Please read: If there is an accident, please call 888. (1)
If there is a fire, ring the bell. (2)
1/ (1) has the same meaning with : (A) or (B)?
A.In case of accident, please call 888.
B.In case of an accident, please call 888.
After “In case of +noun”, we use or don’t use an article?
What is the difference in meaning btw (A) and (B)(both are correct or only one of them is correct?)? Is there a rule?
Your question is really whether or not you use the indefinite article with fire and accident. Fire can be conflagration in a general sense, then it will not usually have an articles or it can be a collection of flames, then it will attract an article. Accident is a countable noun and the usually rules apply.
I can only repeat that if you want to ask questions, then you should spend a little time looking at the explanations before you send off another question. The sentence:
that you have posted does not chime with the explanation I gave because this is not an example of a general use of the word ‘fire’ it is a specific use of the word and in effect means as I have already said, a collection of flames and so it follows that you would say: If there is A fire …
I must admit I find it very irritating the way you repeat the same questions over and over again and you take no notice of an explanation.