publicgood
Senior Member
- Location
- WI, USA
I found notes about not using post tension rods as down leaders - this makes good sense. It goes on to speak of bonding and separation. I see notes in NFPA 780 and UL96 for side flash calculations. Also references in IEEE Green book about side flashing.
My question: UFC is the only place I've seen references specifically to post tension systems on this topic. Does anyone know of another standard or have direct experience on this subject?
3-5.6 Post Tension Systems.
On construction utilizing post tension systems to secure precast concrete sections, the post tension rods shall not be used as a path for lightning to ground. Provide down conductors on structures using post tension systems; down conductors shall have sufficient separation from post tension rods to prevent side-flashing. Bond post tension rods to the lightning protection and grounding systems only at the base of the structure; perform this bonding in accordance with the recommendations of the post tension rod manufacturer.
https://www.wbdg.org/FFC/DOD/UFC/ufc_3_575_01_2012.pdf
My question: UFC is the only place I've seen references specifically to post tension systems on this topic. Does anyone know of another standard or have direct experience on this subject?
3-5.6 Post Tension Systems.
On construction utilizing post tension systems to secure precast concrete sections, the post tension rods shall not be used as a path for lightning to ground. Provide down conductors on structures using post tension systems; down conductors shall have sufficient separation from post tension rods to prevent side-flashing. Bond post tension rods to the lightning protection and grounding systems only at the base of the structure; perform this bonding in accordance with the recommendations of the post tension rod manufacturer.
https://www.wbdg.org/FFC/DOD/UFC/ufc_3_575_01_2012.pdf
