or contact Appleton customer service directly. Warranty terms typically cover manufacturing defects under normal use and service.
For technical support, installation guidance, or inquiries about compatible sealing compounds, please contact Appleton's authorized distributors or technical support team. Always provide the model number (EYS-3) when seeking support.
