A facility’s Service Entrance Section (SES) is the front door of its electrical power system where utility power enters the site and is distributed to critical equipment and downstream systems. When the SES is undersized, aging, damaged, or no longer aligned with operational demand, SES upgrades become essential for safety, reliability, and future growth.
At Bunney’s Inc., we support Service Entrance Section (SES) upgrade projects with disciplined industrial construction execution, heavy handling support, and outage coordination helping facilities complete upgrades safely while minimizing downtime.
What Is a Service Entrance Section (SES)?
The Service Entrance Section (SES) is typically the portion of an electrical system that includes the main service disconnecting means and associated gear at the point where electrical service enters a building or facility. It often interfaces with:
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Main switchgear or service disconnects
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Metering and protective devices
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Bus systems and feeders
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Grounding/bonding infrastructure
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Connections feeding distribution panels and critical loads
Because it’s a critical junction, the SES must be properly sized, protected, and maintained to support safe operation.
Why SES Upgrades Are Needed
Facilities upgrade their SES for several common reasons:
1) Increased Load Demand
Expansion projects, new production lines, and added large equipment often require higher capacity and upgraded distribution.
2) Aging or Obsolete Equipment
Older service entrance gear can become difficult to maintain due to discontinued parts, reduced reliability, and outdated protection features.
3) Safety and Compliance Improvements
SES upgrades can address concerns related to arc flash risk, inadequate protection, poor physical condition, or outdated configuration.
4) Voltage Requirement Changes
If a facility changes voltage standards (for example, moving to a higher voltage distribution strategy), the SES may require modification to support the transition.
5) Reliability and Downtime Reduction
Unplanned interruptions at the service entrance can shut down entire operations. Upgrading the SES improves system resilience and helps prevent costly outages.
What’s Included in Service Entrance Section (SES) Upgrade Projects
SES upgrades vary by facility design, but commonly include:
1) Replacement or Modernization of Service Gear
This may include replacing service entrance switchgear or upgrading associated sections to improve capacity and protective performance.
2) Structural and Space Modifications
Upgraded SES equipment can require changes to:
- Equipment pads or housekeeping foundations
- Structural supports and mounting points
- Room layout, access, and clearance improvements
3) Feeder and Conduit Changes
SES upgrades often require changes to feeder routing, supports, or cable pathways to match new gear configurations.
4) Grounding and Bonding Improvements
Grounding performance is critical at the service entrance. Upgrade projects may include new grounding connections, bonding updates, and site grounding improvements depending on engineering requirements.
5) Outage Planning and Cutover Execution
Most SES upgrades require a controlled shutdown window to remove old gear and energize new equipment safely.
Outage success depends on:
- Tight scheduling and sequence control
- Safety-first permitting and controlled work zones
- Efficient mobilization and installation execution
How Bunney’s Inc. Supports SES Upgrade Projects
SES upgrades often involve heavy, sensitive equipment and strict safety requirements especially when performed in operating facilities. Bunney’s Inc. supports these projects with the jobsite-ready capabilities needed to keep work controlled and on schedule.
Our support capabilities include:
- Industrial construction services for infrastructure modification and installation support
- Heavy lifting and rigging for service gear handling and setting
- Precision equipment positioning for accurate placement and fit-up
- Outage support services for shutdown scheduling and cutover execution
- Safety-first execution aligned with facility and utility requirements
Benefits of Upgrading Your SES
A properly executed SES upgrade can deliver:
- Increased service capacity to support growth
- Improved reliability and fewer disruptions
- Enhanced safety with better protection and modern configurations
- Easier maintenance and improved long-term supportability
- Better readiness for future expansions and load additions
Best Practices for a Successful SES Upgrade
To reduce risk and downtime, facilities often prioritize:
- Early planning and outage scheduling to protect critical operations
- Accurate equipment handling and placement to avoid fit-up issues
- Clear safety controls and disciplined work execution
- Coordination across trades (civil, structural, electrical, operations)
- Commissioning readiness to prevent post-cutover failures
Conclusion: Upgrade Your Service Entrance with Confidence Contact Bunney’s Inc.
Service Entrance Section (SES) upgrades are a high-impact investment in facility reliability, safety, and future capacity. With proper planning and experienced field execution, SES upgrades can be completed efficiently even within tight shutdown windows.
If you’re planning a Service Entrance Section (SES) upgrade, contact Bunney’s Inc. today. We’ll help you support your project with safe, schedule-driven construction execution and dependable field capabilities.
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