EPLAN Electrical Panels Builder Examples
A collection of practical examples and case studies demonstrating the application of EPLAN P8 for electrical panel builders, including real-world scenarios, design considerations, and best practices for panel layout, component selection, and documentation.
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EPLAN Electrical Panels Explained
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24 min read
EPLAN Electrical Panels Builder Examples
EPLAN P8 for Electrical Panel Builders: Installation Site vs Location Designation
Real-World Panel Builder Scenarios
SCENARIO 1: Multi-Panel Industrial Control System
Project: Automotive Manufacturing Plant
Installation Site (++): Main Assembly Plant Building 3
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++ Main Assembly Plant Building 3
+ Welding Station 1 - Control Cabinet (MCC-W1)
├─ Main Motor Starter (75 kW)
├─ Safety Relay Module
├─ PLC Controller
└─ Emergency Stop Circuit
+ Welding Station 2 - Control Cabinet (MCC-W2)
├─ Main Motor Starter (75 kW)
├─ Cooling Fan Controller
└─ Pressure Monitoring
+ Assembly Line 1 - Power Distribution Panel (PDP-A1)
├─ Incoming 63A Breaker
├─ 4× 32A Branch Breakers
└─ RCD Protection 300mA
+ Assembly Line 2 - Power Distribution Panel (PDP-A2)
├─ Incoming 63A Breaker
├─ 4× 32A Branch Breakers
└─ RCD Protection 300mA
+ Electrical Room B3-301 - Main MCC Panel
├─ Main 250A Breaker
├─ Transformer Secondary Disconnector
├─ Load Sharing Module
└─ Power Factor Correction
+ Quality Control Room - Testing Panel (QC-TEST)
├─ Safety Interlock
├─ Test Circuit 1-6 (30A each)
└─ Data Logger Interface
EPLAN P8 Designations Generated
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++Main Assembly Plant Building 3 + Welding Station 1 = Motor Starter 75kW & Schematic
++Main Assembly Plant Building 3 + Welding Station 1 = Safety Relay Module & Schematic
++Main Assembly Plant Building 3 + Assembly Line 1 = Main Breaker 63A & Single Line
++Main Assembly Plant Building 3 + Electrical Room B3-301 = MCC Distribution & Technical Data
Panel Builder Data Sheet Format
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PROJECT: Automotive Assembly Line - Building 3
PANEL DESIGNATION: ++Main Assembly Plant Building 3
LOCATION-BY-LOCATION BREAKDOWN:
┌─────────────────────────────────────────────────────────────────┐
│ LOCATION: Welding Station 1 - Control Cabinet (MCC-W1) │
├─────────────────────────────────────────────────────────────────┤
│ Cabinet Size: 2000×800×600 mm │
│ Main Supply: 3Ph 400V, 63A, TN-S │
│ Load: 75 kW + auxiliary circuits │
│ Component Count: │
│ - Main Contactor: 1× AF96 (75kW @ 400V) │
│ - Overload Relay: 1× NZM100 (63A setting) │
│ - Aux Relay: 1× CR420 (dual channel safety) │
│ - E-Stop: 1× AC23Z (mushroom head) │
│ - Terminal Blocks: 80-pin arrangement │
│ Wiring Gauge: 16mm² (main), 2.5mm² (control) │
│ Assembly Time: 16 hours │
│ Test Point: TP1, TP2, TP3 (voltage, current, earth) │
└─────────────────────────────────────────────────────────────────┘
┌─────────────────────────────────────────────────────────────────┐
│ LOCATION: Assembly Line 1 - Power Distribution Panel (PDP-A1) │
├─────────────────────────────────────────────────────────────────┤
│ Cabinet Size: 1200×800×400 mm │
│ Main Supply: 3Ph 400V, 63A, TN-S │
│ Branch Circuits: 4 × 32A (industrial sockets) │
