Last reviewed 24 September 2026 · Reviewed for CEIG process, CEA safety regulations basis Authority names, portals, fees and timelines change with state notifications; confirm the live position with the authority before relying on it.

Electrical Inspector (CEIG) Approval for Factories: HT Installations, Substations & DG Sets

CEIG approval is the clearance of your electrical installation by the state Chief Electrical Inspectorate under the Electricity Act 2003 and the CEA safety regulations — drawings approved first, the built installation tested and inspected after — and the DISCOM will not energise an HT connection, substation or DG set without it.

Every approval in the factory sequence delays you on paper. This one delays you in the dark. Until the Chief Electrical Inspectorate (CEIG) approves your HT installation, the DISCOM will not energise the connection — which means a finished plant, installed machines, hired staff, and no power to commission any of it. CEIG approval is the last gate before electricity, and teams that treat it as a formality routinely lose the final month of their schedule to it.

This guide covers Electrical Inspector approval for industrial installations — what needs approval, the drawing-first process, what the inspector tests on site, DG-set and transformer specifics, and the defect list that fails inspections in Punjab, Haryana and UP. It expands Phase 5 of the complete factory approvals roadmap.

The sequencing point: CEIG approval has a drawing stage and an inspection stage. Start the drawing stage during construction — an installation built to unapproved drawings is an installation built on hope.

The legal basis — and what needs approval

The framework is the Electricity Act 2003 read with the CEA (Measures relating to Safety and Electric Supply) Regulations — the successor regime to the old Indian Electricity Rules. Administration is by the state Chief Electrical Inspector / Electrical Inspectorate (CEIG): the Chief Electrical Inspector’s organisation in Punjab and Haryana, and the Directorate of Electrical Safety in UP.

What typically requires inspectorate approval before energisation:

HT/EHT installations — your 11 kV (or higher) connection, the substation, transformers, HT panels, cabling and protection
Substations and switchrooms — layout, clearances, earthing, fire provisions
DG sets — installation approval/registration before commissioning, including changeover and protection arrangements
Material alterations — added transformers, capacity enhancement, new HT loads: the approval duty re-opens with each material change
Specified installations beyond voltage triggers — e.g. certain public-assembly and multi-storey premises, per state practice

LT-only micro-units may sit below the approval triggers — but any factory taking an HT connection (which is nearly every real factory) is squarely in scope. Confirm the current thresholds with your state inspectorate.

Stage 1 — Drawing approval

Before the installation is built (in practice: while civil work runs), the scheme goes to the inspectorate:

The submission set (typical):

Document	What the reviewer reads it for
Single-line diagram (SLD)	The whole electrical story: incomer, metering, transformers, breakers, bus, outgoing feeders, DG interface
Load detail / load schedule	Connected vs demand load; matches the DISCOM sanction and the machinery list
Substation layout	Equipment arrangement, clearances, access, ventilation, cable routes
Earthing design	Earth-pit layout, conductor sizing, separate earthing for neutral/body/lightning as applicable
Protection scheme	Relay coordination, breaker ratings, fault-level basis
Transformer & equipment specs	Ratings, type (oil/dry), fire-safety implications of each
DG scheme	Rating, changeover interlock, neutral management, exhaust height

The classic drawing-stage errors: an SLD that disagrees with the machinery list (DISH file says 800 HP of machines, the load schedule says 400 kVA and no one reconciled them); protection ratings copied from a previous project with a different fault level; a substation drawn into a corner with no equipment-movement access; DG neutral/earthing arrangements left “to the contractor.”

Stage 2 — Installation, testing & inspection

Build to the approved drawings, through a licensed electrical contractor with work executed and certified by licensed/competent personnel — the inspectorates check the contractor licence as a threshold matter.

Before calling the inspection, complete and document your own tests:

Insulation resistance across the installation
Earth-resistance for every pit and the grid, with values on record
Transformer tests — ratio, IR, oil BDV where applicable, protection trials
Relay/breaker function — settings per the coordination study, trip tests
HT cable tests post-laying
Operational checks — interlocks, changeover, emergency stops, signage, rubber mats, danger plates, first-aid/shock-treatment chart, fire extinguishers in the switchroom

The inspector verifies the installation against the approved drawings and the regulations — physically, and with the test records in hand. On clearance, the approval/energisation sanction issues to the DISCOM, and the connection is charged.

