SINGLE LINE DIAGRAM M 2-80mm2 THHN/THWN CU. WIRE 1-22mm² TW (GRD WIRE) IN 54mm RSC PB-1 PB-2 125AT, 2P, 230V GOAT M PB1 PB2 ΤΟ ELECTRIC METER 2-8.0 mm², THHN GROUND FLOOR MAIN PANEL BOARD MAIN BREAKER 125 AT CB, 2 POLE 30 SQ MM 54 MM CU THHN PVC CONDUIT TO MAIN PANEL BOARD 8.0 mm², THHN SECOND FLOOR PANEL BOARD-1 MAIN BREAKER 60 AT CB, 2 POLE 8 SQ MM CU THHN PVC CONDUIT 25 MM LAUNDRY WP KITCHEN WP REFRIGERATOR CD 15 AMP 20 AMP MASTER BEDROOM 20 AMP 20 AMP MARPORT WE TMTWP TO MAIN PANEL BOARD 18.0 mm, THHN THIRD FLOOR PANEL BOARD - 2 MAIN BREAKER 60 AT CB, 2 POLE 8 SQ MM 25 MM CU THHN PVC CONDUIT MASTER TAB WP MASTER TAB 2WP MASTER BEDROома 20 AMP 20 AMP TMB2W.P TAB 3 WP LIVING AREA LOUNGE AREA 15 AMP 15 AMP TV CABLE S KITCHEN LO TABLO BEDROOM 1 20 AMP 20 AMP BEDROOM 2 ACU 20 AMP 20 AMP ACU TV CABLE SET DINING AREA LO FRONTYARD L MASTER BEDROOM CARPORT LO 15 AMP 60 AMP SECOND FLOOR 20 AMP 15 AMP STAIRS LO MASTERAR LLO MASTER TABLO BEDROOM1CO LIVING AREALD THIRD FLOOR 2-80mm² THHN CU. WIRE 1-22mm² TW Cu. WIRE (G) IN 54mm RSC 125AT, 2P, 230V PANEL BOARD! GOAT PANEL BOARD 2 SPARE MASTER BEDROOM 2 BEDROOM CO 20 AMP 15 AMP STAIRS LO MASTERE MASTER TABLO TABLO OUTDOOR CRING AMP SPARE BALCONY 1 LO BEDROOM L 15 AMP AMP SPARE LOUNGE AREA IL BALCONY 1 LO BEDROOM LO LOUNGE AREA 1L 15 AMP 15 AMP LO TOTAL AMPERES = 91.99 A IP (91.99 x 100%)+(25% x 8) -93.99 A FEEDER CURRENT = 93.99 x 125% = 117.49 A FOR OVERCURRENT DEVICE TOTAL AMPERES = 32.6 A IP (32.6 x 100%)+(25% x 8) = 34.6 A FEEDER CURRENT - 34.6 x 125% 43.25 A FOR OVERCURRENT DEVICE HIGHEST CIRCUIT BREAKER RATING = 60 A HIGHEST MOTOR FL CURRENT SUM OF REMAINING CURRENT 8.00 = 8.00 A HIGHEST CIRCUIT BREAKER RATING - 20 A HIGHEST MOTOR FL CURRENT = 8.00 A = 91.99 - SUM OF REMAINING CURRENT = 32.6-8.00 = 24.6 A TOTAL AMPERES = 37.82 A IP = (37.82 x 100% ) + ( 25 % x 8) = 39.82 A FEEDER CURRENT -39.82 x 125% = 49.78 A FOR OVERCURRENT DEVICE HIGHEST CIRCUIT BREAKER RATING HIGHEST MOTOR FL CURRENT SUM OF REMAINING CURRENT 20 A = 8.00 A = 37.82 - 8.00 - 29.82 A = 83.99 A APPLY DEMAND FACTOR = 24.6 x 125% APPLY DEMAND FACTOR = 83.99 = 30.75 A APPLY DEMAND FACTOR 125% = 29.82 x x 125% -37.28 A = 104.99 A 1 PANEL BOARD MANAGEMENT From the lighting and power plans (estimated from the example images): Ground Floor 1. Ceiling Lights: 4 fixtures 。 Assumed Wattage (each): 10 W (LED) 。 Total: 2. Wall Lamps: 3 fixtures 。 Assumed Wattage (each): 15 W (LED) 。 Total: 3. Convenience Outlets: 6 outlets 。 Assumed Wattage (each): 180 W 。 Total: 4. Refrigerator Outlet: 1 outlet 。 Assumed Wattage: 150 W ° Total: 5. Range Outlet: 1 outlet 。 Assumed Wattage: 1000 W 。 Total: Ground Floor Total Load (Watts): ☑ 40+45 + 1080 + 150 + 1000 = 2315 \text{ W} \ Second Floor 1. Ceiling Lights: 5 fixtures 。 Assumed Wattage (each): 10 W 。 Total: 2. Wall Lamps: 2 fixtures 。 Assumed Wattage (each): 15 W ° Total: 3. Convenience Outlets: 4 outlets 。 Assumed Wattage (each): 180 W ° Total: Second Floor Total Load (Watts): ☑ 50+30 720 = 800 \text{ W} } Third Floor 1. Ceiling Lights: 3 fixtures 。 Assumed Wattage (each): 10 W 。 Total: 2. Wall Lamp: 1 fixture 。 Assumed Wattage: 15 W 。 Total: 3. Convenience Outlets: 2 outlets 。 Assumed Wattage (each): 180 W 。 Total: 4. Waterproof Outlet (e.g., balcony/ garden): 1 outlet 。 Assumed Wattage: 100 W 。 