On this page: What the Work Involves · Start with the reason for more capacity · One service can have more than one distribution panel · Residential and commercial systems need different reviews · Details that help us plan your project · Common questions before booking
400-Amp Electrical Service Upgrades in Myrtle Beach, SC
Large homes, substantial electric equipment and growing businesses need a service plan built around demand, distribution and the utility—not a panel-size guess.
What the Work Involves
Assess demand and equipment
Review existing loads, service ratings and the condition of the panel or service equipment.
Plan the supply and interruption
Define equipment ratings, feeder routes and any utility-controlled disconnection before scheduling.
Confirm scope, permits and scheduling
We identify permit and inspection requirements for the property jurisdiction. Utility coordination is included when the work affects its equipment or supply. You receive the proposed scope before approving the work.
Complete the work and check operation
We complete the agreed electrical work, test the relevant installation and explain operation, findings and any follow-up. Required official inspections are a separate part of completion.
Start with the reason for more capacity
Multiple large electric loads, extensive additions or significant business equipment can justify a larger-service assessment. The useful question is what needs to operate together and what is planned later. A property size or appliance count alone is not a complete design. Guardian reviews the equipment and supply before comparing an upgrade with other workable options.
One service can have more than one distribution panel
Larger installations can distribute power through multiple disconnects and panels. Two panels labeled 200 amps do not, by themselves, establish a 400-amp supply. The upstream service, protection and connected-load design matter. Some equipment described as a 400-amp residential arrangement uses Class 320 metering; equipment ratings and utility acceptance must be checked for the actual configuration.
Residential and commercial systems need different reviews
A larger residential supply is not automatically three-phase power. Commercial equipment may need a specific voltage and phase, and the utility must confirm what is available at the address. Commercial distribution planning considers those requirements along with equipment loads, shutdowns and future expansion.
Utility coordination and construction affect the estimate
The project may need different meter equipment, service conductors, underground routes or utility infrastructure review. Space, access, easements and inspection sequencing can influence the work. Utility-owned equipment is handled through the utility or its authorized process. We identify that boundary rather than treating a transformer change as an ordinary customer-side electrical task.
Compare proposals by the complete scope: equipment, connections, permit coordination, testing, interruptions and restoration. A larger-service project deserves a site assessment and written plan; it cannot be accurately priced from an amperage label alone.
Details that help us plan your project
- Existing service or distribution drawings, if available
- Current and planned large electrical loads
- Utility provider and the buildings or areas being supplied
- Property contact and equipment affected by a shutdown
Common questions before booking
Is 400 amps always better than 200 amps?
No. A suitable existing service, load management or different equipment selections may meet the goal. An oversized project can add cost without addressing the real issue.
Can you confirm utility capacity from a photo?
No. Photographs help establish the existing arrangement, but utility review and an electrical assessment are needed to confirm the proposed supply.
Can I get more electrical capacity just by putting in a bigger panel?
A larger panel does not by itself increase the capacity of the incoming electrical service. The utility supply, meter equipment, conductors and protective devices must support the proposed arrangement. Main service lugs, the terminals where incoming power connects, may remain live with the main breaker off; keep covers closed.
Will the power need to be turned off while this electrical work is done?
The required power interruption depends on the equipment and scope. We identify affected circuits, safe isolation arrangements and any utility-controlled disconnection before scheduling. Tell us about medical equipment, refrigeration and occupied business operations.
How are the quote and diagnostic charges handled?
Guardian offers free quotes for planned projects. A fault-finding visit or service call can involve a diagnostic charge, explained before booking. Access, equipment requirements and the work identified determine the proposed repair or installation scope.
Related services for the next step
Repair & troubleshooting
What does the repair assessment cover?
For an existing larger service, share the equipment information and affected building areas. The diagnostic scope considers service equipment, distribution and coordination with the utility where its supply or equipment may be involved.
Could replacement or specialist service be needed?
Larger-service equipment can supply several panels or building areas, so the fault location and shutdown effects must be established before work is planned. Utility-side corrections, branch-circuit changes and additional capacity are separate decisions; replacing one component is not proof that all distribution equipment has been reviewed.
Plan fault assessment around the distribution arrangement
Share available electrical drawings, equipment information and which panels or building areas are affected. A problem at one downstream circuit is different from a concern affecting several distribution points. Explain critical operations before a shutdown is discussed.
Guardian agrees the accessible assessment and identifies the necessary property, utility or equipment-provider coordination. Additional distribution changes and increased capacity should be separately defined rather than assumed to accompany replacement of one component.
Larger residential service and future loads
A request for 400-amp service should include the intended loads and actual equipment arrangement. A large home, multiple EV chargers, electric heating or a workshop can create different design needs; the home’s appearance does not establish the required service rating.
Guardian reviews the load information, service equipment, distribution and utility coordination before proposing the electrical work. Supply changes can affect meter equipment, disconnects, feeders and subpanels. Equipment availability, approvals and the utility process determine scheduling; a larger service is not an automatic remedy for a faulty branch circuit.
Questions about this electrical work
Is 400-amp service required for every luxury home?
No. The electrical demand and proposed equipment determine the appropriate service arrangement.
Can two EV chargers justify a larger service?
Their actual charging requirements and available load-management options must be reviewed with the home’s other loads.
Planning Your Service Visit
Share the property address, the problem or project you have in mind, and equipment details when available. Photos of accessible equipment and the work area can help us plan the next step. Do not remove electrical covers or expose wiring to take photographs.
Guardian Electrical Contractors LLC is based in Myrtle Beach and serves Horry and Georgetown counties. SC CLM.119159 · Insured and bonded · Veteran-owned.
Project quotes are free. Diagnostic and service-call charges are explained before booking. Electrical service is available 24/7; call to confirm availability and scheduling.
Planning your local electrical project
For service work in Myrtle Beach, North Myrtle Beach or Georgetown, send the full address and utility provider shown on your bill. The property and supply arrangement determine the relevant coordination; a mailing city alone is not enough.
Guardian serves Myrtle Beach, Conway, Carolina Forest and communities across Horry and Georgetown counties. See how quotes and diagnostic visits work, our credentials and project planning guides before arranging the next step.
Where to request this service
Guardian is based in Myrtle Beach and accepts electrical enquiries across Horry County and Georgetown County. Provide the project address so scope, travel and scheduling can be confirmed.
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