However, if your facility’s panels were built and listed under the 3rd Edition, you may need the 3rd Edition for maintenance or replacement parts evaluation.
: Offers an overview of important changes and design additions specifically for the 3rd Edition. ul 508a 3rd edition pdf better
The 3rd edition introduces smarter rules for . Previously, every door on a multi-door enclosure had to be interlocked with the main disconnect switch. Now, only the door providing access to the disconnect switch itself must be interlocked. This provides: However, if your facility’s panels were built and
: Builders can quickly find the most up-to-date compliance path for specific items like resistors and reactors through digital summaries. 3. More Flexible Door Interlocking Rules ul 508a 3rd edition pdf better