Total: Third Floor Total Load (Watts): ☑ 30+15+ 360 + 100 = 505 \text{ W} 2. Convert Wattage to Amperage Using the formula: . • = Current in amperes = Power in watts = Voltage (assume 220 V) Per Floor Current 1. Ground Floor Current 1. Second Floor Current 1. Third Floor Current 1. Total Connected Current (Amperes) 1. Demand Factor Residential circuits often use a demand factor of around 80% to account for the fact that not all loads run simultaneously at full capacity. 4. Breaker Sizing per Floor When grouping circuits, ensure that each breaker is loaded to no more than 80% of its rating to avoid nuisance tripping. Ground Floor • Load: 10.52 A • A 15A breaker is suitable. At 80% loading, a 15A breaker can handle about 12A. Since 10.52A < 12A, it's within the safe limit. Second Floor • Load: 3.64 A • This is a relatively small load. A 10A breaker or 15A breaker would be sufficient. Typically, you might combine small circuits or leave them on a separate breaker if code or design preferences require separation. Third Floor • Load: 2.30 A • Similarly small load. A 10A breaker would be sufficient. 5. Main Breaker and Feeder Sizing 1. Main Breaker 。 Calculated demand load is ~13.17A. 。 A 20A main breaker is a practical choice, giving a safe margin above 13.17A and leaving room for minor future expansions. 2. Feeder Cable 。 Must safely carry the main breaker rating (20A). • Common practice: ► 2.5 mm² copper for up to 20A over moderate distances. ▸ 4.0 mm² copper if the distance is long or if local codes require a larger gauge for voltage drop or future-proofing. 6. Example Panel Board Schedule Below is a simplified example of how you might arrange the panel board: Circui Descr Break Estim Rema t No. iption er 1 Grou nd Floor ated rks Size Load (A) 15A 10.52 Keep withi n Light 80% of S/ Outle ts 15A 2 Seco 10A 3.64 Could nd comb Floor Light ine with S/ Third Outle Floor ts if desir ed 3 Third Floor 10A 2.30 Low load Light S/ Outle ts Main Break er 20A 13.17 Cover (dem S and) total dema nd load Note: In many real projects, you might have separate circuits for heavy loads. (e.g., dedicated range circuit, air conditioning units, etc.), or more granular lighting/outlet circuits to comply with local electrical codes. 7. Key Points and Explanation 1. Why Apply a Demand Factor? In residential design, it's rare that all lights and appliances operate simultaneously at peak. Thus, a demand factor (often 70-80% for typical residences) is applied to avoid oversizing. 2. Why Keep Each Breaker at 80% Loading? Circuit breakers are designed to handle their full rated current, but continuous loads (running over 3 hours) must not exceed 80% of the breaker rating per most electrical codes (e.g., NEC in the US). This ensures safety and reliability. 3. Breaker Sizing vs. Wire Sizing 。 Breaker rating protects the circuit wire from overheating. 。 Wire gauge is chosen to match or exceed the breaker rating. 。 If you have long wire runs, you may upsize to reduce voltage drop. 4. Local Code Requirements Always cross-check with your local electrical code (NEC, IEC, PEC, etc.) for exact rules on circuit loading, branch circuit grouping, wire sizing, grounding, GFCI/AFCI requirements, and breaker selection. Final Summary 1. Total Estimated Load: ~3620 W (16.46 A at 220V). 2. After 80% Demand Factor: ~13.17 A. 3. Recommended Main Breaker: 20A. 4. Branch Circuits: • Ground Floor: 15A breaker (~10.5A load) • Second Floor: 10A breaker (~3.6A load) o Third Floor: 10A breaker (~2.3A load)