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About this Webinar

The anticipated 2017 National Electrical Code  (NEC) will include several sections with new short-circuit protection requirements. The most significant changes will require that the available fault current  at the location where the equipment is installed is marked/documented and dated. These changes will allow installers, inspectors and approvers to verify that the installed equipment short-circuit current rating (SCCR) is equal to or greater than the available fault current, and compliant with the other code sections dealing with equipment

installations.

 

In this Webinar, you will understand the Eaton advantage in meeting the 2017 National Electric Code Changes as it relates specifically to Short-Circuit Current Ratings.

 

What is SCCR?

 

Short-Circuit Current Rating (SCCR) is the amount of current an industrial control panel can safely withstand during the event of a short circuit. The panel SCCR should be greater than or equal to the fault current (the amount of current present during a short circuit).

 

Short-Circuit Current Rating (SCCR) is the amount of current an electrical component or assembly is able to safely withstand in the event of a fault when properly applied. SCCRs apply to almost all industrial control panels used for operating machinery and equipment. The Occupational Safety and Health Administration (OSHA) and the National Electrical Code® (NEC®) require sufficient short-circuit current protection of industrial control panels to protect equipment and personnel from certain risks in the event of a short-circuit (fault) event. Protection from fault current events is often properly specified and applied in electrical switchgear and distribution equipment (such as panel boards and switchboards), but it is often misunderstood or misapplied when it comes to machinery and industrial control panels.

 

 

 

 

Proposed Changes to the 2017 NEC®

 

Equipment short-circuit protection has been in place since 2005. Proposed changes to 2017 NEC® regarding available short-circuit current include:

  • 409.22 (B). Available short-circuit current shall be documented for industrial control panels
  • 440.10 (B). Available short-circuit current shall be documented for HVAC
  • 620.51 (D). Available short-circuit current shall be marked for elevator control panels
  • 670.5. Available short-circuit current shall be marked for industrial machinery
  • 430.99. Available short-circuit current shall be documented for  motor control centers

 

The proposed changes cover the following types of equipment:

 

  • Marking requirements
  • The available short-circuit current shall be marked on the following equipment types:
  • Machinery
  • HVAC Equipment
  • Elevator Control Equipment
  • Generator Equipment
  • Transfer Equipment
  • Energy Storage Equipment
  • Battery Systems Equipment
  • Documentation requirements
  • The available short-circuit current shall be documented for the following equipment types:
  • Motor Control Centers
  • Equipment with Industrial Control Panels

 

Why this Webinar is Important

A short-circuit current rating (SCCR) represents the maximum level of fault current that the control panel or machinery can safely withstand. The NEC® requires that industrial control panels, industrial machinery and HVAC equipment be marked with an assembly SCCR that is greater than the fault current at the location where the equipment is installed. Inspectors and installers need this information in order to ensure compliance with NEC® 110.10.

 

 

Adequate SCCR is imperative for a safe electrical system. If the available fault current of the system exceeds the equipment SCCR and a short-circuit occurs, catastrophic damage to the panel may occur. Electrical workers and others are put at risk of injury from burns, flying debris and electric shock. Nearby equipment is also at risk of damage and the improperly installed piece of equipment can cause fines or commissioning delays.

 

 

Panels with insufficient assembly SCCR that are subjected to a short-circuit event can expose personnel and equipment to serious danger. Without sufficient assembly SCCR, it is likely that the devices inside the panel will sustain and cause damage within the panel, and it’s also possible that damage may extend outside the panel.

 

 

Insufficient assembly SCCR poses the following hazards:

 

  • Electric shock and burns
  • Burns associated with arc flash and contact with heated
  • surfaces
  • Injury associate with flying debris
  • Damage to equipment or the facility
  • Arc blast (shock waves, shrapnel, etc.)
  • Vaporized metal

 

 

 

To help ensure a safe system, personnel and equipment, SCCRs must be properly understood and implemented. This seminar will help you learn about the proposed changes to SSCR requirements.

The Presenter

Presenter's Name: Thomas Domitrovich P.E., LEED AP

 

Thomas Domitrovich is Vice President, Technical Sales, Eaton corporation, Bussmann Division.

Webinar Recording