│ Component Count: │
│ - Main Breaker: 1× C63 (63A curve) │
│ - Branch Breakers: 4× C32 (32A curve) │
│ - RCD Module: 1× A300/30 (dual channel) │
│ - DIN Rail: 90 mm × 3 sections │
│ - Cable Glands: 6 (metric M25, M20) │
│ Assembly Time: 8 hours │
│ Field Installation: Wall-mounted, 1.5m height │
└─────────────────────────────────────────────────────────────────┘
┌─────────────────────────────────────────────────────────────────┐
│ LOCATION: Electrical Room B3-301 - Main MCC Panel │
├─────────────────────────────────────────────────────────────────┤
│ Cabinet Size: 2400×1200×800 mm (floor-standing) │
│ Main Supply: 3Ph 400V, 250A (from transformer secondary) │
│ Total Outgoing: 6 × 125A circuits │
│ Load: 350 kW continuous + transient surges │
│ Component Count: │
│ - Main Disconnect: 1× OT250D3 (250A isolator) │
│ - Main Breaker: 1× NM250H (250A selective) │
│ - Outgoing MCBs: 6× NM125H (125A each) │
│ - Transformer Secondary: 1× disconnect switch │
│ - Busbar: 160A × 3 sections (copper, 10mm²) │
│ - PFC Capacitor: 1× 25 kVAr (400V) │
│ - Temperature Monitor: 1× TMD23 (earth fault) │
│ Assembly Time: 24 hours │
│ Testing: 3-phase voltage check, insulation test (500V DC) │
└─────────────────────────────────────────────────────────────────┘
SCENARIO 2: Food & Beverage Processing Plant
Project: Bottling Line with Multiple Control Zones
Installation Site (++): Processing Plant South Wing
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++ Processing Plant South Wing
+ Filling Machine Area - Motor Control Cabinet (MCC-FM)
├─ Main Pump Motor (45 kW, IE3)
├─ Secondary Pump Motor (22 kW, IE3)
├─ Conveyor Drive (11 kW)
├─ Temperature Controller
├─ Pressure Transducer Interface
└─ Emergency Stop Interlocks
+ Labeling Station - Control Panel (CP-LABEL)
├─ Labeling Motor (7.5 kW)
├─ Pneumatic Solenoid Valves (6 circuits)
├─ Vision System Interface (24VDC)
└─ Barcode Scanner Connection
+ Capping & Sealing - Combined Panel (CP-CAP-SEAL)
├─ Capping Motor (5.5 kW)
├─ Sealing Motor (3 kW)
├─ Heater Controller (9 kW resistive)
└─ Position Sensors
+ Quality Control Inspection - Testing Panel (QC-INS)
├─ Optical Scanner PSU
├─ Weight Checker PSU
├─ Data Logger (24VDC powered)
└─ Reject Gate Solenoid
+ Packaging Area - Power Distribution (PDP-PKG)
├─ Main Supply 125A
├─ 6× Branch Circuits 32A (to packaging machines)
├─ Pneumatic Compressor Contactor (15 kW)
└─ Compressed Air Dryer (3 kW)
+ Cleanroom Interface - Isolation Transformer Panel (ISO-CLEAN)
├─ Isolation Transformer 63 kVA (1:1)
├─ Equipotential Bonding
└─ 4× Segregated Circuits to clean area
+ Utility Room SR-101 - Transformer & Distribution
├─ Main Transformer 250 kVA (20kV/400V)
├─ Primary Switching (HV)
├─ Secondary Distribution (250A)
└─ Metering & Monitoring Module
Panel Builder Electrical Analysis
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INSTALLATION SITE: Processing Plant South Wing
TOTAL CONNECTED LOAD: 168.5 kW
DEMAND FACTOR: 0.75 (simultaneous operation unlikely)
DESIGN LOAD: 126.4 kW
REQUIRED SUPPLY: 250A @ 400V TN-S
LOCATION-BY-LOCATION LOAD BREAKDOWN:
┌──────────────────────────────────────────────────────────┐
│ LOCATION: Filling Machine Area (MCC-FM) │
├──────────────────────────────────────────────────────────┤
│ Connected Load: 45 + 22 + 11 = 78 kW │
│ Diversity Factor: 0.85 (motors rarely run simultaneously)│
│ Demand Load: 66.3 kW │
