grounding of raised floor
grounding of raised floor
(OP)
my company is designing the electrical system for a building. this building, an administration and classroom building for a local college, has a raised floor over the entire floor to receive LEED credits and facilitate easier distribution of communication cabling. it is not a dedicated computer room.
does this raised floor need to be grounded? we think it does per nec 250.104.D.2. it appears it does and that this grounding connection is required just at one point for "each separately derived system" and not all through out the floor.
does this raised floor need to be grounded? we think it does per nec 250.104.D.2. it appears it does and that this grounding connection is required just at one point for "each separately derived system" and not all through out the floor.






RE: grounding of raised floor
If for some reason the structure is not interconnected, then there are two solutions: Run a separate bonding jumper for each structural assembly (my words, not in the code) to the system grounding point. Or electrically bond the structural sections together. There may be cases in which it is desirable to mechanically isolate structural elements. In this event, flexible bonding jumpers can interconnect them.