We have had similar experiences in FL particularly after the hurricane hit south of Miami. Electrical requirements changed and immersion became a common requirement for some of our customers. We use "W" insulation as standard and recommend sealing the bottom entrances to the equipment. This normally satisfies the AHJ. [email protected] on 09/26/2000 08:02:58 AM Please respond to [email protected] To: [email protected] cc: (bcc: Ed Rauch/MAIN/MC1) Subject: NEC This question is in regard to Class 2 and 3 circuits according to the US National Electrical Code. Reference note 2 in Table 11(a)., Class 2 and Class 3 Alternating-Current Power Source Limitations which says, "For nonsinusoidal ac, Vmax shall not be greater than 42.4 volts peak. Where wet contact (immersion not included) is likely to occur, Class 3 wiring methods shall be used or Vmax shall not be greater than 15 volts for sinusoidal ac and 21.2 volts peak for nonsinusoidal ac." The Code has a clear definition of a wet location, but there is no definition of "immersion". The code is clear that a concrete slab at ground level is considered to be a wet location. Any non-water tight conduit installed in the slab would also be considered to be a wet location (my interepatation). We now have an electrical inspector in Florida stating that such a conduit location is an "immersion" area since it is well known that water will be present. Therefore; this must be taken into consideration when classifying the circuits Class 2 or 3 and using the proper cables. Has anyone else run into this interpretation? Richard Woods Richard Woods ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: [email protected] Michael Garretson: [email protected] For policy questions, send mail to: Richard Nute: [email protected] ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: [email protected] Michael Garretson: [email protected] For policy questions, send mail to: Richard Nute: [email protected]
