Phil, Here is a link to the applicable physical planning guide with requirements:
http://bitsavers.informatik.uni-stuttgart.de/pdf/ibm/370/fe/GC22-7064-13_Input_Output_Equipment_Installation_Physical_Planning_Mar93.pdf Look on page 112. When I worked for IBM in the 1970s I saw a few running in offices sometimes with a 3803 sometimes without. Usually with the channel or control unit cables snaked under or through a wall. The intent was to keep people out of the mainframe room. Also, they required 3-phase electricity and the floor had to checked to make sure it could support the weight. Standard building codes specify how much weight an office floor must support and it was much less than the 3803/3420's weight so a licensed engineer had to certify that that particular floor could support its weight. Dr. Harry J. Wahl ________________________________ From: IBM Mainframe Discussion List <[email protected]> on behalf of Phil Smith III <[email protected]> Sent: Wednesday, June 25, 2025 9:19 AM To: [email protected] <[email protected]> Subject: 3420 environmentals? Anyone remember whether 3420s had to be in a chilled room or not? Could you have had one in a regular office? I forget how much heat they put out. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