│ Current @ 400V: I = 66300/(1.73×400×0.92) = 104.2A │
│ Supply Circuit Breaker: 125A (Type C) │
│ Cable: 4×25mm² + 25mm² PE (voltage drop: 2.1%) │
│ Installation Distance: 85m from main panel │
│ Feeder Conduit: φ50mm PVC (underground) │
│ Soft Starter Required: YES (45 kW motor, soft start) │
│ VFD Required: NO (fixed speed operations) │
│ Harmonic Filters: YES (IE3 motors) │
└──────────────────────────────────────────────────────────┘
┌──────────────────────────────────────────────────────────┐
│ LOCATION: Labeling Station (CP-LABEL) │
├──────────────────────────────────────────────────────────┤
│ Connected Load: 7.5 + 0.5 (solenoids) = 8 kW │
│ Demand Load: 8 kW (rarely simultaneous) │
│ Current @ 400V: I = 8000/(1.73×400×0.95) = 12.2A │
│ Supply Circuit Breaker: 32A (Type C) │
│ Cable: 4×4mm² + 4mm² PE (voltage drop: 1.8%) │
│ Installation Distance: 35m from main panel │
│ 24VDC Auxiliary PSU: 480W (integrated) │
│ UPS Backup Required: NO │
└──────────────────────────────────────────────────────────┘
┌──────────────────────────────────────────────────────────┐
│ LOCATION: Capping & Sealing (CP-CAP-SEAL) │
├──────────────────────────────────────────────────────────┤
│ Connected Load: 5.5 + 3 + 9 = 17.5 kW │
│ Demand Load: 15.75 kW │
│ Current @ 400V: I = 15750/(1.73×400×0.93) = 24.4A │
│ Supply Circuit Breaker: 32A (Type B - shorter delay) │
│ Cable: 4×6mm² + 6mm² PE (voltage drop: 2.3%) │
│ Installation Distance: 42m from main panel │
│ Special: Heater inrush monitored (9 kW resistive) │
│ Contactor: AF38 dual main contactors │
└──────────────────────────────────────────────────────────┘
TOTAL SITE DEMAND: 126.4 kW → 250A Supply Adequate ✓
SPARE CAPACITY: ~25% for future expansion
SUPPLY TRANSFORMER: 250 kVA (typical for this load)
Cable Routing Diagram (Electrical Engineering Data)
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Main Transformer (Utility Room SR-101)
↓ (250A, 3Ph 400V TN-S)
├→ [Main MCC @ Electrical Room]
│
├→ [MCC-FM @ Filling Machine] (125A, 85m, 4×25mm²+PE)
│ ├─ Motor M1: 45 kW (soft start, contactor AF96)
│ ├─ Motor M2: 22 kW (direct, contactor AF45)
│ └─ Motor M3: 11 kW (direct, contactor AF30)
│
├→ [CP-LABEL @ Labeling Station] (32A, 35m, 4×4mm²+PE)
│ ├─ Motor M4: 7.5 kW (direct)
│ └─ 24VDC PSU: 480W (for solenoids & vision)
│
├→ [CP-CAP-SEAL] (32A, 42m, 4×6mm²+PE)
│ ├─ Motor M5: 5.5 kW (direct)
│ ├─ Motor M6: 3 kW (direct)
│ └─ Heater: 9 kW resistive (dual contactors AF38)
│
├→ [QC-INS @ Quality Control] (16A, 28m, 4×2.5mm²+PE)
│ └─ All 24VDC PSU powered (optical scanner, weight check)
│
└→ [PDP-PKG @ Packaging] (63A, 52m, 4×16mm²+PE)
├─ Branch 1-6: 32A each (to packaging machines)
├─ Compressor: 15 kW (contactor AF46)
└─ Air Dryer: 3 kW (direct)
TOTAL CABLE LENGTHS: ~282m of armored cable required
CONDUIT SYSTEM: φ50mm main, φ32mm branches
EARTHING: PME supplementary bonding at each panel location
SCENARIO 3: Data Center Power Distribution
Project: Enterprise Data Center Facility
Installation Site (++): Data Center Building West
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++ Data Center Building West
+ Server Room W-101 (Ground Floor) - PDU Bank 1
├─ Main Disconnect 250A
├─ 4× 63A Branch PDUs (each powers 24 rack units)
├─ Monitoring & Control Module
└─ Emergency Shutdown Station
+ Server Room W-102 (Ground Floor) - PDU Bank 2
├─ Main Disconnect 250A
