As posed, your question has no content, cannot be connected with any particular engineering field, or to a geographic region, to mandatory codes for the industry or locality, to standard protocols, etc., at any level better than guesswork. I've said it before: most of us here do not claim to be telepathic. Even for those who are, it will only work if YOU transmit a coherent signal. You did not. I advise starting over with an entirely new post containing an actual question, because no one will have bothered to subscribe to this one.
I apologize if this sounds harsh - but you need to understand why you are not being helped. Why, in fact, we CANNOT help.
* [Meaning, "Please explain your three- and four-letter acronyms."]
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" Ignorance and arrogance have more in common than their last four letters. "
RCCB
Re: RCCB
