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Thread: Nec 2014 Buck Boost Transformer

  1. #1
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    Nec 2014 Buck Boost Transformer

    I have 240V load for cooking in kitchen single phase but my service is 208V/120V. I am going to ise 208V single phase to 240V single buck boost Larson MT-BBT-208V-240V-23.4A transformer. However, what NEC Article section talks about grounding this sort of transformer?

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  2. #2
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    Jun 2018
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    Glen bunie, md, us
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    Quote Originally Posted by hhsting View Post
    I have 240V load for cooking in kitchen single phase but my service is 208V/120V. I am going to ise 208V single phase to 240V single buck boost Larson MT-BBT-208V-240V-23.4A transformer. However, what NEC Article section talks about grounding this sort of transformer?

    Sent from my SM-G935U using Tapatalk
    Ok so I found 450.5 but that says connected to 3 phase ungrounded system and its for autotransformer but I have buck boost transformer. Other than that Article 250.30 but thats for separtely derived system not for buck bost transformer. So. I am still not sure what to use. Manufacturer instruction say ground per NEC. Its confusing.

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  3. #3
    Join Date
    Feb 2003
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    Connecticut
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    Quote Originally Posted by hhsting View Post
    Ok so I found 450.5 but that says connected to 3 phase ungrounded system and its for autotransformer but I have buck boost transformer. Other than that Article 250.30 but thats for separtely derived system not for buck bost transformer. So. I am still not sure what to use. Manufacturer instruction say ground per NEC. Its confusing.

    Sent from my SM-G935U using Tapatalk
    Try 250.110

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