1. Introduction
The Intermatic PX300S Safety Transformer is engineered to provide a reliable 12-14 VAC power supply for various low-voltage lighting applications, including pool and spa lights, submersible fixtures, and outdoor garden lights. Its robust design features a painted brown stainless steel enclosure for oxidation resistance and a grounded shield between primary and secondary windings to ensure safe operation. Built-in circuit protection temporarily disconnects power in case of an overload, enhancing safety. This transformer complies with NEC Code 680.23 requirements for underwater luminaries.
Figure 1: Front view of the Intermatic PX300S 300W Pool Light Transformer.
2. Important Safety Information
Always adhere to local electrical codes and regulations. Installation should only be performed by qualified personnel. Disconnect power before servicing. This product is designed for safety with a grounded shield and circuit protection. Do not bypass any safety features.
- Ensure proper grounding to prevent electrical shock.
- Do not overload the transformer beyond its rated 300W capacity.
- Keep the enclosure securely closed to protect internal components from environmental factors.
- Comply with NEC Code 680.23 for underwater luminaries.
- WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
3. Product Features
- Versatile Lighting Supply: Provides 12V, 13V, and 14V AC output for various low-voltage lighting needs.
- Superior Safety: Features a grounded shield between primary and secondary windings and built-in circuit protection against overloads.
- Durable Construction: Housed in a 3R Brown Stainless Steel enclosure with 10 combination knockouts, designed to resist oxidation.
- Compact Design: Dimensions of 7.25” (H) x 5.25” (W) x 4.5” (D) for efficient space utilization.
- NEC Code Compliant: Meets NEC Code 680.23 requirements for underwater luminaries.
Figure 2: Internal features and construction highlights of a similar Intermatic transformer model (PX100S shown, features apply to PX300S).
Figure 3: Internal wiring and components of the Intermatic PX300S transformer.
4. Setup and Installation
The Intermatic PX300S transformer is designed for surface mounting. Ensure the mounting location is secure, dry, and allows for proper ventilation. All wiring must comply with national and local electrical codes.
4.1 Mounting
- Select a suitable mounting surface that can support the weight of the transformer (approximately 10.4 lbs).
- Mount the transformer at least 12 inches (30 cm) above ground level.
- Use appropriate fasteners to secure the transformer to the wall or mounting surface via the pre-drilled holes at the top and bottom of the enclosure.
4.2 Wiring Connections
The transformer features 10 combination knockouts for wiring entry. Ensure all connections are tight and secure.
- Input (Primary) Wiring: Connect the 120 VAC, 60 Hz power supply to the designated input terminals.
- Output (Secondary) Wiring: Connect your low-voltage lighting fixtures to the output terminals. The PX300S offers 12V, 13V, and 14V output options. Select the appropriate voltage tap based on your lighting requirements and cable run length to ensure optimal light performance.
- Grounding: Properly ground the transformer enclosure as per electrical codes.
5. Operation
Once properly installed and wired, the Intermatic PX300S transformer operates automatically. It converts standard 120 VAC household current to a safe low voltage (12-14 VAC) suitable for pool/spa and landscape lighting.
- The built-in circuit protection will automatically disconnect power if an overload occurs. This is a safety feature to protect the transformer and connected fixtures.
- After an overload, the internal protector will open. Allow approximately 15 minutes for the unit to cool and reset before attempting to restore power. Identify and correct the cause of the overload before re-energizing.
6. Maintenance
The Intermatic PX300S transformer is designed for minimal maintenance. Regular inspection can help ensure long-term performance.
- Periodically inspect the enclosure for any signs of damage, corrosion, or loose connections.
- Keep the area around the transformer clear of debris to ensure proper ventilation.
- Clean the exterior of the unit with a soft, damp cloth as needed. Do not use abrasive cleaners or solvents.
- Ensure the lid is securely fastened at all times to maintain its rainproof integrity.
7. Troubleshooting
If your Intermatic PX300S transformer is not functioning as expected, refer to the following common issues and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No power output to lights | Overload detected by internal protector | Disconnect power, wait 15 minutes for reset. Reduce load or fix short circuit. |
| Lights are dim | Incorrect voltage tap selected or long cable run causing voltage drop | Verify correct voltage tap (12V, 13V, 14V) for your setup. Consider using a higher voltage tap or thicker gauge wire for longer runs. |
| Transformer humming loudly | Normal operation (slight hum) or loose mounting/components | A slight hum is normal. Ensure the transformer is securely mounted. Check for any loose internal components (qualified personnel only). |
| Enclosure shows signs of rust/corrosion | Exposure to harsh elements or damaged paint | While designed to resist oxidation, extreme conditions can affect it. Clean and apply rust-inhibiting paint if necessary. Ensure lid is sealed. |
If troubleshooting steps do not resolve the issue, contact a qualified electrician or Intermatic customer support.
8. Technical Specifications
| Specification | Detail |
|---|---|
| Model Number | PX300S |
| Input Voltage | 120 VAC, 60 Hz |
| Output Voltage | 12 VAC, 13 VAC, 14 VAC |
| Maximum Output Power | 300 Watts |
| Enclosure Material | Painted Brown Stainless Steel (3R) |
| Dimensions (H x W x D) | 7.25" x 5.25" x 4.5" |
| Item Weight | 10.4 lbs |
| Compliance | NEC Code 680.23 |
| UPC | 078275067578 |
9. Warranty and Support
The Intermatic PX300S transformer comes with a 1-year warranty from the date of purchase, covering defects in material and workmanship. For warranty claims or technical support, please contact Intermatic customer service.
Extended protection plans may be available from third-party providers. Please refer to your purchase documentation for details on additional protection options.
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