MERALCO GUIDELINES ON SERVICE AVAILABILITY
Introduction
This is a general overview of the policies, standards and guidelines of Meralco’s
existing Service Availability within its franchise area, and includes the available
service voltages, limitations, and other relevant information. For the complete
standards including drawings and specifications, please contact our Technical
Support Engineers at your nearest Meralco Business Office.
Franchise Area
The franchise area of the Company covers all cities and municipalities of Metro Manila,
the entire provinces of Bulacan, Rizal and Cavite, parts of the provinces of Laguna,
Quezon and Batangas, and several barangays in Pampanga.
Alternating current at a nominal frequency of sixty hertz (60 Hz) is distributed throughout
the territory served by the Company. Normally, the electric power supply of an applicant
shall be served through an overhead distribution system. However if requested, an
underground distribution system may be used, upon compliance with certain Company
requirements.
Service Voltages
The following are the service voltages being maintained and offered by the Company in
its franchise area.
Low Voltage (Secondary Nominal Voltage)
• 230 Volts, Single Phase, Three(3)-Wire
• 230 Volts, Three(3) Phase, Four(4)-Wire
• 460/265 Volts, Three(3) Phase, Four(4)-Wire (Grounded Wye)
• 400Y/230-volt, three-phase, four-wire service voltage (New)
Medium Voltage (Primary Nominal Voltage)
• 13.2/7.62 kV, Three(3) Phase, Four(4)-Wire (Grounded Wye)
• 34.5/19.92 kV, Three(3) Phase, Four(4)-Wire (Grounded Wye)
High Voltage (Sub-Transmission Nominal Voltage)
• 115/66 kV, Three(3) Phase, Four(4:)-Wire (Grounded Wye)
Low Voltage (Secondary Voltage Service)
The maximum allowable demand load for single-phase service applications is
75 kW. Single-phase service applications with demand load requirement of more
than 75 kW shall be served at three-phase service instead.
The maximum Meralco-supplied transformer bank capacities are the following: 1000
kva at 230 volts ; 2000 kva at 460 volts ; 1000 kva at 400Y / 230 volts.
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Meralco made available to its customers the 400Y/230-volt, three-phase, four-wire
service voltage starting year-2006.
400Y / 230 volts service may be provided for the following types of loads: 1) Threephase solely-served industrial establishments, 2) Three-phase solely-served
commercial establishments, and 3) Purely residential buildings/condominiums served
solely by three-phase transformer bank/s.
However, this service shall be provided only in areas where the standard primary
distribution voltages of 34500Y/19920 volts and 13200Y/7620 volts are available.
The following transformers shall be used to provide 400Y/ 230-volt, three-phase, fourwire service depending on the applicant's/customer's capacity requirement and the
type of service applied for:
For pole-mounted distribution transformers, the maximum bank capacity is 300 kva.
In cases where the load requirement exceeds 300 kva, a transformer vault room shall
be provided within the customer’s premises for the use of dead-front vault-type
distribution transformers. The maximum transformer bank capacity for the vault-type
distribution transformers is 1000 kva.
For service applications in the network area (portions of Binondo, Sta. Cruz &
Quiapo), the applicant shall provide a transformer vault room (for installation of
Meralco’s pad-mounted transformer) within the building premises under any or both of
the following conditions:when the total connected load of the building is more than 40
kW or when the total building floor area is more than 280 square meters.
Medium Voltage (Primary Voltage Service)
Primary-metered service is typically provided whenever the applied load is greater
than Meralco’s transformer bank capacities at its available secondary voltages.
The predominant distribution system voltage is 34.5 kv, while the 13.2 kV primary
voltage is available only within the following areas: Maragondon, Silang, Tagaytay,
Alfonso, Amadeo, Mendez, Bailen, Magallanes, and Indang in Cavite Province.
Malolos, Paombong, Hagonoy, Calumpit, Plaridel, Pulilan, Baliuag, Bustos, San
Rafael, San Ildefonso, and San Miguel in Bulacan Province. Portions of Candaba and
Apalit in Pampanga Province. Pila and Sta Cruz in Laguna Province. San Pascual in
Batangas Province, and Batangas City.
Service applications with voltage disturbing loads such as arc furnace, large
motor loads, etc., shall be either required to install anti-flickering devices or be served
at sub-transmission voltage as determined by the Company.
The service shall be metered at the primary voltage side. The applicant shall provide,
install and maintain all electrical facilities after the metering point (i.e., transformers,
distribution facilities, main primary service protection, etc.).
High Voltage Service (Sub-Transmission Voltage Service)
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The high voltage service is provided by the Company under any of the following
conditions, 1) The applied load is 10,000 kW and above, 2) The service shall utilize
voltage disturbing loads such as arc furnace, large motor loads, etc., where the
operation of such equipment may cause the flickering of the distribution voltage,
as determined by the Company, 3) Other cases as established by the Company.
The service shall be metered at the primary voltage side, and the customer shall
provide space, as determined by the Company, for the installation of the necessary
metering facilities.
The applicant shall provide, install and maintain all electrical facilities after the
metering point (i.e., transformers, distribution facilities, main primary service
protection). The customer shall provide space, as determined by the Company, for the
installation of the necessary metering facilities.
“Sa Meralco, may liwanag ang buhay.”
END OF DOCUMENT
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