├─ 4× 63A Branch PDUs
├─ Temperature & Humidity Monitoring
└─ Access Control Interface
+ Server Room W-201 (First Floor) - PDU Bank 3
├─ Main Disconnect 200A
├─ 3× 63A Branch PDUs
└─ Network Tap Integration
+ Cooling Plant Room - Chiller & Pump Control
├─ Main Chiller Motor (45 kW, frequency controlled)
├─ Backup Chiller Motor (45 kW standby)
├─ Circulation Pumps (2× 11 kW)
├─ Temperature Sensor Interface (RTD/PT100)
└─ Alarm & Shutdown Logic
+ UPS Battery Room - DC Distribution & Charging
├─ Main Battery Charger (24V, 2000A capable)
├─ Battery String Monitoring (cell-level voltage)
├─ DC-DC Converters (multiple redundant)
└─ System Monitoring & Logging
+ Main Electrical Room - Utility Interface & Metering
├─ Transformer Secondary Disconnect (HV isolation)
├─ Main Metering Cabinet (revenue grade)
├─ Power Distribution Unit (PDU) main
├─ RCD & Surge Protection Module
└─ Remote Monitoring Interface (SNMP/Modbus)
+ Generator Room - Backup Power System
├─ Diesel Generator Controller (400 kVA)
├─ Automatic Transfer Switch (ATS) 630A
├─ Fuel Level & Temperature Monitoring
└─ Load Shedding Relay Logic
+ Security & Monitoring Room - Control Systems
├─ Access Control PSU (24VDC, 10A)
├─ CCTV System PSU (24VAC)
├─ Fire Alarm Panel Interface
└─ Environmental Monitoring (24VDC)
Critical Electrical Data for Panel Builder
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INSTALLATION SITE: Data Center Building West
TOTAL INSTALLED CAPACITY: 1,600 kVA (transformer sized)
TYPICAL LOAD: 800 kW (50% utilization baseline)
PEAK LOAD: 1,200 kW (80% utilization maximum)
DESIGN REDUNDANCY: N+1 (dual supply feeders from utility)
LOCATION POWER BUDGETS:
┌──────────────────────────────────────────────────────────┐
│ LOCATION: Server Room W-101 (PDU Bank 1) │
├──────────────────────────────────────────────────────────┤
│ Capacity: 4 × 63A circuits = 252A @ 400V = 174.5 kW │
│ Current Usage: ~120 kW (69% utilization) │
│ Monitored Power: Yes (metered at each PDU) │
│ Redundancy: Dual-fed from separate MPD main breakers │
│ Current @ rated load: 252A (split across 4 circuits) │
│ Cable: 4 × (4×25mm² + 25mm² PE) per PDU │
│ Conditioning: Isolation transformer fed (backup power) │
│ Next Expansion: Can upgrade to 315A (4×63A+spare) │
└──────────────────────────────────────────────────────────┘
┌──────────────────────────────────────────────────────────┐
│ LOCATION: Cooling Plant Room │
├──────────────────────────────────────────────────────────┤
│ Connected Load: 45 + 45 + 11 + 11 = 112 kW │
│ Demand Load: 90 kW (chiller + 1 pump running) │
│ Current @ 400V: I = 90000/(1.73×400×0.92) = 141A │
│ Supply Breaker: 160A (selective curve C) │
│ Cable: 4×35mm² + 35mm² PE (voltage drop: 1.2% @ 250m) │
│ VFD Required: YES (main chiller, 45 kW, variable load) │
│ Soft Starter: NO (fixed backup chiller) │
│ Motor Thermistors: All motors fitted (protection) │
│ Special: Synchronous start between primary & backup │
│ Load-Sharing: Intelligent control (HVAC system) │
└──────────────────────────────────────────────────────────┘
┌──────────────────────────────────────────────────────────┐
│ LOCATION: Main Electrical Room (Central MPD) │
├──────────────────────────────────────────────────────────┤
│ Incoming Supply: Dual 400A feeders from transformer │
│ Main Metering: Revenue-grade (±0.5% accuracy) │
│ Total Switchboard Capacity: 630A main bus │
