Introduction and overview

The Integrated Single Phase (ISP ED) meter is a compact,
two wire, keypad-based prepayment electricity meter
in a housing compatible with the ESKOM standard
common base electricity dispensersocket.

This meter is most suited to new reticulation and is
directly and easily interchangeable with common base
prepayment meters from other approved manufacturers
using the common base configuration.

User interaction with the meter and access to meter
information (such as a low credit warning, energy
consumption, and load contactor status) are available
using the keypad and LCD display.

Principle of Operation

The ISP ED meter is based on the ESKOM Specification, which calls for a prepayment meter that can be fitted into a standard, plug-in common base. This concept ensures simple installation and replacement procedures.

The meter is keypad based, fully STS compliant and supports the 20 digit STS encryption algorithms. The meter has a wide range of information registers which can easily be accessed by pressing the information button on the keypad and then entering the number of the register.

More detailed information and programming is achieved via the standard ESKOM VTC interrogation port at the rear of the meter


      • Single phase, 2 wire, common base meter
      • Maximum rated current (Imax) 60 Amps (80 Amp model available on request)
      • Scrolling display for the meter serial number
      • Display last 50 vouchers entered (Displays 20 digit value and date & time of voucher)
      • Mechanically sealed against tampering
      • Magnetic tamper detection
      • Tamper detection facility, detects removal from common base (Optional on request)
      • Clip-in anti-tamper sealing plugs for ease of installation in the field
      • Significant Reverse Energy (SRE) detection
      • Programmable software power limit
      • Degree of protection, IP54
      • Meter enclosure manufactured with UV stable, flame-retardant plastic material
      • Information button and backspace key
      • Supports ESKOM short codes
      • Advanced commissioning feature
      • Clear, language-independent icons
      • Latch status indicator icon
      • Improved sealing against ingress of insects
      • Custom label space for utility specific labels
      • Proven keypad technology
      • SANS 1524-1 certified
      • Easy to install and ideal for new reticulation
      • Fully STS compliant
      • 28 additional meter parameters accessible via the information key and selected registers

Anti-tamper features

The ISP is mechanically sealed against tampering through the use of a factory-sealed screw plugs on the rear panels and a utility-sealed wire seal on the front of the meter. The use of these mechanical seals ensures that there are visible signs of tampering if unauthorised entry to the system is attempted.

While the standard ISP ED model does not have a mechanical anti-tamper facility fitted, meters with this facility are available on request.

The tamper facility automatically detects if the meter is removed from the common base. This condition will set the tamper condition thereby opening the latching relay when the meter is re-fitted to the base.

The meter includes a Significant Reverse Energy (SRE) detection feature. If the line and load wires are swapped during installation, the meter will continue to operate and decrement credit, however, the meter can be factory-programmed to tamper and disconnect the load should SRE be detected.

Plug-in base

The plug-in-base, which also conforms to ESKOM’s specifications, allows the commissioning of the meter to be separated from the installation of the wiring, thereby adding flexibility and installation convenience. Included with the base is a Metal Oxide Varistor (MOV), which ensures that the meter complies with SANS IEC 61643-1 for class 3 arrestors. The base is optional and can be supplied separately to the meter.

(click for more info - ISP ED Specifications - "allow time for page to load" )