Intelligent Electrical Contracting System
Integrated power distribution, emergency supply, metering and EMS/BMS supervision.
Scorpions Services delivers an end-to-end electrical contracting system that combines reliable normal power, resilient emergency power, safe distribution, granular metering and centralized operational intelligence. The design links the utility supply, MV intake, transformers, MDBs, SMDBs, ESMDB/EMDB panels, final DBs, generators, ATS/AMF, UPS systems, KWH/power-quality meters, MCC/VFD panels and renewable sources into one coordinated installation.
The EMS/BMS layer gives real-time visibility, alarms, trends, demand analysis and reporting, while certified electrical protection stays local to the switchgear and equipment.
Design • Supply • Installation • Testing • Commissioning • Handover • Maintenance
Power
Grid + Generator
ATS, UPS, MDB/SMDB, optional solar
Distribution
Essential + Normal
Panels, cables and loads
Intelligence
EMS / BMS
Alarms, trends, reports
Delivery
End-to-end scope
Design to after-sales
Key Outcomes
- Safe, selective distribution from source to final circuit
- Automatic restoration of essential services after utility failure
- No-break continuity for critical loads through UPS
- Metering by source, building, floor, tenant, department or major load
- Fast fault response using alarm, event and breaker/source-status visualization
- Peak-demand, power-factor, load-profile, cost and sustainability reporting
- Scalable for future panels, meters, generation and renewable energy
Design Principles
- Safety first: protection, earthing, segregation, arc-risk controls, interlocks
- Resilience: utility/generator transfer, essential distribution, UPS autonomy
- Selective operation: coordinated protection limits the impact of a fault
- Open integration: Modbus, BACnet, SNMP, hardwired contacts, gateways
- Maintainability: labeling, spare capacity, accessible panels, complete as-builts
- Energy intelligence: meters, trends, demand KPIs, scheduled reports
Distribution Hierarchy & Source-to-Load Paths
| Path | Route |
|---|---|
| Normal power | Utility → RMU/MV switchgear → Transformer → MDB → SMDB → DB → final loads |
| Emergency power | Generator → generator breaker/control → ATS/AMF → EMDB/ESMDB → emergency/essential SMDB/DB → priority loads |
| No-break power | EMDB/ESMDB → UPS input/bypass → UPS DB → critical IT, controls, medical or security loads |
| Renewable (optional) | PV array/inverter → ACDB/protection → approved MDB connection point → building loads/grid interface |
| Intelligence | KWH/PQ meters, protection relays, equipment controllers → gateway/network → EMS/BMS server → dashboards, alarms, reports |
Abbreviations: MDB Main Distribution Board • SMDB Sub-Main DB • ESMDB Essential Services Main DB • EMDB Emergency Main DB • DB/PDB Power DB • LDB/ELDB Lighting / Emergency Lighting DB • MCC Motor Control Center • ATS/AMF Automatic Transfer Switch / Auto Mains Failure • KWH/PQ Energy / Power-Quality Meter • UPS Uninterruptible Power Supply
Electrical Equipment & Connected Systems
| Equipment | Electrical function | Typical intelligent points |
|---|---|---|
| Utility / grid incomer | Normal source, revenue metering, service protection | Availability, V/A/Hz/kW/kWh/PF, demand, breaker status |
| RMU / MV switchgear | MV isolation, switching and protection | Breaker/isolator position, relay trip, earth fault |
| MV/LV transformer | MV to LV conversion, dry or oil type | Winding temperature, fan status, trip/alarm, load |
| MDB | Main LV board: incomers, bus sections, coupler, major feeders | ACB status/trip, electrical values, demand |
| SMDB | Sub-main distribution by floor, zone, tenant or plant | Breaker status, energy and demand by feeder |
| ESMDB / EMDB | Essential and emergency distribution via ATS/generator | Source and breaker status, energy, load-shed state, transfer history |
| DB / LDB / ELDB | Final power and lighting (normal and emergency) distribution | Incomer energy, trip summary, SPD status, contactor state |
| MCC / VFD panel | Motors for pumps, fans and HVAC plant | Run, trip, local/remote, speed, current, fault code |
| Generator set | Standby or prime emergency source | Available/run/fault, electrical values, fuel, battery, coolant, oil |
| ATS / AMF | Automatic source selection and transfer | Source healthy, switch position, transfer failure, event log |
| Synchronizing panel | Optional multi-generator or utility parallel operation | Synchronization, load share, breaker and alarm status |
