Improving electrical safety in an industrial plant requires more than periodic maintenance checks. It involves a structured assessment of protection systems, fault current levels, arc flash risk, earthing integrity, and compliance with CEA Safety Regulations 2023 and IS 18732. Common failure points — relay settings, unverified earthing, harmonic disturbances, and missing PPE frameworks — are rarely visible without a formal engineering study. This blog outlines the process, the standards, and where most plants fall short.
Most industrial plants have protective devices installed. MCBs, ACBs, VCBs, overcurrent relays — the hardware is in place. What is less certain, in many cases, is whether those devices will perform correctly under actual fault conditions. Having protection equipment installed is not the same as having a coordinated protection system that has been verified against your current system configuration, load profile, and fault current levels.
The gap between installed and verified is where most electrical incidents in industrial facilities originate. Relay settings drift. Equipment is added without a follow-up study. Earthing systems are not retested after modifications. The plant continues to operate — and the risk accumulates quietly.
What Does 'Improving Electrical Safety' Actually Mean in an Industrial Context?
Improving electrical safety in an industrial plant means bringing the protection system, fault current behaviour, earthing network, and equipment condition into a verified, standards-compliant state. It is not limited to replacing aged equipment. It requires assessing whether installed devices are correctly configured, coordinated, and maintained to perform under actual fault conditions.
There are three dimensions to electrical safety in any industrial facility: personnel safety, equipment protection, and regulatory compliance. Addressing only one of these — for example, issuing PPE without establishing incident energy levels — does not constitute a comprehensive safety improvement.
In line with CEA Safety Regulations 2023, protection systems should be maintained in working condition, with relay settings documented and periodically reviewed.
In practice, an improvement process begins with understanding the current state of the system. That requires a formal assessment, not a visual inspection.
Where Do Most Industrial Plants Have Electrical Safety Gaps?
Common electrical safety gaps in industrial plants include unverified relay coordination settings, earthing systems that have not been tested since installation, arc flash hazard assessments that are absent or outdated, and power quality disturbances affecting protection device behaviour. These gaps are not always visible through routine maintenance — they are typically identified during a formal engineering study.
Several recurring gap categories appear across industrial facilities assessed by SAS Powertech:
Protection system gaps — Relay settings not updated after equipment changes: new transformer additions, DG set commissioning, or load expansions. Without a revised coordination study, no one has formally verified that the existing settings still hold.
Earthing and bonding gaps — IS 3043:2018 specifies soil resistivity requirements, electrode configuration, and acceptable earth resistance values. Many earthing systems have not been retested since initial installation.
Arc flash gaps — Incident energy levels have not been calculated, PPE categories have not been assigned. Personnel working near energised equipment have no engineering-backed framework for PPE selection under IEEE 1584-2018.
Power quality gaps — Harmonic disturbances from VFDs, UPS systems, and non-linear loads can affect overcurrent relay discrimination, assessed under the IEC 61000 series. The gap is rarely identified until a relay operates unexpectedly.
What Engineering Studies Are Required to Improve Electrical Safety?
The engineering studies required to improve industrial electrical safety include a Short Circuit Analysis (per IEC 60909), Relay Coordination Study (per IEC 60255), Arc Flash Analysis (per IEEE 1584-2018), Load Flow Analysis, and an Earthing System Assessment (per IS 3043:2018). Each study addresses a specific risk layer. Together, they provide a verified baseline from which protection settings and safety procedures can be established or corrected.
Each study type has a defined input-output structure:
| Study | Governing Standard | What It Establishes |
|---|---|---|
| Short Circuit Analysis | IEC 60909 | Fault current at each bus across all operating modes — the primary input to relay setting calculations. No relay settings have an engineering basis without it. |
| Relay Coordination Study | IEC 60255 | Plots time-current characteristic (TCC) curves for all protective devices. Verifies downstream device always clears the fault before the upstream device. ETAP simulation handles multi-source, multi-bus systems across every operating mode. |
| Arc Flash Analysis | IEEE 1584-2018 / NFPA 70E | Uses fault clearance time from the coordination study to calculate incident energy at each bus. Sets PPE categories and arc flash boundaries for personnel working near energised equipment. |
| Load Flow Analysis | IEC 60364 | Identifies voltage profiles, overloaded conductors, and thermal risk across the distribution network. |
| Earthing System Assessment | IS 3043:2018 | Verifies earth resistance values against standard benchmarks, accounting for electrode configuration and soil resistivity. |
"Studies must be repeated after any significant system change — not only at commissioning. Adding a new transformer, commissioning a DG set, or modifying protection settings during a shutdown all require a re-run of the affected studies."
SAS Powertech Pvt. Ltd. — Power System Engineering PracticeWhat Role Does an Electrical Safety Audit Play in Identifying Risk?
An Electrical Safety Audit provides a structured, field-level assessment of an industrial plant's electrical systems against applicable standards including CEA Safety Regulations 2023, IS 18732, and IS 732. It identifies compliance gaps, protection system deficiencies, earthing condition, and equipment integrity. The audit output serves as a prioritised action plan, distinguishing critical non-compliances from advisory observations.
Routine maintenance covers equipment condition and scheduled replacement cycles. An Electrical Safety Audit covers a different scope — it assesses whether the system, as currently installed and operated, meets its statutory and engineering obligations.
A formal audit typically includes:
- LT and HT panel condition and labelling
- Protection relay settings and documentation
- Earthing network integrity testing
- PPE availability and condition
- Equipment ratings relative to fault levels
- Compliance with IS 732 and IS 18732 at the wiring system level
The audit output is not a generic punch list. It separates critical non-compliances — those with immediate safety or regulatory implications — from advisory observations. This distinction is what makes the output actionable for Plant Heads and EHS Managers working with defined maintenance budgets.
