Q: Generate the answer for a given question. The question requires common knowledge of English. Make sure that the answer is in detail, long, consistent with the context, and requires general knowledge of English. To be less repetitive, please vary your language for each question. Give a proper explanation to answer, and if necessary, provide the definition of various terms. And conclude your answer if it's long. If you have used other resources (e.g., Merriam Webster's.) to answer the question, include citations in your answer. You don't need to paraphrase the context of your resources, but make sure that your answer is consistent and complete.
I know that 'ad hoc' is a Latin phrase and I've typically seen it used without a hyphen. However, many technical articles use a hyphen. For example: Ad-hoc mode is useful for establishing a network where wireless infrastructure does not exist or where services are not required. Is 'ad hoc' always the correct usage? If it can be 'ad-hoc', is the usage of the hyphen specific to certain circumstances?.
A:
The rule-of-thumb I've found in researching this issue, (though no reference to a specific style guide was referenced one site linked here) is if Latin and other foreign phrases are not hyphenated in their original language, then they are not hyphenated in English.