Control panel design guide according UL 508A
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Control panel design guide F:T*N Powering Business Worldwide

Feeder Main Feeder Main Multi-Load Panel Feeder Main Feeder Main See Page 4 Feeder Main Feeder Main Single Motor Panel Branch Protection Branch Branch Protection Protection Branch Branch Protection Protection Branch Branch Protection Protection Branch Protection Branch Protection Branch Protection Transformer Transformer or Power or Controller Power Supply Supply Overload Protection Overload Protection Controller Controller Controller Controller Controller Controller Controller Controller Overload Protection Overload Overload Protection Protection Overload Overload Protection Protection...

Feeder Main Individual Circuit for Motor Load Heater or Lighting Lead Power Circuit Wiring Control Circuit Single Motor Load Individual Circuit for Motor Load Group Motor Group Motor EATON CORPORATION Control panel design guide Single Motor Load Control Circuit Power Circuit Wiring Heater or Lighting Lead Feeder Main

Sizing the feeder Reference to UL 508A Section 32.3.1a Example Multi-Load Panel 125A + 3.4A + 7.6A + 14A + 20A + 2A = 172A Use closest size, 175A Transformer or Power Supply Overload Protection Overload Protection Overload Protection Overload Protection Motor Load Motor Load Motor Load Motor Load Heater Load Transformer Load (Primary Side) The feeder amp rating is sized based on the sum of the amp rating of the largest branch protective device plus the full-load currents of the other loads. In this example, the 125A circuit breaker is the largest shortcircuit protective device. This value...

Feeder Main Fulfilling key requirements of relevant North American standards Main disconnect switches (Circuit Breakers and Molded Case Switches) equipped with door mounted rotary handles, and installed in industrial control panels for industrial machinery applications, essentially require the use of an additional internally mounted supplementary handle in order to meet all of the requirements found in the relevant North American standards dealing with this application. Eaton’s assortment of new supplementary handles meet these stricter requirements in both the UL 508A and NFPA 79...

rated current circuit breaker fuse acc. Molded Case main switch assembly kit with additional NEC/CEC Switch rotary handle Part no. SCCR SCCR SCCR SCCR SCCR SCCR black red-yellow EATON CORPORATION Control panel design guide Complete assortment -> www.eaton.eu/ecat

Feeder Main UL 489 Circuit Breaker and Molded Case Switch Selection circuit breaker fuse acc. Molded Case main switch assembly kit with additional NEC/CEC Switch rotary handle Complete assortment -> www.eaton.eu/ecat EATON CORPORATION Control panel design guide

circuit breaker fuse acc. Molded Case main switch assembly kit with additional NEC/CEC Switch rotary handle EATON CORPORATION Control panel design guide Complete assortment -> www.eaton.eu/ecat

Feeder Main 1 Switch-disconnector; circuit breaker; circuit breaker for North America; Molded case switches for North America 2 IP2X protection against contact with a finger 3 Terminal cover, knockout 4 Terminal cover 5 IP2X protection against contact with a finger 6 Tunnel terminals 7 Box terminals 8 Control circuit terminal 9 Connection width extension 10 Adapter plate 11 Busbar adapter 1 2 Spacer 13 Standard auxiliary contacts, trip-indicating auxiliary switches 1 4 Rear operator 15 Main switch rotary handle for side panel mounting 16 Door coupling rotary 17 handle 18 Extension shaft 19...

Group motor design Reference to UL 508A Section 31.4.1.c Circuit Breaker 175A Transformer or Power Supply Overload Protection Overload Protection Overload Protection Overload Protection Motor Load Motor Load Motor Load Motor Load Heater Load Transformer Load (Primary Side) Group Motor – Multiple Motors Protected by a Single Set of Fuses or Breaker The following rules apply to manual motor controllers for motor loads only: A single set of fuses or breaker can be used if the following conditions are met: 1. All power circuit devices are rated for group motor use as indicated on the component,...

Group Motor PKE Manuel Motor Protector MSC Manuel Motor Controller Special considerations for Manual Motor Controllers and Motor Starters in North America The motor protection is described in detail in NEC Article 430. Basically for all motor circuits the 4 functions are required: • Disconnect (main switch) • Short-circuit protection • Operational switching (contactor) • Overload protection. Whitepaper download: www.eaton.eu/publications This functions can separately incorporate equipment or might be combined in one device. EATON CORPORATION Control panel design guid

EATON CORPORATION Control panel design guide Complete assortment -> www.eaton.eu/ecat

Group Motor Motor-protective circuit breaker PKE 12/32 Motor-protective circuit breaker PKE 65 Motor-protective circuit breaker PKZM01 Undervoltage release/shunt release Feeder terminal block Trip-indicating auxiliary contact Side mounted auxiliary contact PKE-XZMR electronic overload relay module Door-coupling rotary handle and shaft extension Front mounted auxiliary contact SmartWire-DT communication interface for PKE Combination plug-in connector Mechanical plug-in connector Motor starter link Electrical plug-in connector Electrical plug-in connector 17 Contactor up to 15 A 18 Contactor...

Individual circuit for motor load Reference to UL 508A Section 31.3, 33.2, 34.2, 66.8 Circuit Breaker 175A Transformer or Power Supply Overload Protection Overload Protection Overload Protection Overload Protection Motor Load Motor Load Motor Load Motor Load Heater Load Transformer Load (Primary Side) Individual Circuit for Motor Load There are several ways to build a branch circuit for a motor load. Each method provides short-circuit protection, motor overload protection, and the ability to start and stop the motor. Some additionally provide a means to disconnect the branch circuit for...

Individual Circuit for Motor Load UL 508 Type E/F combination motor controllers (MSC) are self-protected and do not limit the upstream protective devices. 2-Component Combination Motor Controller Solutions for North America Motors are by far the most important pieces of equipment in the machine tool and panel building industry. There are essentially 2 traditional approaches involved in switching and protecting such motors. One uses fuses as the primary overcurrent protective device. The other is fuseless, and relies on motor protective switches or circuit breakers as the core protective...