Not sure where your facility stands on electrical safety compliance? A structured Electrical Safety Audit provides the verified baseline your protection scheme needs.
Request an Assessment →Applicable Standards — Clause-Level Reference
Regulations 40–41: Protection System Obligations
Protection systems must be maintained in correct working condition with settings documented and periodically reviewed. Applies to HT-connected industrial facilities.
Short-Circuit Calculation in AC Systems
Governs fault current calculation — the primary input to relay coordination settings. No relay settings have an engineering basis without a compliant short-circuit study.
Measuring Relays & Protection Equipment
Defines relay characteristic curves including IDMT curves forming the basis of time-current grading in coordination studies.
Arc Flash Incident Energy Calculation
Uses fault clearance time — set by relay coordination — as a direct input to arc flash incident energy calculation and PPE category assignment.
Code of Practice for Earthing
Covers soil resistivity requirements, electrode configuration, and acceptable earth resistance values. Mandatory benchmark for earthing system testing.
Electrical Safety Practices & Wiring Systems
IS 18732 covers industrial electrical safety practices including protection system maintenance obligations. IS 732 governs wiring system design and installation.
Electromagnetic Compatibility — Harmonics
Governs assessment of harmonic disturbances from VFDs, UPS systems, and non-linear loads that can affect overcurrent relay discrimination.
Workplace Electrical Safety & Harmonic Limits
NFPA 70E provides the PPE and arc flash boundary framework. IEEE 519-2022 defines harmonic voltage and current distortion limits for power systems.
Key Considerations for Industrial Electrical Safety Improvement
The following are common reference points for facilities reviewing their electrical safety posture:
- Have relay coordination settings been reviewed after the last equipment addition or system modification?
- Is there a documented short-circuit study that accounts for all current operating modes, including captive generation?
- Has arc flash incident energy been calculated at LT and HT buses? Are PPE categories assigned for each work location?
- Has the earthing system been tested against IS 3043:2018 benchmarks within the last two to three years?
- Does the facility have a documented Electrical Safety Audit report referencing CEA Safety Regulations 2023 compliance status?
- Have power quality measurements been taken to assess harmonic levels relative to IEEE 519-2022 and IEC 61000 limits?
Improving Electrical Safety Starts with a Verified Baseline
Electrical safety improvement in an industrial plant is not a function of equipment age or maintenance frequency alone. It requires a verified baseline: protection settings that have been studied, fault current levels that have been calculated, earthing integrity that has been tested, and compliance gaps that have been formally identified.
Facilities operating without this baseline are carrying risk that routine maintenance cannot quantify. The studies and audit frameworks described in this blog — grounded in CEA Safety Regulations 2023, IEC 60909, IEC 60255, IEEE 1584-2018, and IS 18732 — are the engineering inputs that provide that baseline.
The right starting point is understanding where your system currently stands, not assuming the protection scheme commissioned at installation still reflects the plant as it operates today.
"The gap between installed and verified is where most electrical incidents in industrial facilities originate. A formal engineering study closes that gap."
SAS Powertech Pvt. Ltd. — Industrial Electrical Safety EngineeringGet a Professional Assessment of Your System Readiness
SAS Powertech conducts independent, standards-aligned power system studies and electrical safety audits for industrial facilities across India. Our reports provide the engineering basis for protection settings, compliance documentation, and corrective action planning.
Frequently Asked Questions
The first step is a baseline assessment — a formal Electrical Safety Audit combined with power system studies (short circuit and relay coordination) to establish where the current system stands relative to CEA Safety Regulations 2023 and IS 18732. Without a verified baseline, improvement actions lack an engineering foundation.
CEA Safety Regulations 2023 require protection system settings to be maintained in correct working condition, which implies periodic review. Most engineering assessments recommend a full audit at least once every two to three years, or after any significant plant modification — new loads, transformer upgrades, DG commissioning, or relay setting changes.
Arc flash is a rapid release of energy resulting from an electrical fault between live conductors. It poses burn, blast, and pressure-wave hazards to personnel near energised equipment. IEEE 1584-2018 provides the calculation methodology for incident energy and safety boundaries. Reducing arc flash risk requires fault clearance time optimisation through relay coordination, not only PPE provision.
Relay setting adjustments without a formal coordination study are a common source of protection system misalignment. When settings are changed in isolation, the time-current grading between upstream and downstream devices may no longer hold. This can result in nuisance tripping on normal load conditions or delayed fault clearance on an actual fault — both of which indicate protection system failure.
IS 3043:2018 is the primary Indian standard governing earthing system design, installation, and testing. It covers soil resistivity requirements, electrode configuration, and acceptable earth resistance values. CEA Safety Regulations 2023 also reference earthing obligations for HT-connected industrial facilities. Periodic earth resistance testing against these benchmarks is part of a complete electrical safety improvement programme.
Independent Electrical Safety & Power System Engineering Consultancy
SAS Powertech is an independent electrical safety and power system engineering consultancy with over 25 years of experience across industrial and commercial facilities in India, the Middle East, Southeast Asia, and Africa. Services include Electrical Safety Audits, Arc Flash Analysis, Relay Coordination Studies, Short Circuit Analysis, Power Quality Audits, Load Flow Analysis (ETAP-based), and Root Cause Electrical Failure Analysis.
Contact: info@saspowertech.com | +91-9763003222 / +91-9011028802 | 01 Gera's Regent Manor, Baner, Pune 411045