| UPS + bypass | No-break supply for IT, controls, medical loads | Input/output/bypass, battery, load %, autonomy, alarms |
| KWH / multifunction meter | Sub-metering and power-quality measurement | kWh, kvarh, kW, kVA, PF, V, A, Hz, demand, harmonics |
| Capacitor bank / APFC | Automatic power-factor correction | PF, stage status, kvar, controller alarm |
| Active harmonic filter | Optional harmonic mitigation | THD, compensation current, loading, alarms |
| Solar PV inverter + ACDB | Optional distributed generation under approved protection | Generation kWh/kW, inverter status, grid condition |
| Earthing & lightning protection | Protective, functional and lightning earthing, surge protection | SPD remote alarm, optional insulation monitoring |
| EMS/BMS server & gateway | Dashboard, history, alarming, analytics, reporting | Modbus TCP/RTU, BACnet/IP, SNMP, API, hardwired I/O |
Operating Philosophy: Emergency Sequence
1Utility fails
ATS validates loss
ATS validates loss
2Generator starts
Voltage and frequency checked
Voltage and frequency checked
3Transfer
Emergency bus energized
Emergency bus energized
4Staged restore
Critical loads first
Critical loads first
5Utility returns
Stability delay
Stability delay
6Retransfer
Cool-down and stop
Cool-down and stop
All events are time-stamped in the EMS/BMS where interfaces are available. Priority loads are restored in engineered steps to limit generator inrush, and non-critical feeders may be shed per the approved load-priority schedule.
Normal operation: meters record source, main bus, sub-main and major-load consumption; the EMS/BMS trends demand, power factor, balance, frequency and energy, and notifies operators of abnormal voltage, overload, breaker trip, communication loss or threshold breach.
UPS operation: supports designated no-break loads during transfer and short interruptions; static/manual bypass permits maintenance; battery autonomy is calculated from real critical load, growth allowance, technology, temperature and end-of-life capacity.
Control boundary: the EMS/BMS is supervisory. Short-circuit, earth-fault, overload, differential, reverse-power and voltage protections remain in certified relays, breakers and equipment controllers. Remote commands require approved cause-and-effect logic, access rights and interlocks.
Energy Metering Levels
- Source: utility import/export, each generator, renewable generation
- Main distribution: each MDB incomer, bus section, major feeder
- Essential/emergency: ESMDB/EMDB incomers and critical feeder groups
- Sub-distribution: SMDB by floor, department, tenant, zone or plant
- Major loads: chillers, AHUs, pumps, lifts, data rooms, kitchens
- Final/tenant: DB or tenant meter for billing or benchmarking
Dashboard KPIs
- Real-time kW, kVA, kvar, PF, V, A and frequency
- Daily/monthly/annual kWh against baseline or budget
- Maximum demand, peak time and load factor
- Phase imbalance, voltage deviation, harmonics
- Utility vs generator vs renewable contribution
- Cost and CO₂ using approved tariff and emission factors
- Meter communication health and abnormal-consumption alarms
Integration Matrix
| Asset | Interface | Monitor | Permitted supervisory control* |
|---|---|---|---|
| KWH/PQ meter | Modbus RTU/TCP | Electrical values, demand, energy, alarms | None |
| MDB/SMDB breaker | Aux contacts / relay / gateway | Open/closed/trip, spring, local/remote | Motorized open/close only if approved |
| Generator controller | Modbus / BACnet / contacts | Available, run, fault, engine data | Start-enable/reset only if approved |
| ATS/AMF | Modbus / contacts | Sources, position, auto/manual, events | Test/transfer under approved procedure |
| UPS | SNMP / Modbus / contacts | Input/output, bypass, battery, load, alarms | Usually monitoring only |
| APFC / harmonic filter | Modbus / contacts | PF, stages, kvar, THD, alarm | Enable/reset if approved |
| MCC/VFD | BACnet / Modbus / hardwired I/O | Run, fault, speed, current, mode | Start/stop/speed subject to interlocks |
| PV inverter | Modbus / vendor API | Generation, status, alarms | Curtailment/reset if authority approved |
| Protection relay | IEC / Modbus / gateway | Trips, measurements, event codes | Protection settings excluded from BMS |
* Final commands depend on the approved control philosophy, authority requirements, vendor warranty, cybersecurity review and equipment interlocks.
