PEC – Is Voltage Drop Calculation Required?

There are provisions in the Philippine Electrical Code stating the maximum voltage drop for branch circuits and feeders.

Philippine Electrical Code Part 1/Chapter 2. Wiring and Protection/Article 2.10 - Branch Circuits

FPN No. 4: Conductors for branch circuits as defined in Article 1.0, sized to prevent a voltage drop exceeding 3 percent at the farthest outlet of power, heating, and lighting loads, or combinations of such loads, and where the maximum total voltage drop on both feeders and branch circuits to the farthest outlet does not exceed 5 percent, provide reasonable efficiency of operation. See FPN No. 2 of 2.15.1.2(a)(3) for voltage drop on feeder conductors.

Philippine Electrical Code Part 1/Chapter 2. Wiring and Protection/Article 2.15 - Feeders
FPN No. 2: Conductors for feeders as defined in Article 1.0, sized to prevent a voltage drop exceeding 3 percent at the farthest outlet of power, heating, and lighting loads, or combinations of such loads, and where the maximum total voltage drop on both feeders and branch circuits to the farthest outlet does not exceed 5 percent, will provide reasonable efficiency of operation.

In the Philippines, seldom do you see voltage drop calculations in electrical project documentations. What is the requirement of the Philippines Electrical Code for voltage drop calculations?

In Article 2.20 - Branch-Circuit, Feeder, And Service Calculations, Table 2.20.1.3 Additional Load Calculation References, states that voltage drop calculation is mandatory for

  1. Fire Pumps, Section 6.95.1.7
  2. Sensitive Electrical Equipment, Section 6.47.1.4(d)

With the above provisions, voltage drop calculation is optional for any other installations. If you are the electrical designer, how would you guaranty that the cable selections are suitable for the project. I will answer this in my next article.

About the Author

Ver Pangonilo
A Filipino Engineer, Registered Professional Engineer of Queensland (RPEQ) - Australia and Professional Electrical Engineer (PEE) - Philippines with extensive experience in concept select, front-end engineering, HV & LV detail design, construction and commissioning of Hazardous and Non-Hazardous Area electrical installations in water and waste water pipeline and pumping facilities, offshore platforms, hydrocarbon process plants and pipelines including related facilities. Hazardous area classification and design certification (UEENEEM015B, UEENEEM016B, UEENEEM017B).
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