As industries across the Philippines continue to expand and modernize, the demand for reliable electrical infrastructure is greater than before. Medium voltage (MV) systems play a crucial role in this landscape, serving as the backbone for power distribution in manufacturing facilities, commercial complexes, and industrial operations nationwide. At GEMCOR, we deliver medium voltage switchgear that meets national standards and quality requirements, backed by reliable and responsive after-sales service.
What is Medium Voltage?
Medium voltage refers to electrical systems operating between 1 kV (1,000 volts) and 100 kV according to ANSI C84.1 standards, though the National Electrical Code (NEC) and Philippine Electrical Code (PEC) define MV equipment as 1,000 V and higher. In the Philippines, common MV distribution voltages include 13.8 kV and 34.5 kV for utility distribution, with industrial facilities often receiving power at these levels before stepping down to usable voltages. These systems bridge the gap between the low-voltage distribution (below 1 kV) used in offices and homes, and the high-voltage transmission lines (69 kV and above) that transport power across regions.
Why Philippine Industries Choose Medium Voltage
MV systems deliver distinct advantages that make them ideal for industrial and commercial applications. By transmitting power at higher voltages, these systems significantly reduce energy losses during distribution. For example, a manufacturing plant receiving 13.8 kV power experiences far less resistive loss in its conductors compared to distributing the same power at low voltage levels. This translates directly to lower operational costs and improved energy efficiency.
Space efficiency is another critical factor, particularly in dense industrial areas and Metro Manila’s commercial districts. MV equipment is substantially more compact than equivalent low-voltage systems, requiring less valuable floor space while handling the same power capacity. For facility managers facing space constraints, this efficiency can make the difference in project feasibility.
Key Components of MV Systems
Medium Voltage Switchgear
GEMCOR’s medium voltage switchgear serves as the nerve center of industrial power distribution. Our switchgear assemblies integrate circuit breakers, disconnect switches, protection relays, and control systems into a unified, safe, and reliable package. Engineered to Philippine Electrical Code standards published by the Institute of Integrated Electrical Engineers of the Philippines (IIEE) and designed for tropical conditions, GEMCOR switchgear protects equipment, enables safe maintenance isolation, and provides the control needed for complex industrial operations.
Vacuum Circuit Breaker (VCB) Type
GEMCOR offers Vacuum Circuit Breaker–type switchgear, designed to interrupt fault currents and protect electrical systems from overloads and short circuits. VCBs provide fast, reliable switching with minimal maintenance, making them ideal for critical industrial and commercial applications where system protection and continuity are essential.
Scope: Supply and Installation of a 36KV Vacuum circuit breaker in the existing feeder of MVSG Panel located at Calamba, Laguna.
Load Break Switch (LBS) Type
We also offer Load Break Switch–type switchgear, primarily used for switching and isolating circuits under normal load conditions. LBS units offer a cost-effective and dependable solution for sectionalizing power systems, allowing safe operational control by offering a quick-make and quick-break feature, and isolation of the operating personnel via gear handles and shafting.
Scope: Supply and Delivery of Load Break Switch, including Very Low Frequency Testing, and Insulation Resistance Test
Distribution Transformers
Power distribution transformers step MV levels down to the 480V, 220V, or other voltages required by equipment and building systems. In Philippine applications, transformers must withstand high humidity, temperature fluctuations, and occasional power quality issues. Whether pad-mounted for outdoor installations at manufacturing sites or dry-type units for indoor commercial buildings, selecting and protecting the transformer is essential for system reliability.
Supply and Delivery of 3000kVA Padmounted Transformer, inclusive of Site Acceptance Test (Conduct of Instrumentation Testing)
Cables and Bus Systems
MV cable systems require specialized insulation materials to safely contain elevated voltages. Cross-linked polyethylene (XLPE) and ethylene propylene rubber (EPR) insulated cables are standard choices, selected for their durability in tropical environments. Proper termination techniques and periodic testing ensure these critical connections maintain integrity over decades of service.For facilities with concentrated power requirements, bus duct systems offer an alternative to cables, providing rigid, well-ventilated conductors that can be easily modified as facility needs evolve.
Installation of Substation Feeder Cable
for an industrial project in Bataan.
Supply & Installation of Busway for a Commercial
Project located in Quezon City.
Protection and Control Systems
Modern MV systems incorporate sophisticated protection relays that continuously monitor voltage, current, frequency, and other parameters. When abnormalities occur—whether from equipment faults, ground faults, or overloads—these systems respond in milliseconds to isolate affected areas while maintaining power to unaffected portions of the facility.
GEMCOR integrates advanced digital protection into our switchgear designs, providing not only rapid fault clearing but also comprehensive event recording and diagnostic capabilities. These features help maintenance teams identify problems quickly and prevent future issues.
Testing and Commissioning of a Synchronizing Panel at Plaridel, Misamis Occidental, including verification of electrical terminations, functional testing of protection and control circuits, and validation of synchronization logic between generator sets..
Applications Across Philippine Industries
Data Centers and Telecommunications
The explosive growth of digital infrastructure in the Philippines has created demand for highly reliable MV systems. Data centers and telecommunications facilities operated by companies like Dito Telecommunity require dual-fed MV switchgear with automatic transfer capabilities to ensure uninterrupted service. Even milliseconds of downtime can have significant consequences in these mission-critical environments.