Realistic timeline: drawing approval indicatively 2–4 weeks, inspection scheduling and clearance another 2–4 weeks — call it 3–8 weeks end to end for a clean file, longer where defects need re-inspection. Statutory fees are modest and state-scheduled; the schedule risk, not the fee, is the cost.

DG sets, transformers & the details that snag

DG installation approval is its own item — rating-based registration/approval, a proper changeover interlock so the set can never backfeed the grid, correct neutral treatment, exhaust stack height per emission norms (and, in NCR districts, the DG-usage regimes layered on top)
Transformer rooms — oil-filled transformers carry fire-separation, soak-pit/drainage and door/ventilation requirements; dry-type choices simplify the civil work and are often worth the premium indoors
Metering & CT/PT — the DISCOM’s metering arrangement must match the approved SLD; mismatches stall energisation between two departments, with you in the middle
Lightning protection — where provided/required, its earthing is designed and recorded like the rest

The defect list — what fails inspections

Earth resistance above acceptable values, or pits that exist on the drawing and not in the ground
Unlicensed execution — no licensed contractor, no competent supervision certificates
Clearances — HT equipment squeezed against walls; no safe working/operating space
Protection mis-set — relays on factory defaults, breaker ratings mismatched to fault level
DG interlock absent or defeatable — the single most safety-critical DG defect
Missing statutory furniture — danger notices, shock chart, mats, extinguishers, marked exits in switchrooms
As-built ≠ as-approved — feeders added during fit-out, never reflected on the SLD
No test records — an untested installation is an unapproved installation, whatever was built

Every one of these is cheap during construction and expensive on inspection day — the pattern of the whole approvals sequence.

After energisation — the owner’s continuing duties

CEIG clearance is a gate, not a discharge. The CEA (Measures relating to Safety and Electric Supply) Regulations, 2023 — notified on 8 June 2023 in supersession of the 2010 regulations — put the standing duty on the owner of the installation. It does not transfer to the contractor who built it, and it is not spent by the inspector who cleared it.

Regulation 32(8) is the sentence the rest hangs off: it is the owner’s responsibility to maintain and operate the installation in a condition free from danger, and as recommended by the manufacturer or by the relevant standards. Everything below is that duty made specific.

An Electrical Safety Officer, from 250 kW. Under regulation 5(3), a factory registered under the Factories Act, 1948 with more than 250 kW connected load must designate an Electrical Safety Officer. That is a small plant, and it is the duty most often missed. Regulation 5(2) sets the qualification — a degree in electrical engineering with at least five years in operation and maintenance, or a diploma with at least ten. The officer inspects the installation at intervals not exceeding one year, records the result in the Schedule II form, and keeps the test reports and a register of safety recommendations acknowledged by the owner, available to the Electrical Inspector on demand.
Designated persons, and the register that proves it. Under regulation 3, work on electrical lines and apparatus is carried out by persons the owner has designated — and nobody may be designated unless they hold a certificate of competency or electrical work permit issued by the Appropriate Government and their name is entered in a register the owner maintains. Regulation 4 lets the inspector call for that register. A competent electrician whose name was never written down does not satisfy it.
Who inspects, and who self-certifies. The 2023 regime splits on a notified voltage, set for your state by the Appropriate Government. Above it, periodic inspection and testing is the Electrical Inspector’s. At or below it, the owner inspects, tests and self-certifies, filing the report with the inspectorate in the relevant Form of Schedule II — and if it is not acknowledged within three working days it is deemed received (regulation 32(1)–(3)). Periodicity is as the Appropriate Government directs; the proviso to regulation 32(2) caps it at five years. Confirm your state’s notified voltage and its directed interval — both vary, and both are the state’s to change. One carve-out to check before you rely on self-certification: regulation 32(4) (and regulation 45(1)(b) for the pre-supply case) puts every installation covered by section 54 of the Act, and those of mines, oil-fields and railways, back with the Electrical Inspector regardless of the notified voltage.
The six-month shutdown re-opens it. An installation shut down for six months or more is inspected, tested and certified again before supply recommences — by the owner, self-certifying, at or below the notified voltage (regulation 45(1)(a)), and by the Electrical Inspector above it (regulation 45(3)). Seasonal plants, mothballed lines and units idled through a downturn get caught here, usually on the day they want to restart.
What non-compliance actually costs. Defects the inspector records and the owner does not rectify within the time stated make the installation liable to disconnection on the inspector’s direction, after not less than forty-eight hours’ notice — unless an appeal under section 162(2) of the Act has stayed it (regulation 32(7)).

