UL 508 Standards Water Environmental Association of Texas

UL 508 Standards Water Environmental Association of Texas (WEAT) Seminar Kenneth A. Stone Senior Automation Specialist January 18, 2017

AGENDA 1. UL vs. NEMA 2. UL 508, 508 A, and 508 C 3. OPEN vs. ENCLOSED

UL vs. NEMA

What is the difference between a NEMA Classification and a UL Type rating?

NEMA - Definitions Example – NEMA 4 (Water and Dust Tight)

UL Type TESTED and CERTIFIED to meet a definition Example – Type 4 (Water and Dust Tight)

UL 508 Related UL Standards

508 Standard for Industrial Control Equipment 508 A Standard for Industrial Control Panels 508 C Standard for Power Conversion Equipment 508 B Outline of Investigation for Relays used in Information Technology (IT) Equipment 508 E Outline of Investigation for IEC Type 2 Coordination Short Circuit Tests of Electromechanical Motor Controllers in accordance with (IAW) with IEC Publication 947 -4 -1 508 I Systems Outline of Investigation for Disconnect Switches Intended for Use in Photovoltaic

UL 508 These requirements cover industrial control devices, and devices accessory thereto, for starting, stopping, regulating, controlling, or protecting electric motors. These requirements also cover industrial control devices or systems that store or process information and are provided with an output motor control function(s). This equipment is for use in ordinary locations in accordance with the National Electrical Code, NFPA 70. • Devices for controlling or protecting electric motors. • Devices that store or process information for controlling or protecting electric motors.

UL 508 A • UL 508 A These requirements cover industrial control panels intended for general industrial use, operating from a voltage of 600 volts or less. This equipment is intended for installation in ordinary locations, in accordance with the National Electrical Code, ANSI/NFPA 70, where the ambient temperature does not exceed 40°C (104°F) maximum. Industrial Control Panels using UL 508 devices

UL 508 C • UL 508 C These requirements of open or enclosed equipment that supplies power to control a motor or motors operating at a frequency or voltage different than that of the input supply. These requirements cover powersupply modules, input/output modules, Silicon Controlled Rectifier (SCR) or Transistor output modules, dynamic braking units, and input/output accessory kits for use with power conversion equipment. Power Conversion that uses UL 508 devices

What is the relationship between UL 508, UL 508 A, and UL 508 C?

MOTOR CONTROL DEVICES

MOTOR CONTROL DEVICES Power Conversion Devices

MOTOR CONTROL DEVICES Industrial Control Panels Power Conversion Devices

UL 508 C UL 508 A

OPEN vs. ENCLOSED

Enclosure Labels What do these labels tell us? Enclosed vs. Open Enclosed – An Industrial Control Panel provided with an enclosure AT THE FACTORY. “CABINET” Open – An Industrial Control Panel that includes internal wiring, field wiring terminals, and components mounted on a subpanel without a complete enclosure. The enclosure is intended to be supplied/completed AT THE INSTALLATION. “BACKPLANE”

PRACTICAL APPLICATION

“ 19. 5 No covering is required across the bottom of a floor mounting enclosure when the lower edge of the enclosure is within 6 inches (152 mm) of the floor and when live parts within the device are at least 6 inches above the highest portion of the lower edge of the enclosure. Section 19 – Enclosure Openings UL 508 A STANDARD FOR SAFETY Industrial Control Panels ”

PANEL MOUNTING TECHNIQUES Free-Standing Floor Mount Wall Mount Pedestal Mount

“ 19. 5 No covering is required across the bottom of a floor mounting enclosure when the lower edge of the enclosure is within 6 inches (152 mm) of the floor and when live parts within the device are at least 6 inches above the highest portion of the lower edge of the enclosure. Section 19 – Enclosure Openings UL 508 A STANDARD FOR SAFETY Industrial Control Panels ”

PANEL MOUNTING TECHNIQUES Free-Standing Floor Mount Wall Mount Pedestal Mount

QUESTION: How far from the ground must the lowest live part be mounted in a freestanding enclosure such that no gland plate is required for openings in the bottom of the cabinet?

“ 19. 5 No covering is required across the bottom of a floor mounting enclosure when the lower edge of the enclosure is within 6 inches (152 mm) of the floor and when live parts within the device are at least 6 inches above the highest portion of the lower edge of the enclosure. Section 19 – Enclosure Openings UL 508 A STANDARD FOR SAFETY Industrial Control Panels ”

ANSWER: 12 inches Backplane 6+6 = 12” 6” 6” FREE-STANDING ENCLOSURE Floor

RESOURCE for QUESTIONS:

Thank you! PANEL DISCUSSION