Understanding Electrical Loads
Electrical loads are categorized by their power consumption and usage patterns.
- Continuous Loads Operate for 3+ hours, require 125% circuit capacity.
- Non-continuous Loads Intermittent operation, standard circuit capacity.
- Motor Loads Special considerations for starting current.
- Resistive Loads Unity power factor, simpler calculations.
Circuit Planning
Voltage Drop
Keep within 3% for branch circuits, 5% total including feeder.
Circuit Protection
Size breakers according to NEC requirements and load type.
Wire Sizing
Consider ampacity, voltage drop, and ambient conditions.
Load Balance
Distribute loads evenly across phases in three-phase systems.
Safety Considerations
- Code Compliance Follow NEC and local electrical codes.
- Grounding Proper grounding essential for safety.
- Overcurrent Protection Properly sized circuit breakers and fuses.
- Professional Installation Licensed electrician for complex systems.