What Does an ITO Do in Electric Projects? Role and Deliverables

The Inspector Técnico de Obras (ITO)—Chile’s Technical Works Inspector—ensures a project meets drawings, codes, and contracts. In short, the ITO protects quality, safety, schedule, and traceability from design review through commissioning.
If you’re trying to understand what an ITO does, this practical guide is tailored to substations and transmission lines in the Chilean context.
With the basics set, let’s see why the ITO’s role is mission-critical for technical and contractual success.

Why the ITO is essential in electric works

An ITO reduces rework, mitigates risk, and prevents schedule/cost drift. They bring order: reviewing designs, auditing materials and installation, controlling QA/QC, documenting non-conformities, and enforcing compliance (SEC, CNE, OGUC, plus corporate compliance under Law 20,393).

Now to the “how”: the ITO’s concrete functions on site and at the technical office.

Critical functions of the ITO in electric projects

Control of engineering and drawings

• Review of IFC drawings, reports, and specifications.
• Managing RFIs (technical queries) and controlled changes.
• Checking cross-discipline clashes (civil–electrical–control).

QA/QC and technical traceability

• Building the Inspection & Test Plan (ITP/PIE).
• Receiving materials with data sheets and certificates.
• Inspections of installation: cable routing, panels, earthing, finishes.
• Electrical tests: continuity, insulation (megger), thermography, protection tests, secondary injection, transformer tests, soil resistivity (Wenner).

Regulatory and contractual compliance

• Alignment with SEC, CNE, OGUC and client standards.
• Managing NCRs (non-conformities) and corrective actions.
• Contract scope control and partial/final acceptance records.

Safety and risk control (HSEC)

• Verifying Work Permits, procedures, and LOTO (lockout/tagout).
• Coordinating energized work and safety zones.
• Logging incidents/near-misses and lessons learned.

Progress, cost, and schedule control

• S-curve, physical progress vs. plan, critical path.
• Validating valuations and payment certificates.
• Daily/weekly reporting to the client.

All of that must leave an auditable trail. Which documents prove it?

ITO deliverables requested by owners

Always check CNE — Minimum Design Requirements for Transmission Facilities

• ITP/PIE and inspection matrix (hold points).
• Daily/weekly reports with progress, photos, and checklists.
• Materials register (certificates, traceability).
• RFI / NCR / meeting minutes.
• Test dossier (signed protocols, results).
• Punch list and closure records.
• Acceptance certificate and O&M manuals handed over.

How does this unfold over time? Here’s the ITO process at a glance.

ITO process: from pre-construction to energization

Pre-construction

Design and PIE review, schedule validation, permits, and safety plan.

Construction

Installation inspections, document control, NCR/RFI management, progress tracking vs. baseline.

Pre-commissioning

Functional testing, protections, SCADA/telemetry, earthing, finishes.

Commissioning and energization

Protocols with system coordinator/client, energization records, test dossier.

Close-out

Final acceptance, punch list cleared, as-built drawings and manuals delivered.

In transmission and substations the ITO needs specific expertise—here’s what changes.

Particulars for substations and transmission lines

• Substations: GIS/AIS bays, protection coordination, busbars, power transformers, SCADA, remote control, testing CTs/VTs and injection sets.
• Transmission lines: foundations, tower verticality, insulator strings, stringing and re-tensioning of conductor/OPGW, sagging, structure earthing measurements, and corona considerations in HV.

To hold that standard, what profile and skills should you demand?

Requirements and competencies of a strong electrical ITO

• Education: electrical/civil/engineering degree; diplomas in ITO/QA-QC.
• Codes: SEC, CNE, OGUC, client standards; Law 20,393 compliance.
• Tools: MS Project/Primavera, QA/QC matrices, document control software, thermography, test kits.
• Soft skills: sound judgment, contractor communication, conflict management, safety mindset.

If you’re shortlisting providers now, run this checklist.

