H2scan BSS Catalog 2025 - Flipbook - Page 39
Natural ventilation is the preferred method for maintaining hydrogen levels below the LEL (7.3). Systems
must be designed to account for inconsistent air昀氀ow, backdraft potential, and protection from environmental
factors. It should also be designed to handle worst-case events such as overcharge incidents. The method and
calculation are stated in this section of the standard. If natural ventilation is insu昀케cient based on calculations
and testing, forced ventilation must be implemented and either interlocked with the charger or create an alarm.
Though not required by the standard, hydrogen detection may be used to verify gas accumulation is not occurring
as a method of mitigating risk. By connecting to an interposing relay and fan, the gas purge fan system may
be connected to the hydrogen sensors and automatically activate when levels reach close to 1% hydrogen
(IEEE 1635/ASHRE 21) or (10,000 ppm).
Incidental Contact & Personal Protection (IEC 62485-2 Section 8.2, 8.3, 9)
Battery rooms must be protected from external hazards such as 昀椀re, water, shock, vibration, and vermin.
The standard also requires protection from hazards generated by the battery, including high voltage (shrouds
and shields) >120V, explosions, electrolytes, corrosion, and ground shorts (4.2, 4.3 and 9). Personal protection
equipment (PPE) such as protective eyewear, gloves and aprons are to be kept on-site. Emergency response
kits often contain PPE, and the proper neutralizer based on the battery type for aqueous battery types.
Access to battery rooms should be restricted to authorized personnel. European safety guidelines typically
require personnel entering high voltage areas to have speci昀椀c training before doing so. This training often
covers understanding electrical hazards, safe work practices, and emergency procedures. The exact requirements
can vary depending on local regulations and the type of work involved. Additionally, some regions may require
personnel to obtain certi昀椀cation or authorization to work in high voltage areas. Regular refresher training is
often necessary to maintain competency. Figure 1 lists examples of local directives related to batteries and
electrical safety.
Examples of Directives:
90000266
EU Low Voltage
Directive (LVD)
This directive sets safety requirements for electrical equipment operating
at voltages between 50-1000-VAC or 75-1500-VDC. It includes provisions
related to the design, manufacture, and use of electrical equipment, which
can impact personnel safety.
UK Health and
Safety Executive
(HSE) Regulations
The HSE has various regulations related to workplace safety, including
those speci昀椀cally addressing electrical safety. These regulations often
include requirements for training and competence for personnel working
with high voltage equipment.
German Accident
Prevention
Regulations (BGR)
These regulations, issued by the German Social Accident Insurance
(DGUV), provide guidance on workplace safety, including electrical safety.
They often include requirements for training and competence.
French Labor Code
The French Labor Code contains provisions related to workplace safety,
including those pertaining to electrical hazards. It might specify training
requirements for personnel working with high voltage equipment.
pg.39
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