Categorise every electrical load (lighting, cooking, HVAC, motors) into groups as per standard tables (e.g., Table C1 or C2 in AS/NZS 3000). Determine Connected Load Calculate the full current for each circuit, often using for fixed loads. Apply Diversity
You cannot simply add up the ratings of every circuit breaker in a building. If you did, a standard home might seem to require 150A, even though the main fuse is only 60A or 100A. This discrepancy is resolved through .
After calculating the diversified peak kVA load, engineers select a transformer that meets the peak load demand within the established maximum allowable overload factor. maximum demand calculation
To calculate demand accurately, you must understand four fundamental electrical engineering metrics: 1. Connected Load
The highest power load utilization operating concurrently within a specific time interval (typically 15 to 30 minutes). It is always lower than the total connected load. 3. Demand Factor If you did, a standard home might seem
2. Applying Diversity Calculations (Standard Code Reference) Load Group Connected Load Diversity Rule Applied Calculated Demand 75% of connected load 900 W (3.9 A) Power Outlets 20 Sockets 10 A for first + 5 A for next 15 A (3,450 W) Air Conditioning 100% of largest + 50% of secondary 4,500 W (19.5 A) 3. Final Aggregation Total Diversified Power : Total Amperage at 230V :
kVA at 0.9 PF = 210 kVA → 250 kVA transformer. To calculate demand accurately, you must understand four
Several subtleties often trip up practitioners. First, : A single consumer’s MD is non-coincident (their own highest interval). But the utility’s system peak is coincident—when all consumers happen to be high simultaneously. A consumer who shifts load away from the system peak reduces both their own MD and the utility’s stress.
Contact us by phone to request more information:
