Enclosed Hydrogen Equipment - Safety

Note: The scope for this NOI (originally published on November 30, 2021) was updated by the responsible SDO on April 25, 2023.

Note: The scope for this NOI (originally published on November 30, 2021) was updated by the responsible SDO on August 29, 2023.

1 Scope

1.1 Inclusions

This standard applies to assemblies of hydrogen equipment integrated into an enclosure such as a freight container or custom enclosure, i.e. enclosed hydrogen equipment. 

This standard applies to enclosures with a minimum of 7.4 m² (80 ft²) floor area and up to 41.8 m² (450 ft² ) floor area. The floor area of the EHE is considered to be calculated from the outer most walls of the EHE regardless if the EHE contains internal compartments.

This standard applies to enclosed hydrogen equipment intended for stationary outdoor installation.

This standard primarily addresses the safety requirements related to hydrogen and its use inside an enclosure. 

Notes:

1) In other words, this standard applies to both the equipment and the enclosure i.e., the combination of the hydrogen equipment and the enclosure it is integrated into. 

2) The equipment enclosure can be a custom-built enclosure or a modified freight container, such as an ISO 1496 container.

3) ISO containers conforming to ISO 1496 have floor areas within the range noted in Clause 1.1.

1.2 Exclusions

1.2.1 Products covered by a product safety standard

This standard does not apply to products covered by one of the following product safety standards:

1. stationary fuel cell power system, which are covered by CSA/ANSI FC 1* CSA C22.2 No. 62282-3-100;
2. Portable fuel cell power system, which are covered by ANSI/CSA America FC 3;
3. Fuel cell modules with enclosures, which are covered by CSA/ANSI FC 6 or CAN/CSA C22.2 No. 62282-2;
4. electrolyzers, which are covered by CSA/ANSI B22734;
5. dispensers , which are covered by CSA/ANSI HGV 4.1; and
6. compact hydrogen fueling stations, which are covered by CSA/ANSI HGV 5.2 or CSA IR 3-18.

Note: The standards referenced in Clause 1.2.1 include requirements for the equipment enclosure.

1.2.2 Other equipment

This standard also does not apply to:

1. gas cabinets that are installed in accordance with and comply with the requirements of NFPA 2 Section 6.19;
2. exhausted enclosures that are installed in accordance with and comply  with the requirements of NFPA 2 Section 6.20
3. unenclosed hydrogen equipment installed in a room or building; or
4. hydrogen equipment placed in shipping containers or custom enclosures solely for the purpose of transportation or temporary storage.