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Electrical contractor 37 years. Electrical inspector 2 years
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As stated above, a service is a service. Temporary, residential, commercial. Only one disconnect in a panel now. As for back feeding the 100 amp circuit breaker, this might not work. Many MLO panels have ratings for the largest branch circuits or in this case you would be back feeding. It might just be cheaper to replace it with a 100 amp main breaker 12 circuit panel.
The fact that the inspector just listed "service disconnect" now makes you look up in the code book which would help the electrician learn. She could have listed and spelled out what was wrong but would you remember it the next time? Now you are asking questions and looking into the book. I am sure you will remember this.
 

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Electrical contractor 37 years. Electrical inspector 2 years
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3,081 Posts
In order to do a service ONE TIME, whether a permanent or temporary it is best to look up your current utility specifications and follow them, instead of waiting for the suspector to tell you it's wrong, or worse yet asking online from people outside of your area. Each utility and municipality can have differing requirements, it's always best to determine the requirements up front, before you buy any materials and waste time and money. Charge the customer for the research time, instead of you eating the time and materials for something that won't pass or get connected.

Here is a couple snippets from my local utility's greenbook for an example. Notice that the verbiage says to follow Article 230. That means there is no special allowances for temporary services as suggested earlier in this thread. Whatever code cycle your area has adopted needs to be followed, not what some guy on the internet say's. If your still unclear on the local requirements, it would be smart to stop in and ask your local suspector directly or the service planner if the field conditions are different from their specifications. Once you know the actual requirements, then you should pass the first time and every time thereafter with no waste of time or materials. And charge the customer for your knowledge, because that is what it takes to get the job done efficiently.

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Very good fact based comment. Your utility has a "green" book? We have a utility " red" book but it really gray in color. Maybe we should partition for a code change and call it a gray book.
 
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