FDNY Certificate of Fitness Study Material - W-27 - Supervision of Stationary Energy Storage Systems (ESS) in Group R-3 Occupancies

Sep 25, 2026

Uploaded by Angel

FDNY Certificate of Fitness study material for the W-27 requirement covering supervision of stationary energy storage systems (ESS) in Group R-3 occupancies. It explains how to apply and pay for the exam online, including account creation and log-in, and describes eligibility such as waiving the W-27 exam for applicants holding a B-28/W-28 COF. The booklet includes exam-specific information, definitions, and study sections on case studies, ESS technologies, benefits and hazards, permits and responsibilities, and general design and installation requirements.

LanguageEnglish

CategoryExam

FormatPDF

Pages75

Reading Time3 h 9 min

AccessFree to download

EXAM SPECIFIC INFORMATION FOR W-27 CERTIFICATE OF FITNESS

STUDY MATERIAL AND TEST DESCRIPTION

INTRODUCTION

PURPOSE OF FIRE CODE 608

PURPOSE OF RULE 3 RCNY 608-01

PURPOSE OF THE STUDY MATERIAL

DEFINITIONS

CHAPTER 1. CASE STUDIES

CHAPTER 2. HOME STATIONARY ENERGY STORAGE SYSTEMS

2.1 Five Types of Energy Storage Technologies

2.2 Different Battery Energy Storage Systems Benefits and Hazards

2.3 Battery Systems Size Thresholds (only applies to outdoor/rooftop stationary)

2.4 Multiple Battery Systems

CHAPTER 3. PERMITS, ROLES AND RESPONSIBILITIES

3.1 Permits

3.2 Obligations of Owner and Operator

3.3 W-27 Certificate of Fitness Holder’s General Duties

3.4 Subject Matter Experts (SMEs)

3.5 ESMS/BMS monitoring facility staff

CHAPTER 4. GENERAL DESIGN AND INSTALLATION REQUIREMENTS

4.1 Listing and Full-scale testing standards

4.2 Equipment Approval (Certificate of Approval)

4.3 Maximum Aggregate Rated Energy Capacity for Group R-3 Occupancies

4.4 DOB and FDNY Approval

4.5 Location and Construction

FIRE DEPARTMENT ● CITY OF NEW YORK CERTIFICATE OF FITNESS STUDY MATERIAL FOR W-27 Supervision of Stationary Energy Storage Systems (ESS) in Group R-3 Occupancies (citywide) This book is provided to the public for free by the FDNY. All applicants are required to apply and pay for an exam online before arriving at the FDNY. It can take about 30 minutes to complete. Simplified instructions for online application and payment can be found here: [http://www1.nyc.gov/assets/fdny/downloads/pdf/business/fdny-business-cof](http://www1.nyc.gov/assets/fdny/downloads/pdf/business/fdny-business-cof)individuals-short.pdf Create an Account and Log in to: [http://fires.fdnycloud.org/CitizenAccess](http://fires.fdnycloud.org/CitizenAccess) ALSO INCLUDED IN THIS BOOKLET YOU WILL FIND THE FOLLOWING: NOTICE OF EXAMINATION (NOE ATTENTION If you already hold a B-28/W-28 COF, you can waive the W-27 exam and only pay the application fee to obtain a W-27 COF. © 07/2022 New York City Fire Department-All rights reserved ® Table of Contents EXAM SPECIFIC INFORMATION FOR W-27 CERTIFICATE OF FITNESS...................................... 5 STUDY MATERIAL AND TEST DESCRIPTION.................................................................................................... 13 INTRODUCTION ................................................................................................................................................... 15 PURPOSE OF FIRE CODE 608....................................................................................................................... 16 PURPOSE OF RULE 3 RCNY 608-01 ............................................................................................................ 16 PURPOSE OF THE STUDY MATERIAL ...................................................................................................... 16 DEFINITIONS ....................................................................................................................................................... 17 CHAPTER 1. CASE STUDIES.......................................................................................................................... 24 CHAPTER 2. HOME STATIONARY ENERGY STORAGE SYSTEMS .............................................................. 25 2.1 Five Types of Energy Storage Technologies ........................................................................................ 25 2.1.1 Lithium-ion (Li-ion) batteries ...................................................................................................... 25 2.1.2 Lithium Metal Polymer batteries................................................................................................... 26 2.1.3 Nickel cadmium batteries .............................................................................................................. 27 2.1.4 Nickel metal hydride (Ni-MH) batteries ....................................................................................... 27 2.1.5 Lead acid batteries......................................................................................................................... 28 2.2 Different Battery Energy Storage Systems Benefits and Hazards ........................................................ 28 2.2.1 Benefits of different Battery Energy Storage Systems .................................................................. 28 2.2.2 Hazards of different Battery Energy Storage Systems .................................................................. 29 2.3 Battery Systems Size Thresholds (only applies to outdoor/rooftop stationary) .................................... 31 2.4 Multiple Battery Systems ...................................................................................................................... 32 CHAPTER 3. PERMITS, ROLES AND RESPONSIBILITIES ........................................................................... 34 3.1 P

FAQs

How can applicants apply for the FDNY W-27 exam?

Applicants must apply and pay for the exam online before arriving at FDNY. The booklet provides instructions to create an account and log in to the FDNY CitizenAccess portal.

Can someone with a B-28/W-28 COF waive the W-27 exam?

Yes. If an applicant already holds a B-28/W-28 COF, they can waive the W-27 exam and only pay the application fee to obtain a W-27 COF.

What topics are included in the W-27 study material?

The study material covers definitions and multiple chapters, including case studies; home stationary energy storage systems and battery technology types; benefits and hazards; permits and responsibilities; and general design and installation requirements for Group R-3 occupancies.

Sep 25, 2026

Uploaded by Angel