With the implementation of CPCB IV+ emission norms, stricter retrofitting mandates by Kerala PCB, and evolving global standards, generator owners must comply with new regulations for efficiency, safety, and environmental sustainability.
In this blog, we explore key Indian and international standards applicable to DG sets, including CPCB IV+ emission norms, RECD retrofitting requirements, CPWD installation guidelines, IEC safety standards, and ECBC energy efficiency regulations.
1. CPCB IV+ Emission Standards (Effective from July 1, 2023)
The CPCB IV+ emission norms regulate particulate matter (PM), nitrogen oxides (NOx), and carbon monoxide (CO) emissions from diesel generators.
1.1 Key Features of CPCB IV+ Norms
✅ Applies to all diesel generators up to 800 kW capacity.✅ Lower PM and NOx emissions, making generators more eco-friendly.✅ Mandates advanced emission control devices such as diesel oxidation catalysts (DOC) and diesel particulate filters (DPF).✅ Generators must undergo certification testing at approved labs before market release.
1.2 Comparison: CPCB II vs. CPCB IV+
Parameter | CPCB II (Old) | CPCB IV+ (New) |
Particulate Matter (PM) | Higher Limits | Reduced by 60% |
Nitrogen Oxides (NOx) | High | Lower by 50% |
Carbon Monoxide (CO) | Moderate | Tighter control |
Compliance | Basic Testing | Mandatory Emission Control Devices |
2. Kerala PCB Mandate: Retrofitting of Emission Control Devices (RECD)
As per the Kerala State Pollution Control Board (KSPCB) order dated May 15, 2023, all DG sets 125 kVA and above must comply with retrofitting mandates.
2.1 Retrofitting Requirements
✔ Mandatory installation of Emission Control Devices (RECDs) with at least 70% PM capture efficiency.✔ DG sets above 800 kW must meet additional norms specified in KSPCB’s SOP for High-Rise Buildings.✔ Gas-based retrofitting is encouraged to reduce diesel dependency.
2.2 Approved Testing Labs
Emission control devices must be tested by CPCB-approved laboratories, such as:
ARAI, Pune
ICAT, Manesar
IIP, Dehradun
Non-compliance will lead to legal action under the Environment (Protection) Act, 1986.
3. CPWD Guidelines for Generator Installation
The Central Public Works Department (CPWD) guidelines focus on safe installation, electrical compliance, and fuel storage regulations.
3.1 Installation & Safety Guidelines
✅ DG sets must be installed in well-ventilated spaces to prevent overheating.✅ Exhaust stacks should be positioned away from air intakes to prevent re-circulation of pollutants.✅ Fire safety norms must be followed for fuel storage tanks.
3.2 Electrical Requirements
✔ Automatic Transfer Switch (ATS) for seamless power transitions.✔ Neutral and body earthing resistance < 1 ohm.
4. IEC Standards for Generators
IEC Standard | Description |
IEC 60034-1 | Defines mechanical & electrical performance standards. |
IEC 60034-22 | Specifies alternator testing methods. |
IEC 60255 | Covers relay protection and generator control. |
5. ECBC Guidelines for Energy Efficiency
The Energy Conservation Building Code (ECBC) mandates:✅ High-efficiency alternators for reduced power losses.✅ Integration of renewable energy sources like solar-DG hybrid systems.✅ Load management techniques to optimize fuel efficiency.
Wrapping Up
With CPCB IV+, KPCB retrofitting mandates, CPWD safety guidelines, IEC electrical standards, and ECBC efficiency regulations, diesel generators must now comply with stricter emission controls and efficiency measures.
In the next blog, we will explore Generator Selection Criteria: Factors to Consider While Choosing a DG Set. Stay tuned!
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