Standard Non Fused Disconnect Sizes Nec

The 2011 nec clarifies that the branch circuit overcurrent device can serve as the disconnect for appliances if they are not over 300va or 1 8 hp 422 31 a.

Standard non fused disconnect sizes nec. Local fuse indication lights are standard optional wired remote open fuse indication can be utilized to signal a plc and open a contactor to de energize all phases if required. Transformer secondary conductors if they meet the requirements of 240 21 c. Use page 70 57 9 or tables 4 and 5 if wires are all different size. After circuits have been derated to get proper wire size use table 3a if wires are all same size.

The disconnect switch must also have the correct fuse size. For a great many code cycles the standard sizes of fuses and fixed trip circuit breakers used throughout the nec were listed in paragraph form in section 240 6 a. The nec defines in sight as visible and not more than 50 feet 15 24 m distant article 100 definitions. All sizes are compact heavy duty 600 v disconnect switches.

Select a disconnect switch with the same or greater horsepower rating as the appliance. Mcp breakers for motors 125 or next larger size standard breaker sizes are listed page 70 74 240 6 nec conduit sizing 1. Non fusible disconnect switches abb s non fusible disconnect switches are designed to offer maximum versatility to meet specific customer requirements. Don t forget about additional standard sizes for fuses which are listed in the parent text of section 240 6 a.

A new table was added in article 240. An appliance requiring a 30 amp double circuit breaker will need a disconnect rated to its horsepower and will accept two 30 amp fuses. Non fusible 30 200 3 yes e class j r and t available in many instances with the use of adapter kits listed on page 28 1 8. 350 351 16 100a base din rail mount non fusible.

Ground wires should be run with all branch circuits. Non fusible disconnect switch overview. The national electrical code nec for example requires that a disconnecting means shall be located in sight from the motor location and the driven machinery location article 430 102 b. The basic construction provides flexibility safety and high performance in an extremely compact size.

F nema type 12 enclosures 30 1200 a can be field modified to meet nema 3r rainproof requirements when a factory provided drain screw is removed.