New UL 2735 Electric Utility Meter Standard Ensures Safety and Performance

meter fireIn the past, design flaws in smart meter units have been known to cause serious fire hazards and spotty performance. This has caused a lot of concern for utilities and manufacturers of smart meters. To prevent problems like this, a new voluntary safety standard – UL 2735 – has been created for electric utility meters.

In the past, meters were tested to UL/CSA 61010-1, as was other Measurement, Control, and Laboratory Equipment.  Meter manufacturers are increasingly migrating from UL 61010-1 to UL 2735.

UL 2735 covers:

  • Meters rated up to 600V which measure, monitor, record, transmit, or receive electrical energy generation or consumption information
  • Socket mounted plug-in (Type S) utility meters, and non-socket mounted, bottom connected (Type A) utility meters
  • Meters provided with one or two-way communication capabilities by means of carrier signals, telephone, cable, or wireless communication
  • Meters that provide signals, directly or wirelessly, for the control of electrical loads or electrical power generation equipment

These construction and performance requirements are included in UL 2735:

Components

  • Compliance with relevant component standards
  • Used within their recognized ratings
  • Includes plastics, PCBs, MOVs, wire, and transformers

Electrical

  • Accessibility of hazardous live parts
  • Electrical spacings over-surface and through-air
  • Isolation of current transformer secondary
  • Endurance of load control switch
  • Single component fault

Fire

  • Polymeric enclosure flammability
  • Battery protection, charging, placement and replacement
  • Single component fault

Mechanical

  • Enclosure environmental considerations
  • Enclosure strength and rigidity
  • Access panels
  • Static
  • Impact
  • Drop

ANSI C12.1

  • Insulation resistance
  • HV line surges
  • Fast transient/burst
  • RF interference
  • RF conducted/radiated emissions
  • Temperature rise
  • Temporary overload
  • Electrostatic discharge

Markings

  • Environmental suitability
  • Electrical ratings
  • Installation instructions
  • ANSI C12.10 nameplate
  • Permanence and legibility

UL 2735 is not yet part of the NRTL Program, however MET Labs is already accomplished in testing to it. Learn more about MET’s highly-regarded testing of meter safety, reliability, and accuracy for manufacturers or utilities.

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