Frequently Asked Questions - Cooper Industries

1 Frequently Asked Questions 1. What are the target applications for this line of disconnect 9. Are the disconnect switches operable by flange or side switches ? handle? Some of the applications that are ideal for this line of disconnect switches are Most disconnect switches can be operated with a front, right side, flange or motor control panels, UPS, Food & Beverage, HVAC equipment, or any type of direct mount handle mechanism, which increases flexibility for configuration at electrical panel. the point of use and reduces the need for multiple parts in inventory. 2. What is the difference between UL 98, UL 489 and UL 508? selector handles and pistol handles require different These different UL standards define the application for intended use. The shafts? disconnect switches that are Listed UL 98 or UL 489 are for general purpose, Yes, even though the shafts may have the same length and cross section, the main disconnect , or branch circuit protection. The disconnect switches that end that engages the handle is different for a selector handle and for a pistol are Listed UL 508 are for motor disconnect applications.

2 Handle. A disconnect switch can be converted between selector and pistol handle by replacing the shaft and handle. 3. Why are there two catalog numbers for some disconnect switches with the same amperage and fuse type? it matter which orientation the disconnect switch is Some disconnect switches are available in both a compact and a standard installed? version with different footprint and SCCR. This allows flexibility and control Yes, standard 100-1200A non-fused disconnect switches [Catalog numbers when designing panels. RD100-3-SCCR, RD200-_, RD400-_, RD600-_, RD800-_, RD1000-_ and RD1200-_] may not be installed in a 90 counter-clockwise orientation (see 4. Can the disconnect switches be used as a Service Entrance? image below). They can be installed in a 0 , 90 or 180 clockwise orientation (0 is when the text on the disconnect switch labels are right side up). All Yes, all UL 98 and UL 489 open disconnect switches can be used as a other disconnect switches may be installed at 0 , 90 , 180 , or 270.

3 Service Entrance. All requirements for a Service Entrance should be followed during installations. The enclosed disconnects are not configured to be used as a Service Entrance. 5. Does this line of disconnect switches meet NFPA 79. requirements? All fusible disconnect switches can be configured to meet NFPA 79. requirements for industrial machinery with the appropriate NFPA handle kit. Please refer to the Cooper Bussmann Full Line Catalog to find the appropriate kit. Standard 100-1200A non-fused disconnect switches may not be mounted in the 90 counter-clockwise orientation shown. 6. What types of accessories are available for the disconnect switches ? disconnect switches may be installed in orientations other than vertically on a Easy to install modular accessories including front, right side and flange wall, but require a derating factor Kp to be applied according to the figure operated handles, auxiliary contacts, finger-safe terminal shrouds, switched below. 4th poles and a variety of handle options make it simple to design the disconnect switch for the desired application.

4 All accessories are field installed for open and enclosed disconnect switches . 7. Are the fusible disconnect switches double break? Yes, double breaking is standard on this line of fused disconnect switches . Both the lineside and the loadside of the fused disconnect switch are disconnected when the switch is OFF. This helps ensure complete fuse isolation and reduces hazards to personnel. 8. Can multiple padlocks be used with the rotary disconnect switches ? Example: A 100A disconnect switch mounted horizontally from the ceiling should be derated to 100A X = 90A. Yes, up to three diameter shank padlocks can be placed on all external handles. 0413 BU-SB13417 Page 1 of 2 FAQ: 10075.. Frequently Asked Questions you install a fuse with an amp rating different than what type of protection do the different NEMA ratings provide the fused disconnect switch is rated for? for the enclosed disconnect switches ? Yes, you can install any fuse with the same case size up to the amperage For complete information about NEMA ratings and protection offered by each rating of the disconnect switch.

5 Ex: A Class J 200A disconnect switch can use NEMA type, please visit any Class J fuse from 110A up to 200A. fuse reducers be used with the fused disconnect parts from the current Bussmann line of rotary switches ? disconnect switches be used with parts from a previous Fuse reducers can be used on disconnect switches up to 100A [Catalog Bussmann line? numbers RDF60J-_, RDF60J-_-COMP and RD100J-_]. All other fused No, parts from the current line and previous lines cannot be interchanged. disconnect switches do not allow for the use of fuse reducers. The complete assembly, including disconnect switch, shaft, handle and other accessories must be from the same line. fuses ship with the disconnect switches ? No, fuses must be ordered separately. tools are available to transition the current Bussmann line of disconnect switches ? enclosed disconnect switches , can the enclosure door be opened when the disconnect switch is ON? There is an online cross-reference tool that provides the closest Bussmann equivalent for competitive products as well as the previous Bussmann No, the handle interlock feature on all external front handles prevents the door offering.

6 The cross reference tool can be found at: from being opened when the disconnect switch is in the ON position. However, qualified personnel can override this feature with the use of a tool. All work must be performed by a qualified electrician in accordance with OSHA. regulations and requirements of the latest edition of NFPA 70E. Proper PPE the disconnect switches and accessories stocked must be worn when working on electrically energized systems. products? Yes, the most common open and enclosed disconnect switches and accessories are in stock and ship within 24 hours. Standard lead time for non-stock enclosed disconnect switches up to 200A is two weeks. Contact your local Bussmann Rep for all other standard times. 0413 BU-SB13417 Page 2 of 2 FAQ: 10075.