UL 1449 4th Edition Announced

Effective March 2016, Underwriters Laboratories Inc. (UL) has announced the release of UL 1449 4th edition covering low voltage AC power surge protection devices. The latest refinements of the testing and product marking allow DEHN’s Type 1 Component Assemblies to fit the larger market needs for lightning current SPDs.

DEHN is committed to providing solutions meeting these updated requirements with our easy to use product selector and installation guidelines.

Look for our DEHNguard and DEHNbloc Type 1 component assembly SPD’s suited to be installed between the utility meter and first service disconnect breaker.

The SPD types as defined by UL:

SPD TypeCoverage
Type 1
  • Permanently connected SPDs intended for installation between the secondary of the service transformer and the line side of service equipment.
  • Installed without the use of external overcurrent protective device
Type 2
  • Permanently connected SPDs intended for installation on the load side of the service equipment overcurrent device
Type 3
  • Point-of-utilization SPDs

  • Installed at a minimum conductor length of 10 metres (30 feet) from the electrical service panel

Type 4
  • Component assembly consisting of one or more Type 5 components (typically MOV or SASD)

  • Must comply limited current tests and In

  • Not tested as standalone devices to intermediate and high current faults

Type 5
  • Discrete component surge suppressors such as surge components (MOV or SASD)

  • May be mounted on a PCB connected by leads

  • Can be utilized within an enclosure with mounting means and wiring terminations

  • Not tested to low, intermediate or high fault currents

  • Must be mounter within another enclosure

Testing Requirements for type 4 and 5 SPDs:

Test Criteria

Type 4 SPD

Type 5 SPD

I Leakage (initial)

Required

Required

Dielectric Voltage Withstand

Required

Required

Vn (Before and After IN)

Required

Required

Measured Limiting Voltage (MLV)

Required

Required

Disconnector

Required

Not Applicable

Limited Current

Required

Not Applicable

Grounding Continuity

Optional

Optional

Fault and Overcurrent

Optional

Optional

Insulation Resistance

Optional

Optional

The marking includes:

  • Manufacturer Name
  • Catalog Number
  • SPD Type
  • Electrical ratings
  • Nominal discharge current (In) Rating
  • Maximum continuous operating voltage rating (MCOV)
  • Voltage protection rating (VPR)
  • Measured limiting voltage (MLV)
  • Date or period of manufacture
  • Short circuit current rating (SSCR)

 

DEHN Inc. June 1, 2016