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Electrical Load List & Earthing / Lightning Protection

Electrical engineering — load lists, earthing, lightning, and Ex design

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Technical overview

Electrical Load List &
Earthing / Lightning Protection

Electrical engineering for process facilities encompasses more than power distribution. Inadequate earthing contributes to static ignition in hazardous areas; undersized lightning protection causes equipment damage and ignition risk; incorrect Ex equipment selection creates non-compliance that is expensive to remediate post-construction. Arborion Global delivers electrical engineering from load list through single-line diagrams, IEEE 80 earthing design, IEC 62305 lightning protection, and full IEC 60079 Ex equipment selection — integrated with the hazardous area classification drawing.

Electrical Load List & Earthing / Lightning Protection — Overview
Engineering process

Electrical Load List & Earthing / Lightning Protection workflow

Load Identification

Identify all electrical loads, assign operating/starting duty, demand factors, and power factor by system.

Single-Line Diagram Development

Develop SLD covering switchgear rating, transformer sizing, cable routes, and fault-level calculation.

Earthing Grid Design

Design earth grid per IEEE 80; calculate step and touch voltages; specify earthing conductor sizing and test points.

Lightning Protection Design

Conduct risk assessment per IEC 62305; determine protection level; design LPS with down-conductor and SPD specification.

Ex Equipment Selection

Review area classification drawings; select Ex category, protection concept, and T-class per IEC 60079 for each installed item.

Commissioning Support & Records

Support earthing continuity tests, lightning system inspection, and Ex equipment certification registry.

Electrical Load List & Earthing / Lightning Protection — Scope
Scope of work

Every deliverable — from basis to handover

Complete Electrical Load List & Earthing / Lightning Protection scope — every calculation, drawing, specification, and construction support activity.

Electrical load list with operating, starting, and demand-factor assignments per system
Single-line diagram development covering distribution, switchgear, and UPS systems
Fault-level calculation and protection coordination study
Earth grid design per IEEE 80: grid sizing, mesh voltage, step and touch voltage verification
Lightning risk assessment per IEC 62305-2; LPS design with down-conductors and SPD selection
Bonding and earthing for static control in hazardous area locations
Ex equipment selection per IEC 60079: equipment group, category, protection concept, T-class, IP rating
Cable sizing schedule, routing, and segregation from instrument and SIS cables
Engineering outcomes

Outcomes of Electrical Load List & Earthing / Lightning Protection

Arc Flash & Earth Fault Protection
  • Sharpens earthing and lightning protection
  • Supports HAC and Ex equipment selection
  • Reduces electrical incident exposure
  • Strengthens grounding for static control
IEC 60364 / IEEE 80 / ATEX Defence
  • Maintains compliance with IEEE 80, IEC 62305, IEC 60079
  • Supports NFPA 70 (NEC)
  • Documents Ex equipment certification
  • Holds up under AHJ review
Electrical System Reliability & Availability
  • Slashes electrical equipment failure
  • Hardens lightning incident protection
  • Enables credible load growth
  • Improves earthing test programmes
Load List & Earth Study Efficiency
  • Right-sizes electrical equipment
  • Avoids over-specified earthing
  • Reduces lifecycle electrical cost
  • Supports CAPEX optimisation
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