How to choose an ITO provider for an electric project (checklist)

• Proven experience in substations/lines of similar voltage and conditions (altitude, pollution, corrosion).
• Team certifications and hands-on expertise in electrical testing.
• Clear PIE + QA/QC methodology; transparent NCR/RFI management.
• Robust HSEC capabilities and a zero-harm culture.
• Clear reporting cadence (daily/weekly) and document traceability.
• References and final acceptance records in comparable projects.

Need a specialized electrical ITO for transmission or substations? Let’s talk.

You improve what you measure—these are the KPIs to track.

KPIs an ITO should monitor in electric works

• First-time quality (FTQ): ≥ 90% of inspections approved on first pass.
• RFI lead time: ≤ 3 business days.
• Open NCR rate: < 5% of total inspections in the period.
• Average NCR closure time: ≤ 10 business days.
• Schedule Performance Index (SPI): 0.95–1.05 vs. plan.
• Cost Performance Index (CPI): 0.95–1.05 vs. budget.
• HSEC compliance: 100% critical permits validated; TRIR trending to 0.
• Document traceability: 100% certificates and test protocols archived.

Hiring well prevents half the issues. Here are the common pitfalls to avoid.

Common mistakes when hiring an ITO (and how to avoid them)

1. Generic experience, not electrical.
   Demand case studies in substations/lines with the same voltage and environmental conditions.
2. Vague QA/QC methodology.
   Require PIE and a detailed inspection matrix with hold points and acceptance criteria.
3. Weak command of electrical testing.
   Validate instruments and protocols: megger/ducter, secondary injection, CT/VT tests, thermography, Wenner.
4. Limited HSEC capacity.
   Review LOTO procedures, critical permits, and supplier safety KPIs.
5. Poor reporting.
   Enforce daily/weekly reports with photos, RFI/NCR stats, and S-curve.

Standardize from day one with a PIE checklist.

Baseline checklist: PIE + QA/QC for HV/MV

Before construction (pre-construction)

• PIE approved by the owner.
• Inspection matrix with defined hold points.
• Test plan: continuity, insulation, protections, SCADA/telemetry.
• Current instrument calibrations.
• HSEC plan and critical permits validated.

During construction

• Materials received with certificates (CT/VT, cables, insulators, equipment).
• Installation inspections: trays, panels, earthing.
• RFIs answered within SLA.
• NCR management with evidence and verified closure.

Pre-commissioning/Commissioning

• Test protocols executed and signed.
• Verified protection coordination (selectivity).
• SCADA and telemetry integrated and tested.
• Energization records and consolidated test dossier.

Close-out

• Punch list 100% cleared.
• As-built drawings and O&M manual delivered.
• Final acceptance signed.

To show impact, here’s a short technical case example.

Short technical case (owner format)

Context: 110/23 kV substation + 15 km transmission line. Contract time: 11 months.
Pain points: rework in cable routing; RFIs without SLA.
ITO actions:

• Reworked PIE adding 7 critical hold points.
• RFI SLA at 3 days with online log; NCR board with aging.
• Stronger test plan: 100% secondary injection + targeted thermography.
  Results:
• FTQ improved from 78% → 94% (month 3 to 7).
• Open NCRs down 61% in 6 weeks; RFI lead time 12 → 3 days.
• On-time commissioning; SPI 1.02 / CPI 0.98; zero lost-time incidents.

If some terms are new, this quick glossary helps.

ITO quick glossary

• PIE/ITP: Inspection & Test Plan (what, how, when, who).
• RFI: Request for Information; formal technical query.
• NCR: Non-Conformity Report; deviation requiring correction.
• FTQ: First-Time Quality; first-pass approvals.
• SPI/CPI: Schedule/Cost performance indices.
• LOTO: Lock Out Tag Out; safe isolation/identification procedures.
• Wenner: Four-probe method for soil resistivity.
• SCADA: Supervisory Control and Data Acquisition; real-time control.