As-Built Engineering

Electrical SLD As-Built

Verified single-line diagrams · the foundation for every power system study.

Your single-line diagram is the foundation for load flow, short circuit, arc flash, protection coordination · everything PSS. If it's wrong, every study downstream inherits the gap. We rebuild it from LiDAR + tag verification + DCS extraction · IEEE 315 / IEC 60617 compliant, ETAP / DigSILENT-native, ready to drive studies.

Why this matters

Why an SLD update is the precondition for any meaningful PSS work

Plant electrical systems evolve · new feeders, new transformers, breaker replacements, capacitor bank additions. The SLD on the wall hasn't tracked. Every PSS study (load flow, short circuit, arc flash) we do starts with an SLD audit · we find an average 22% discrepancy between the SLD-as-marketed and the SLD-as-installed. Updating the SLD as a precondition makes every downstream study 30-50% faster and 100% more credible. We deliver it ETAP / DigSILENT-native so the PSS study can start the day after sign-off.

Method

How we deliver Single-Line Diagrams (SLD)

CEng MIE India-signed deliverables · LiDAR-powered where applicable · digital twin handover ready · routes to the As-Built Engineering practice lead within 24 hours.

Source aggregation

Existing SLD + electrical drawings + protection settings + MCC schedules consolidated. Discrepancies flagged for field check.

Field verification + LiDAR cross-check

Substation, MCC, MV switchgear walkdown · cable tag verification, breaker rating capture, protection device inventory. LiDAR point cloud cross-references panel locations.

SLD rebuild

Drawn in your native CAD environment (AutoCAD Electrical, AVEVA, Bentley) or directly into the PSS modelling environment (ETAP / DigSILENT).

Network model + handover

ETAP or DigSILENT model built from the verified SLD · ready for load flow / short circuit / coordination / arc flash. Drawing pack and model handed over together.

Sign-off + governance

CEng MIE-signed. Governance protocol delivered for keeping it current.

Standards + compliance

Built to the standards your auditors quote

Reports reference the international and national standards your regulators, F500 audit teams, and corporate process safety leads cite. Every deliverable signed by a Chartered Engineer (CEng MIE India).

IEEE 315 · Graphic Symbols for Electrical and Electronics Diagrams
IEC 60617 · Graphical symbols for diagrams
IEC 61082 · Preparation of documents used in electrotechnology
IEEE 141 (Red Book) · Electric Power Distribution for Industrial Plants
IS 12032 (India) electrical drawing conventions, AS 1102 (Australia)

Anonymous case anchors

What this looks like in production

Three anonymised engagements from our verified roster · quantified outcomes, no client names disclosed without written permission.

Refinery, India · SLD audit before PSS

22% discrepancy found in legacy SLD vs field. SLD rebuilt + ETAP-loaded · PSS suite delivered 8 weeks faster than baseline.

Pharma, USA · GMP SLD validation

SLD updated + cross-referenced to cleanroom equipment register. Audit-ready electrical drawing chain.

Petrochem, KSA · multi-substation rebuild

12 substations updated to consistent SLD standard. Replaced 18-year-old drawings · digital twin electrical layer foundation.

Frequently asked

Single-Line Diagrams (SLD) · the practical questions

Why not just buy an SLD template and fill it in?

Because the template doesn't know what's actually in the plant. The SLD is a verification activity · it's about reconciling drawing reality with field reality. The deliverable is a CAD drawing, but the value is the verification.

Do you deliver in AutoCAD or just ETAP?

Both. AutoCAD (or AVEVA Electrical, Bentley Substation, etc.) for the engineering drawing pack. ETAP / DigSILENT model for the studies. They're linked · changes flow.

How does this differ from the asset register service?

SLD = electrical schematic. Asset register = equipment list with location, nameplate, criticality. Often delivered together for electrical assets. SLD focuses on connectivity + ratings, register on inventory + condition.

Can you handle multi-voltage / multi-substation networks?

Yes · industrial campus networks (132 kV → 33 kV → 11 kV → 415 V) are our standard scope. We've done refineries with 40+ substations, steel plants with 5+ voltage levels.

Does this feed into Wistwin?

Yes natively. SLD + asset register + load flow model form the electrical layer of the Wistwin digital twin. Updates flow live as your CMMS updates.

Scope your Single-Line Diagrams (SLD) engagement.

Tell us your plant, region, and scope · a named Chartered Engineer responds within 24 hours.

4 fields. No phone interview to start.
Per-discipline routing to the As-Built Engineering practice lead.
Anonymous case anchors sent with first reply.
Same-day callback for deadline-driven enquiries.

As-Built Engineering Scoping

P&ID + Iso + SLD + GA · LiDAR-powered · routes to As-Built Practice.