Just getting 18” above the tray doesn’t alleviate the tray from being an obstruction to the discharge pattern of the sprinklers. It’s a little more complicated than that.
Also, is this actually tray or ladder racking, one is solid the other is open. How wide is the tray? If is actually rack, how densely packed is it going to be? Cable trays can be any size and can actually end up needing sprinklers below just like you’d do with HVAC duct. Craig Prahl | Jacobs | Fire Protection SME – EV, AM, DC, Special Hazards [email protected]<mailto:[email protected]> | www.jacobs.com<https://urldefense.com/v3/__http:/www.jacobs.com/__;!!KZTdOCjhgt4hgw!-_khxU8gU0_6jc895I7kRbnU8JghRDsWgqOblZ4jr7Qp2IVbR30VYw_hWvNFtphnl0uWpB9KIvbYi1pvZz4$> 1041 East Butler Road Greenville, South Carolina 29606 CONTACT BY: Phone 1-864-676-5252, Email or MS TEAMS From: Anthony Carrizosa <[email protected]> Sent: Tuesday, February 11, 2025 12:22 PM To: Discussion list on issues relating to automatic fire sprinklers <[email protected]> Subject: [EXTERNAL] [Sprinklerforum] Re: Server room Can you ask them to raise the ceiling a few inches to get you a minimum of 18” above the cable tray? Other wise tell them you have to add sprinklers below the cable tray and right on top of the servers. That should get them to be willing to Can you ask them to raise the ceiling a few inches to get you a minimum of 18” above the cable tray? Other wise tell them you have to add sprinklers below the cable tray and right on top of the servers. That should get them to be willing to move the ceiling up. Anthony Carrizosa Project Manager | Fire Protection 7855 S 206th St Kent, WA 98032 Cell: 206-679-5283 | Office Dir: 253-341-4593 [cid:[email protected]] From: Tim Easter <[email protected]<mailto:[email protected]>> Sent: Tuesday, February 11, 2025 9:06 AM To: Discussion list on issues relating to automatic fire sprinklers <[email protected]<mailto:[email protected]>> Subject: [Sprinklerforum] Server room I have a server room that is 10' ceiling. The cable tray sits atop the servers at 8-8". I plan on using NFPA 13, 2022 edition, section 10.2.7.3.2.3 and figure 10.2 7.3.2.3. What does it mean in figure, "center of partition less than 12"? Servers are larger than 12", so I cannot use this method? Must resort to 3* rule? ________________________________ NOTICE - This communication may contain confidential and privileged information that is for the sole use of the intended recipient. Any viewing, copying or distribution of, or reliance on this message by unintended recipients is strictly prohibited. If you have received this message in error, please notify us immediately by replying to the message and deleting it from your computer.
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