│ Outgoing Circuits: │
│ - W-101 PDU: 250A (direct feeder) │
│ - W-102 PDU: 250A (direct feeder) │
│ - W-201 PDU: 200A (direct feeder) │
│ - Cooling: 160A (direct feeder) │
│ - Generator ATS: 630A (direct feeder) │
│ - UPS Charger: 125A (direct feeder) │
│ - Security: 32A (direct feeder) │
│ Total Switchboard Capacity: 630A (suitable at N+1 config)|
│ Protection: Selective coordination (TCC curves matching) │
│ Harmonic Filtering: Yes (VFD at cooling) │
│ Surge Protection: Type 1 (building entry) + Type 2 (PDU) │
│ Monitoring: Powermon 6000 (SNMP/Modbus/DNP3) │
│ Component List (Switchboard): │
│ - Main Disconnect: 1× OT630D3 (630A isolator) │
│ - Main Breaker: 1× NM630N (630A, selective) │
│ - Metering Module: 1× MT600 (3-phase 600A) │
│ - Outgoing MCBs: 8 × NM250-400H (250-400A range) │
│ - RCD Module: 1× MA300 (300mA dual channel) │
│ - Busbar: 400A × 4 vertical sections (copper) │
│ - Terminal Blocks: 160-pin industrial grade │
│ - Condition Monitoring: Thermal camera ports │
│ Assembly Size: 2400×2000×1000 mm (floor-standing) │
│ Assembly Time: 48 hours (critical infrastructure) │
└──────────────────────────────────────────────────────────┘
┌──────────────────────────────────────────────────────────┐
│ LOCATION: Generator Room (Backup Power) │
├──────────────────────────────────────────────────────────┤
│ Generator Size: 400 kVA (standby), 1500 rpm │
│ Fuel Type: Diesel (on-site storage) │
│ Current @ full load: 400000/692 = 578A @ 400V 3Ph │
│ ATS (Automatic Transfer Switch): 630A │
│ ATS Type: STS-6300 (make-before-break, 3-phase) │
│ Transfer Time: <100ms (UPS bridge load) │
│ ATS Contactors: 2× AF900 (dual-source changeover) │
│ Utility Feed Disconnect: Main ATS isolation │
│ Generator Control Panel: │
│ - Engine Controller (AMF module) │
│ - Frequency Monitor: 48-52 Hz acceptable │
│ - Voltage Monitor: 380-420V acceptable │
│ - Load Shedding Logic: 4-tier (non-critical first) │
│ - Fuel Level Indicator & Gauge │
│ - Oil Temperature & Pressure Monitoring │
│ - Exhaust Temperature Monitor │
│ Fuel Supply: 5000L on-site (16-hour runtime @ 75% load) │
│ Emission: Meets Stage 3B regulations │
│ Testing: Monthly test-run (30 min no-load) │
│ Documentation: Full maintenance log required │
└──────────────────────────────────────────────────────────┘
LOAD PROFILE (24-HOUR):
Time Load Supply Notes
06:00 600 kW Grid Morning startup
09:00 900 kW Grid + UPS Peak business hours
12:00 800 kW Grid Steady-state
18:00 950 kW Grid Evening peak
22:00 500 kW Grid Off-peak reduced
00:00 350 kW Grid Maintenance window
REDUNDANCY VERIFICATION:
✓ Dual feeder system (N+1 for main supply)
✓ Generator backup (8-hour autonomy with fuel load)
✓ UPS system (15-minute battery bridge)
✓ Cooling redundancy (dual chillers, one primary + one standby)
✓ PDU redundancy (each rack has dual-corded PSUs)
SCENARIO 4: Chemical Plant Process Control
Project: Reactant Dosing & Temperature Control System
Installation Site (++): Chemical Plant Building C (East Wing)
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++ Chemical Plant Building C (East Wing)
+ Reactor Control Room 1 - Main Process Panel (CP-REACT-1)
├─ Reactor Heater Circuit 1 (36 kW resistive)
├─ Reactor Heater Circuit 2 (36 kW resistive)
├─ Chiller Motor (22 kW)
├─ Agitator Motor (15 kW)
├─ Dosing Pump Motor (7.5 kW)
├─ Temperature Sensor Interface (PT100 RTD)
