1. Introduction and Safety Information
This manual provides instructions for the safe installation, operation, and maintenance of the Siemens MM0202B1200 200-Amp Meter Main Combination. It is crucial to read and understand all instructions before proceeding with any work on this equipment.
WARNING: Risk of electric shock. Installation and servicing of this equipment must be performed by qualified personnel only. Always disconnect power at the source before working on or near the unit. Failure to follow these instructions can result in serious injury or death.
Always comply with all national and local electrical codes, as well as the requirements of your local utility company. Utility acceptance for metering products varies by region; verify acceptance before installation.
2. Product Overview
The Siemens MM0202B1200 is a 200-Amp Meter Main Combination unit designed for single-phase electrical service. It integrates a 200-Amp rated meter socket with a 200-Amp main breaker service disconnect. This unit is UL listed and suitable for outdoor applications.
Figure 2.1: Front view of the Siemens MM0202B1200 with the main breaker compartment open, revealing the meter socket on the left and the 200A main breaker on the right.
Figure 2.2: Front view of the Siemens MM0202B1200 with all covers closed, showing the compact design.
Figure 2.3: Internal components of the meter main combination, illustrating the wiring terminals and bus bar connections.
3. Setup and Installation
Installation of the Siemens MM0202B1200 must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and local regulations.
3.1 Pre-Installation Checks
- Verify that the unit specifications match the service requirements.
- Confirm acceptance by the local utility company.
- Inspect the unit for any shipping damage. Do not install damaged equipment.
3.2 Mounting
Mount the unit securely to a rigid, non-combustible surface. Ensure adequate clearance around the unit for ventilation, access, and future maintenance. The unit is designed for outdoor use.
Figure 3.1: Rear view of the unit, highlighting the mounting holes and various conduit knockout locations for flexible installation.
3.3 Wiring
- Ensure all power is disconnected before beginning wiring.
- Connect service entrance conductors to the appropriate terminals within the meter socket and main breaker.
- Connect the load conductors from the main breaker to the downstream electrical panel.
- Properly ground and bond the enclosure according to NEC and local codes.
- For overhead service, use appropriate RX type hubs as needed to maintain the outdoor rating and seal conduit entries.
4. Operating Instructions
The primary operational component for the user is the 200-Amp main breaker. This breaker serves as the primary service disconnect for the entire electrical system connected to it.
4.1 Turning Power ON
- Ensure all downstream circuit breakers are in the OFF position.
- Move the handle of the 200-Amp main breaker to the ON position.
- Gradually turn on downstream circuit breakers as needed.
4.2 Turning Power OFF
- It is recommended to turn off all downstream circuit breakers first, if practical.
- Move the handle of the 200-Amp main breaker to the OFF position. This will disconnect power to the entire connected electrical system.
CAUTION: Never attempt to hold the breaker handle in the ON position if it trips. This indicates an electrical fault that requires investigation by a qualified electrician.
5. Maintenance
Regular inspection and maintenance can help ensure the longevity and safe operation of your Siemens Meter Main Combination. All maintenance should be performed by qualified personnel.
5.1 Periodic Inspection
- Visually inspect the enclosure for signs of damage, corrosion, or water ingress.
- Check for loose connections or discolored wiring, which may indicate overheating.
- Ensure all covers and doors are securely latched and sealed.
- Keep the area around the unit clear of obstructions and debris.
5.2 Cleaning
If cleaning is necessary, ensure all power is disconnected. Use a dry, lint-free cloth to wipe down the exterior. Do not use abrasive cleaners or solvents.
6. Troubleshooting
This section addresses common issues. For any complex electrical problems, always contact a qualified electrician.
6.1 Main Breaker Trips Repeatedly
- Cause: Overload or short circuit in the electrical system.
- Action: Disconnect all loads. Attempt to reset the breaker. If it holds, reconnect loads one by one to identify the faulty circuit. If it trips immediately, there may be a short circuit. Contact an electrician.
6.2 No Power to Downstream Panel
- Cause: Main breaker is OFF or tripped.
- Action: Check the main breaker position. If OFF, attempt to turn ON. If tripped, refer to 'Main Breaker Trips Repeatedly' above.
- Cause: Issue with utility service.
- Action: Contact your local utility company to confirm service status.
7. Specifications
| Feature | Specification |
|---|---|
| Model Number | MM0202B1200 |
| Brand | SIEMENS |
| AC Adapter Current | 200 Amps |
| Phase Type | Single Phase |
| Number Of Circuits | 16 |
| Product Dimensions (L x W x H) | 18" x 6.5" x 17.5" |
| Item Weight | 26.6 pounds |
| Material | Copper |
| Environmental Rating | Outdoor Rated |
| Certifications | UL Listed |
8. Important Considerations
- Utility Acceptance: Always confirm with your local utility company that this specific meter main combination is approved for use in your service area before purchase and installation.
- Hubs: When required for overhead service or specific conduit installations, use appropriate RX type hubs to ensure proper sealing and compliance with electrical codes.
- Professional Installation: Due to the high voltage and current involved, installation by a certified electrician is mandatory to ensure safety and compliance.
9. Warranty and Support
For warranty information, please refer to the documentation provided with your product at the time of purchase or visit the official Siemens website. For technical support or inquiries, contact Siemens customer service directly.
