Capacity of secondary distribution box in El Salvador

Secondary distribution boxes in El Salvador typically range from 60 A to 200 A, depending on residential or commercial load requirements.

Overview

Secondary distribution boxes, also known as residential or commercial service panels, are the interface between the medium-voltage distribution network and the end-user electrical installation. In El Salvador, electricity is distributed primarily at 13.8 kV or 34.5 kV in medium-voltage lines, which are stepped down via transformers to 120/240 V single-phase or 208/120 V three-phase for end users .

Typical Capacities

• Residential installations: Most homes are supplied through secondary distribution boxes rated 60 A to 100 A, sufficient for standard household appliances, lighting, and small air conditioning units .
• Small commercial or light industrial installations: These often require 100 A to 200 A panels to accommodate higher loads, including multiple HVAC units, commercial kitchen equipment, or small machinery .
• Voltage and phase: Residential boxes are usually single-phase 120/240 V, while commercial boxes may be three-phase 208/120 V to support heavier loads.

Regulatory and Network Context

The General Superintendence of Electricity and Telecommunications (SIGET) regulates distribution standards, while companies like AES El Salvador are modernizing the network, including secondary distribution infrastructure, smart meters, and underground lines . These upgrades ensure that secondary distribution boxes can safely handle the expected load and comply with national electrical codes.

Practical Considerations

• Load calculation: The capacity of a secondary distribution box should be selected based on the total connected load and future expansion.
• Safety margins: Panels are typically rated 25–30% above expected peak load to prevent overloads.
• Upgrades: In urban areas, modernization projects may include higher-capacity boxes to support electric vehicle charging or increased residential consumption . In summary, while residential secondary distribution boxes in El Salvador generally range from 60 A to 100 A, commercial or industrial applications may require up to 200 A, with voltage and phase configurations determined by the type of installation and local distribution standards .