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Preference on integral sub vs external sub

hi all,

just wondering which everyone’s preference is for large building which require their own DNO substation is and the pros and cons of placing inside opposed to having an external substation

I have only ever done integral substations, but can see the downside of having an external sub as needing drainage in the trench to route the cabling.

What is the general preference 

Thanks

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  • I worked on a brand new house with an internal substation, it caught fire before the owners moved in.

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  • I worked on a brand new house with an internal substation, it caught fire before the owners moved in.

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