Manufacturing and Production Facilities
From automotive plants to food processing operations, Philippine manufacturers depend on MV systems to power production lines, large motors, HVAC systems, and process equipment. Companies like Honda, Petron, and other GEMCOR clients rely on robust MV distribution to maintain continuous operations. Any power interruption in these facilities can result in significant production losses, making reliability paramount.
Commercial and Mixed-Use Developments
Shopping centers, office towers, and mixed-use developments require substantial electrical capacity. MV distribution allows developers to efficiently serve multiple buildings from a central substation, providing the flexibility needed as tenant requirements change over time.
Industrial Complexes and Special Economic Zones
Philippine economic zones house diverse industries with varying power needs. MV distribution networks within these complexes provide the flexibility to serve different tenants efficiently while maintaining the high reliability standards required by export-oriented manufacturers.
Safety Standards and Best Practices
Working with medium voltage demands unwavering attention to safety. The Philippine Electrical Code, which is based on the U.S. National Electrical Code (NEC) but adapted for local conditions, provides minimum standards for MV installations. Specifically, PEC Article 4.90.2.4 addresses medium-voltage clearancing requirements for live parts, ensuring safe working distances and installation practices. The PEC is published and updated by the IIEE in collaboration with the Board of Electrical Engineering and is mandated under Republic Act 7920 (New Electrical Engineering Law). Industry best practices also reference NFPA 70E: Standard for Electrical Safety in the Workplace, which addresses arc flash hazards and protective equipment requirements for energized electrical work.
Qualified electrical workers must receive specialized training in MV systems before operating or maintaining this equipment. Arc flash hazards at MV levels can be fatal, with arc temperatures reaching 35,000°F (19,400°C). This requires proper arc-rated personal protective equipment, adherence to safe approach distances, and strict lockout/tagout procedures. Our switchgear designs incorporate safety interlocks and features that help prevent unsafe operations.
Regular maintenance performed by trained personnel is essential. This includes thermographic inspections to detect developing hot spots, insulation resistance testing, breaker operation verification, and protection relay testing. GEMCOR provides comprehensive documentation and support to help facility managers establish effective maintenance programs.
The GEMCOR Advantage: Quality Manufacturing for Philippine Conditions
Since 2011, GEMCOR has been engineering electrical equipment specifically for Philippine industrial applications. Our ISO 9001:2015 certified quality management system ensures that every medium voltage switchgear assembly we produce meets stringent standards for performance and reliability.
We understand the unique challenges of operating electrical systems in tropical conditions—high humidity, temperature extremes, corrosive coastal environments, and occasional power quality issues. Our designs account for these factors, utilizing appropriate materials, coatings, and component selections that ensure long-term reliability.
Our Caloocan City facility houses modern manufacturing equipment and skilled technicians who take pride in delivering world-class engineered electrical products. From initial design consultation through fabrication, testing, and installation support, GEMCOR provides comprehensive service throughout the project lifecycle.
Maintenance and Long-Term Reliability
Medium voltage systems represent significant investments that must deliver decades of reliable service. Proactive maintenance programs help ensure this outcome by identifying potential issues before they cause failures. Key maintenance activities include:
Visual inspections detect signs of overheating, contamination, corrosion, and mechanical wear. These should be performed quarterly or semi-annually, depending on environmental conditions and system loading.
Infrared thermography identifies hot spots indicating loose connections, overloaded components, or deteriorating equipment. Annual thermal imaging surveys are recommended for critical systems.
Protective relay testing verifies that protection systems will respond appropriately to fault conditions. This testing should occur every 2-3 years or after any significant system modifications.
Insulation resistance testing measures the condition of cable insulation and equipment windings, helping predict potential breakdown before it occurs.
Circuit breaker maintenance includes operation verification, contact inspection, and mechanism lubrication according to manufacturer recommendations.
GEMCOR provides ongoing technical support to help clients maintain their switchgear systems effectively. Our team can assist with maintenance planning, provide replacement parts, and offer testing services to keep your MV systems operating reliably.
Making the Right Choice for Your Facility
Selecting medium voltage equipment requires careful consideration of current needs, future growth, and operational requirements. At GEMCOR, we work closely with consulting engineers, electrical contractors, and facility owners to design solutions that meet specific project requirements.
Our experience serving leading Philippine companies across diverse industries gives us unique insight into what works in real-world applications. We don’t just manufacture equipment; we partner with our clients to deliver electrical infrastructure that supports their business objectives.
Moving Forward with Confidence
As the Philippines continues its industrial development and infrastructure modernization, reliable medium voltage systems will remain essential to this growth. Whether you’re planning a new facility, upgrading existing electrical infrastructure, or simply seeking to better understand your power distribution system, GEMCOR stands ready to provide the expertise and quality products you need.
Our mission is to “Give Extra Mile” in contributing to the advancement of the Philippine industry, and this commitment drives everything we do—from design and manufacturing to customer support and service.
References and Further Reading
Philippine Standards and Organizations:
- Institute of Integrated Electrical Engineers of the Philippines (IIEE) – Official PEC publisher and accredited professional organization
- Philippine Electrical Code Information – Comprehensive PEC primer
- Department of Energy Philippines – Energy policies and grid standards
- Philippine Grid Code – Standards for high-voltage transmission systems
- Bureau of Philippine Standards (BPS) – Product certification and standards development
