Is there an applicable code reference for minimum distance between a fire hydrant and a transformer?
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8 Comments
Pete H
7/19/2022 06:40:36 am
This write up by Mike Ruff at TES Engineering describes some clearance requirements, but doesn't source them to code. They do sound decent though.
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DW
7/19/2022 08:06:19 am
Depends if the transformer is a Autobot or Decepticon.
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Ray Jackson
7/19/2022 08:41:16 am
In this day and age, it's really hard to tell which is which. All I can say for certain is, "Autobots, roll out!!!"
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Jesse
7/19/2022 08:07:22 am
Can't think of a code of hand, but common sense should prevail.
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Adam Jensen
7/19/2022 09:06:44 am
In Ontario, the local monopoly is Hydro One. They have their own set of Standards that apply to the installation of their equipment. As far as Code goes, I don't see any references.
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Danial Bartle
7/19/2022 09:24:45 am
NFPA 1 (2021) 18.5.7 indicates clear space in general is 36in (914mm) in circumference and 60in (1524) in front of each connection greater than 2 1/2. I did not see a reference for the transformer, but it may be in NFPA 70 (NEC)
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Franck
7/19/2022 09:44:42 am
If the purpose is to access the hydrant to use it in case of transformer fire, I would suggest to use the safe separation distances from NFPA 850 which depend on the oil quantity in the transformer (could be 5 ft, 25 ft or 50 ft minimum - 1.5, 7.5 or 15 m).
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Ryan L Hinson
7/19/2022 10:09:40 am
NFPA 850 Section 7.4 provides some guidance regarding maximum hydrant spacing in general hydrant spacing for electric generating plants and high voltage direct current conversion stations...which includes discussion regarding transformers. Spatial separation of transformers and other equipment containing over 500 gal of oil is to be in accordance with Section 6.1.4 - Outdoor Oil-insulated Transformers, per Section 9.7.10. While hydrant location is not specifically addressed, consideration of access during firefighting operations in conjunction with spacing between transformers and other structures (including firewalls or fire barriers) and reachability by at least one hose stream per Section 12.3.7.3 should be included in any hazard evaluation.
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