Why plants fall out of compliance, almost always the same way: the CEIG file is run by the project team, and the project team leaves. The continuing duties land on an operations team that never saw the drawings, does not know a notified voltage applies to them, and discovers the Schedule II record-keeping when an inspector or an insurer asks for it. The fix is unglamorous — name the Electrical Safety Officer before handover, open the designation register on day one, and put the inspection interval in the maintenance calendar rather than in somebody’s memory.

State-by-state CEIG guides

The authority, its parent department, the portal and the DISCOM interface all change at the state line — and in Delhi the inspectorate does not even sit under the energy department. The term itself — what the Chief Electrical Inspector approves, and when — is defined under CEIG approval in the glossary. Each guide below covers what is specific to that state:

Punjab — Chief Electrical Inspector under the Department of Power; PSPCL as sole DISCOM
Haryana — inspectorate headquartered in Chandigarh; DHBVN/UHBVN split
Delhi — inspectorate under the Labour Department; lifts share the same office; three DISCOMs
Uttar Pradesh — Vidyut Suraksha Nideshalay, Lucknow; online applications; PVVNL belt
Rajasthan — Electrical Inspectorate under the Energy Department; heavy captive-solar caseload
Himachal Pradesh — Department of Electrical Inspectorate; HPSEBL statewide; the BBN belt
Uttarakhand — Department of Electrical Safety at Haldwani; Single Window Clearance System

Punjab, Haryana & UP — practical notes

Punjab: the Chief Electrical Inspector’s office processes industrial files with online routing; Ludhiana and Mandi Gobindgarh’s induction-furnace and rolling-mill loads mean fault-level and protection scrutiny is real, not ritual.
Haryana: CEI Haryana coordinates with the DISCOMs (DHBVN/UHBVN) on energisation; Gurugram–Manesar’s dense HT connections make metering/SLD consistency the common snag.
UP: the Directorate of Electrical Safety handles approvals with Nivesh Mitra visibility; in NOIDA/GNIDA/YEIDA estates, NPCL/UPPCL connection timelines run in parallel — synchronise the CEIG file with the connection application so neither waits on the other.

Common mistakes

Starting the CEIG file after construction — it belongs in parallel with civil work.
Letting the SLD drift — every fit-out change lands on the drawing, or the inspection fails on arrival.
Treating earthing as commodity digging — it is a designed system with recorded values, and the first thing measured.
Buying the transformer before the drawing approval — type and rating comments at drawing stage are common; steel is expensive to re-order.
No single owner across DISCOM + CEIG + contractor — energisation is a three-party handshake; unowned, it becomes a three-way wait.

Frequently asked questions

What is CEIG approval?

Approval of an electrical installation by the state Chief Electrical Inspectorate under the Electricity Act 2003 and CEA safety regulations — drawings first, then physical inspection — required before the DISCOM energises HT installations.

Is CEIG approval required for every factory?

Any unit taking an HT connection (11 kV and above), installing a substation/transformer, or commissioning DG sets of consequence is in scope. Small LT-only units may sit below the triggers — confirm current state thresholds.

What documents does the CEIG drawing submission need?

SLD, load schedule, substation layout, earthing design, protection scheme, equipment specifications and the DG scheme — consistent with the DISCOM sanction and the machinery list.

How long does CEIG approval take?

Indicatively 3–8 weeks end to end for a clean file: 2–4 weeks drawing approval, 2–4 weeks inspection and clearance. Defects and re-inspections extend it. Confirm current norms with your state inspectorate.

Who can execute the electrical installation?

A licensed electrical contractor, with supervision/certification by licensed or competent persons per the regulations — the inspectorate checks licences as a threshold matter.

What tests are needed before inspection?

Insulation resistance, earth resistance (recorded per pit and grid), transformer tests, relay/breaker function per the coordination study, HT cable tests, and operational checks of interlocks and changeover — all documented.

Do DG sets need separate approval?

Yes — installation approval/registration before commissioning, with the changeover interlock, neutral treatment and exhaust arrangements scrutinised. NCR-district units also carry DG-usage and emission regimes from the air-quality framework.

What earthing does a factory installation need?

A designed earthing system — separate earths for equipment body, system neutral and lightning protection as applicable, with conductor sizing and measured resistance values on record. It is the most commonly failed item.