Network & Cybersecurity
- Dedicated, segmented EMS/BMS network with managed switches and VLAN/firewall rules
- Unique accounts, role-based permissions, least privilege
- Secure remote access through client-approved VPN
- Time synchronization, tested backups, audit logs for logins, commands and setpoint changes
- Controller and protection operation stays autonomous during server/network interruption
Electrical Contracting Scope of Work
1Survey
Site and loads
Site and loads
2Design
SLD and studies
SLD and studies
3Procure
Approved materials
Approved materials
4Install
Panels and cabling
Panels and cabling
5Integrate
Meters and EMS
Meters and EMS
6Commission
Tests and training
Tests and training
7Support
Lifecycle service
Lifecycle service
| Stage | Scorpions Services activities |
|---|---|
| Survey & verification | Review utility data, loads, existing panels, generators, earthing, routes, interfaces and site constraints |
| Concept & calculations | Load schedule, maximum demand, diversity, source sizing, transformer/generator/UPS concept, metering strategy |
| Detailed engineering | SLD, schematics, layouts, panel and cable schedules, discrimination, short-circuit, voltage-drop and earthing calculations |
| Procurement | Approved switchgear, panels, meters, breakers, ATS, generator/UPS interfaces, cables, containment |
| Installation | Panels, cabling, busduct, trays, conduits, glands, terminations, identification, earthing, field interfaces |
| Programming & integration | Meter addressing, gateways, dashboards, alarms, trends, reports, event logs, user roles |
| Testing & commissioning | Inspection, electrical tests, point-to-point checks, functional sequences, transfer/load and integrated tests |
| Handover | As-builts, calculations, settings, reports, O&M manuals, training, backups, warranties, spare-parts list |
| After-sales | Preventive/corrective maintenance, emergency support, thermography coordination, firmware review, expansion |
Engineering Studies & QA/QC
- Connected-load and maximum-demand schedule
- Short-circuit and equipment-duty verification
- Protection coordination and settings
- Cable ampacity, derating, voltage-drop and withstand
- Transformer, generator and UPS sizing
- Earthing, bonding, lightning and surge assessment
- Arc-flash assessment where required
- Generator step-load and load-shedding sequence
- Metering schedule, CT ratios and communication topology
Installation Quality Controls
- Panels plumb, accessible, ventilated, with working clearances
- Power/control/communication segregation maintained
- Correct glands, lugs, ferrules, torque and cable labels
- Neutral and protective-earth conductors sized and terminated per design
- CT polarity, ratio and shorting verified before energization
- Fire stopping at penetrations; IP ratings maintained
- Spare ways and bus capacity for expansion
Testing & Commissioning
| Test | Minimum verification |
|---|---|
| Visual / mechanical | Nameplates, ratings, clearances, interlocks, torque, barriers, labels, workmanship |
| Cables | Continuity, insulation resistance, phasing, terminations |
| Earthing | Protective-conductor continuity and earth-system tests |
| Switchgear | Primary/secondary injection, breaker operation, trip tests, settings verification |
| Meters / CTs | Polarity, ratio, phase mapping, scaling, readings, communication |
| Generator | Auto/manual start, alarms, load test, step loading, cool-down |
| ATS/AMF | Source failure, start, transfer, retransfer, delays, interlocks, failure modes |
| UPS | Normal, battery, bypass, alarm and autonomy/load test |
| EMS/BMS | Point-to-point, alarm priority, timestamps, trends, reports, user rights |
| Integrated test | Utility outage through full emergency restoration and return to normal |
Project Deliverables
- Approved single-line diagrams, layouts, schematics, panel schedules
- Load schedule, cable schedule, calculation package
- Protection coordination study and settings register
- Metering and communication architecture with address schedule
- Panel general arrangements, wiring diagrams, bill of materials
- Cause-and-effect, operating philosophy, load-shedding matrix
- EMS/BMS point list, alarm matrix, trend schedule, report templates
- Test plans and records, commissioning reports
- As-builts, configuration backups, O&M manuals, training, warranties, spares list
Information Required
- Project type, location, occupancy, hours, authority and standards
- Utility supply, available fault level, tariff, service constraints
- Architectural/MEP drawings, equipment schedules, connected loads
- Critical, essential and non-essential load classification with restoration times
- Generator and UPS ratings, autonomy, synchronizing and redundancy needs
- Existing panel, cable, earthing, ATS and meter information
- Meter granularity, cost allocation and tenant billing needs
- Approved makes, IP rating, spare capacity, cybersecurity and reporting requirements
This page describes a system concept and typical connected equipment. It does not replace the approved electrical design, utility conditions, local authority requirements, manufacturer instructions or a site-specific risk assessment.
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Final ratings, quantities, fault levels and cable sizes are confirmed from the approved project design and site conditions.
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