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Discussion Starter #1
I want to add a circuit but have a full fuse panel, can i take out a 15A fuse, and install and 30A fuse and wire the subpanel to the 30A fuse and install to 15A circuits to the subpanel?
 

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That fuse panel has to be +40 yrs old, I think it is time to replace it, since buss and fuse connections deteriorate over time. And you may not have add a sub panel, but if it is for a different location, it will be much simpler with a new breaker panel.
 

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Discussion Starter #3
I'm planning on changing the panel in the future, i want to add the sub panel for the mean time. Can i do that by taking out a 15A fuse and installing a 30 fuse for a sub panel?
 

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A sub panel generally has a 240 volt feed. That will require two fuses to be used as the feed.
I don't see any problem with your plan other than two fuse are needed.
 

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While 120/240 volt sub panel are certainly the norm, I do not believe there is a specific prohibition against a 120 volt sub. If you proceed, I would plan on the ultimate use of this sub, and provide a panel and cabling (4 wire feeders with enough slack to move to new main panel) based on the ultimate use. Also insure the neutrals and grounds are kept separate in the sub.
 

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A single phase panel has 2 hots and a neutral, the term "2 phase" is kind of confusing. Your picture shows a single phase panel. Two phase power generation is basically obsolete, but 2 phase is sometimes used for control circuits in 3 phase systems. At any rate, what comes to your home is single phase while some commercial power is 3 phase.
 
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