Can the DISCOM connect power before CEIG clearance?

No — for installations in scope, energisation waits on the inspectorate’s clearance. That is precisely why the file belongs in parallel with construction, not after it.

What if I add load or a transformer later?

Material alterations re-open the approval duty: updated drawings, approval, testing and inspection for the altered installation. Silent additions surface at the next inspection or, worse, after an incident.

Are periodic inspections required after energisation?

Yes. Under regulation 32 of the CEA safety regulations 2023, installations above the voltage your state has notified are periodically inspected by the Electrical Inspector; at or below it the owner inspects, tests and self-certifies to the inspectorate on the Schedule II form. Periodicity is directed by the Appropriate Government and cannot exceed five years. Keep the test calendar and records live; renewals and incident inquiries both start there.

Who is responsible for electrical safety in a factory under the CEA regulations?

The owner of the installation. Regulation 32(8) makes it the owner’s responsibility to maintain and operate the installation in a condition free from danger and as recommended by the manufacturer or the relevant standards. The duty does not pass to the contractor who built it, and it does not end with the inspector’s clearance.

Does a factory need an Electrical Safety Officer?

Regulation 5(3) requires a factory registered under the Factories Act, 1948 with more than 250 kW connected load to designate an Electrical Safety Officer — a degree holder in electrical engineering with at least five years in operation and maintenance, or a diploma holder with at least ten. The officer inspects the installation at intervals not exceeding one year and keeps the test reports and a register of safety recommendations available to the Electrical Inspector.

What happens if inspection defects are not rectified?

Regulation 32(7): where the owner fails to rectify recorded defects within the time stated in the inspector’s report, the installation is liable to be disconnected on the inspector’s direction after not less than forty-eight hours’ notice — unless an appeal under section 162(2) of the Electricity Act 2003 has stayed it.

How does CEIG fit the overall approvals sequence?

It gates energisation — after the building and fire scheme, before commissioning, alongside boiler and PESO where applicable, and ahead of the CTO and Factory Licence that close the chain. Full order: the approvals roadmap.

Get energised on schedule

Electrical is our home ground. If your project has a substation, an HT connection or DG sets anywhere in it:

CEIG Approval Consultancy — we prepare the drawings and calculations the inspectorate reviews, file them, answer the queries and attend the inspection
Electrical Infrastructure — substation, HT/LT, panels, earthing and protection, designed and executed to pass
CEIG Readiness Checker — check your applicability and readiness score in under a minute
Transformer Sizing and DG Sizing calculators — the two ratings the inspectorate file is built around
HT/LT work we have delivered: HT/LT power and industrial HVAC for a global manufacturer, and MEPF for a ₹100-crore alloy-wheels plant in Jammu
Request a Budgetary Proposal — a real number for the compliant electrical scope, CEIG file included
The complete factory approvals roadmap — the full 16-step sequence

Have a single-line diagram already? Send the SLD, the load list and the transformer or DG details for a CEIG pre-inspection review — an engineer replies with what the inspectorate will check and what is still missing. Request a technical review.

Secured Engineers Pvt. Ltd. is an MEPF EPC contractor — 535+ projects across 18+ states. This guide is general information, not legal advice; approval triggers, forms and fees are state-specific and change — confirm the current position with your state electrical inspectorate.

Sources and standards

Electricity Act 2003 (2003, as amended) — The Electricity Act, 2003. Government of India, Ministry of Power. Publisher.The statutory framework for generation, distribution, licensing and the Electrical Inspector's role (Section 162).
CEA (Measures relating to Safety and Electric Supply) Regulations (2023 (superseding the 2010 regulations)) — Central Electricity Authority (Measures relating to Safety and Electric Supply) Regulations. Central Electricity Authority. Publisher.Safety requirements for electrical installations, inspection of HT installations before energisation, periodic inspection, earthing and protection.
IS 3043 (2018) — IS 3043 — Code of Practice for Earthing. Bureau of Indian Standards. Publisher.Earthing system design, electrodes, resistance values and testing.
Chief Electrical Inspector to Government (state) — Office of the Chief Electrical Inspector to Government — state electrical inspectorates. State governments. Drawing approval, inspection and energisation clearance under the Electricity Act and the CEA safety regulations; process and portal differ by state.

Standards are cited to support the technical statements on this page. Where a standard has been revised, the edition shown is the one verified at the time of review; the edition in force for a project is the one the authority applies.