├─ Pressure Transducer Circuit (4-20mA)
└─ Safety Interlocks & E-Stop
+ Reactor Control Room 2 - Process Panel (CP-REACT-2)
├─ Reactor Heater Circuit 1 (36 kW resistive)
├─ Reactor Heater Circuit 2 (36 kW resistive)
├─ Chiller Motor (22 kW)
├─ Agitator Motor (15 kW)
├─ Dosing Pump Motor (7.5 kW)
└─ Control Interface & Monitoring
+ Auxiliary Equipment Room - Support Panel (SP-AUX)
├─ Vacuum Pump Motor (11 kW)
├─ Inert Gas Supply Compressor (7.5 kW)
├─ Ventilation Exhaust Fan (5.5 kW)
├─ Fume Hood Supply Fan (3 kW)
└─ Chemical Supply Chiller (5.5 kW)
+ Utility Room C-201 - Main MCC & Distribution
├─ Main Transformer Secondary 400A
├─ Main Distribution Breaker
├─ Outgoing Breakers (to each control area)
├─ Harmonic Filter Module (THD control)
└─ Power Quality Monitor
Electrical Load & Cable Sizing Analysis
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INSTALLATION SITE: Chemical Plant Building C (East Wing)
TOTAL PROCESS LOAD: 246 kW
DUTY CYCLE: Continuous (24/5 operation)
DESIGN SAFETY MARGIN: 25%
REQUIRED SUPPLY: 315A @ 400V TN-S
LOCATION 1: Reactor Control Room 1 (CP-REACT-1)
────────────────────────────────────────────────
Connected Load: (36+36+22+15+7.5) = 116.5 kW
Diversified Load: 110 kW (heaters 100%, motors 75%)
Current Required: I = 110000/(1.73×400×0.92) = 172A
Supply Breaker: 200A (Curve D for inrush resistance)
Cable Specification: 4×35mm² + 35mm² PE
Distance from Main: 120m (underground conduit)
Voltage Drop Calc: Vd = (2×L×I×R)/1000 = 2×120×172×0.00163/1000 = 0.067V = 0.016% ✓
[Note: 35mm² Cu = 0.00163 Ω/m]
Installation Method: 4-core armored cable in buried conduit φ50mm
Earth Fault Loop: Tested <0.5Ω (measured at site)
Protection: Bi-metal thermal overload + MCB discrimination curve
Temperature Compensation: Heater thermostat ±2°C accuracy
HEATER CIRCUITS (Critical Load Segment):
├─ Heater 1: 36 kW @ 400V = 52A → CB C63 (3-pole)
├─ Heater 2: 36 kW @ 400V = 52A → CB C63 (3-pole)
├─ Cable: 2×6mm² per heater (single phase distributed)
├─ Control: Contactor AF45 + thermal overload NZM45
├─ Contactor coil: 24VDC (from dedicated PSU)
└─ Interlock: Safety relay prevents both heaters ON simultaneously
MOTOR CIRCUITS:
├─ Chiller Motor 22kW: CB C32, Cable 4×10mm²+PE, DOL starting
├─ Agitator Motor 15kW: CB C32, Cable 4×6mm²+PE, DOL starting
├─ Dosing Pump 7.5kW: CB C20, Cable 4×4mm²+PE, DOL starting
MONITORING CIRCUITS (Instrumentation):
├─ PT100 Temperature Sensor: 3-wire, 1.5mm² shielded pair
│ Signal Range: -20 to +150°C (RTD output)
│ Transmitter: DIN-rail mounted, 4-20mA output
│ Cable: Armored shielded pair (EMI immunity)
│ Distance: 35m to sensor (compensation wiring)
│
├─ Pressure Transducer: 0-10 bar → 4-20mA output
│ Mounting: Vessel flange-mounted (IP67 connector)
│ Signal Conditioning: Isolator module (galvanic isolation)
│ Cable: 2-conductor 0.75mm² shielded (50m run)
│
└─ E-Stop Circuit: 24VDC dual-channel safety relay
Safety Rating: PNEU SIL2 Category 3
Relay Type: CR420 (redundant contacts)
Response Time: <10ms
LOCATION 2: Reactor Control Room 2 (CP-REACT-2)
────────────────────────────────────────────────
Configuration: IDENTICAL to CP-REACT-1
Connected Load: 116.5 kW (parallel installation)
Supply Breaker: 200A (independent feed)
Cable: Separate 4×35mm² run (parallel to Reactor 1)
Distance from Main: 115m (separate underground route)
Cross-connection: None (safety-critical separation)
