IEEE -Std 1100 has been revised to 1999 version.
What is this "specification" going to be used for?
You mention electricians - this would be a construction or material specification.
By "Architect" I assume you mean an Architectural Engineering firm - or Consulting Engineering firm - involved in producing drawings and specifications for bidding and construction of data centers. This "specification" would be in the form of a design guidelines or facility standards that the engineer would use in designing the systems for you.
In either case, coming up with good design guidelines or construction specifications for data centers is a complex process and is not "generic". I would recommend you hire an experienced consulting engineer to help you develop these documents.