LOCATION 3: Auxiliary Equipment Room (SP-AUX)
────────────────────────────────────────────────
Connected Load: (11+7.5+5.5+3+5.5) = 32.5 kW
Diversified Load: 30 kW (motors 75%, fan 100%, chiller 100%)
Current Required: I = 30000/(1.73×400×0.92) = 47A
Supply Breaker: 63A (Curve C, general purpose)
Cable: 4×10mm² + 10mm² PE
Distance from Main: 85m
Voltage Drop: 0.041V = 0.010% ✓
Installation: Above-ground conduit (machine room area)
Motors: All DOL starting (low-inertia machines)
Fans: Soft-start recommended (reduce stress on building ventilation)
LOCATION 4: Main Utility Room (MCC @ Utility C-201)
────────────────────────────────────────────────────
Incoming Supply: 400A dual feeders from 630kVA transformer
Main Distribution Architecture:
┌─────────────────────────────────────┐
│ Main Transformer Secondary 630kVA │
│ 20kV:400V, 1000A nominal │
└──────────────────┬──────────────────┘
↓
┌──────────────────────┐
│ HV Disconnect (OT80)│ ← 20kV side isolation
│ LV Main Breaker NM1000 (1000A)
└──────────────────────┘
↓
┌──────────────┼──────────────┐
↓ ↓ ↓
[CB-1] [CB-2] [CB-3]
315A Feed [Harmonic [Metering]
to Reactor Filter]
Room 1
↓ ↓ ↓
[CP-REACT-1] [THD <5%] [kWh Meter]
↓ Protection [Power Analyzer]
[200A Outlet]
MAIN SWITCHBOARD COMPONENTS:
├─ Main Isolator: OT630D3 (630A knife switch, HV side)
├─ Main Breaker: NM630H (630A, selective curve)
├─ Metering: MD500 (3-phase, 600A capacity)
├─ Outgoing MCBs:
│ ├─ CB1: NM315H (315A) → CP-REACT-1
│ ├─ CB2: NM315H (315A) → CP-REACT-2
│ ├─ CB3: NM100H (100A) → SP-AUX
│ ├─ CB4: NM63H (63A) → Utility Loads
│ └─ Spare: 2 breakers available
├─ RCD Protection: MA300 (300mA, dual channel)
├─ Harmonic Filter: FLW-25-7-400 (25 kVAr, 7th harmonic)
├─ Power Quality Monitor: Powermon 8000 (web interface)
└─ Busbar: 400A copper × 4 compartments
HARMONIC MITIGATION (Critical):
┌────────────────────────────────────┐
│ THD Source Analysis: │
│ ├─ Heater coils: Minimal (resistive)│
│ ├─ Motors (DOL): 20-30% THD │
│ ├─ Motor soft-starters: 40% THD │
│ └─ Cumulative @ 200A: ~25% THD │
└────────────────────────────────────┘
Mitigation: Fixed harmonic filter (25 kVAr, tuned to 7th harmonic)
Result: THD reduced to <5% (compliance with EN 61000-2-2)
Benefit: Reduced cable heating, longer equipment life
PROTECTION COORDINATION:
Time (ms) Event Action
0 Short circuit occurs All breakers see fault current
1-5 Instantaneous zone Main breaker sees 400A+, trips instantly
5-50 Short delay zone Outgoing breakers see current surge
50-100 Long delay zone Thermal overload elements activate
>100 Thermal overload Motor protection operates (12-16s @ 130%)
TCC (Time-Current Curves) verified for:
✓ Main breaker faster than outgoing breakers
✓ Motor overload slower than branch breaker
✓ All curves coordinated for selective operation
Panel Builder Design Checklist for EPLAN P8
For Each Location, Verify:
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LOCATION DESIGNATION SETUP:
□ Unique location code assigned (e.g., "CP-REACT-1", "MCC-FM")
□ Physical address documented (building, room, coordinates)
□ Distance to main supply calculated
□ Environmental conditions noted (temp, humidity, hazardous area)
ELECTRICAL LOAD ANALYSIS:
□ Connected load calculated (sum of all devices)
□ Demand load estimated (diversity factors applied)
□ Peak inrush current identified (motor soft-start required?)
□ Voltage drop verified (<3% branch, <5% total)
□ Cable gauge selected & confirmed
□ Protective device ratings calculated
COMPONENT SELECTION:
□ Main breaker rated for full load + margin
□ Branch breakers coordinated for selective operation
□ Cable glands, shrouds, terminal blocks specified
□ Mounting hardware selected (DIN rail vs. busbar)
□ Heatsinks/cooling provisions assessed
DOCUMENTATION GENERATION:
□ Schematic diagram created (functional symbols per IEC 60617)
□ Single-line diagram for distribution (power flow)
□ Cable routing diagram (with conduit sizes)
□ Control circuit details (24VDC PSU, interlocks)
□ BOM (Bill of Materials) extracted from EPLAN database
SAFETY & COMPLIANCE:
□ Earth fault protection (RCD/FI) specified
□ Surge protection (Type 1, 2, 3) installed
□ Harmonic filtering assessed (if VFDs present)
□ Temperature monitoring provisions (thermistor/PT100)
□ Emergency stop circuits interlocked
□ Access to live parts restricted (IP54 minimum)
□ Heat dissipation adequate (thermal load calculation)
TESTING & COMMISSIONING:
□ Insulation test performed (500V DC, >10MΩ)
□ Continuity test on all circuits
□ Phase rotation verified (3-phase systems)
□ Load test at 80% rated current
□ Temperature rise verified (no component >40°C rise)
□ Final sign-off & labeling complete
JSON Data Format for Panel Documentation
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{
"installationSite": "Chemical Plant Building C (East Wing)",
"designCode": "++CP-BldgC-East",
"locations": [
{
"locationDesignation": "Reactor Control Room 1",
"locationCode": "CP-REACT-1",
"distanceFromMain": {
"value": 120,
"unit": "meters"
},
"connectedLoad": {
"value": 116.5,
"unit": "kW"
},
"diversifiedLoad": {
"value": 110,
"unit": "kW"
},
"supplyBreaker": {
"type": "NM315H",
"ratedCurrent": {
"value": 200,
"unit": "A"
},
"curve": "Type D"
},
"cableSpecification": {
"cores": 4,
"crossSection": {
"value": 35,
"unit": "mm²"
},
"earthing": {
"value": 35,
"unit": "mm²"
},
"voltageDrop": {
"value": 0.016,
"unit": "%"
}
},
"components": [
{
"functionDesignation": "Reactor Heater 1",
"type": "Resistive Heater",
"power": {
"value": 36,
"unit": "kW"
},
"breaker": "C63",
"cable": "2×6mm²"
},
{
"functionDesignation": "Chiller Motor",
"type": "Three-phase Asynchronous Motor",
"power": {
"value": 22,
"unit": "kW"
},
"breaker": "C32",
"cable": "4×10mm²+PE",
"protection": "Direct-On-Line"
},
{
"functionDesignation": "Temperature Sensor Interface",
"type": "PT100 RTD Transmitter",
"signal": "4-20mA",
"cable": "1.5mm² armored shielded pair",
"distance": {
"value": 35,
"unit": "meters"
}
}
]
}
],
"documentGeneration": {
"schematic": "CP-REACT-1-Schematic.pdf",
"singleLine": "CP-REACT-1-SingleLine.pdf",
"cableRouting": "CP-REACT-1-Cabling.dwg",
"bom": "CP-REACT-1-BOM.xlsx"
}
}
Key Takeaways for Panel Builders
- ++ (Installation Site) = Where your panel is located (building, facility)
- + (Location Designation) = Specific room/area (control room, electrical room)
- = (Function Designation) = What the panel does (motor control, power distribution)
- Use this hierarchy to generate documentation, BOMs, and cable lists automatically
- EPLAN P8 exports this structure into Excel, CAD, and electrical reports
- Data-driven design ensures consistency across multi-location projects
This post is licensed under CC BY 4.0 by the author.