Broken Neutral Safety Device SYSTEM


Patent no: PPN00001981

The unit is designed to detect a broken neutral condition from the incoming supply.

Once a broken neutral condition is detected, the unit forces the RCD (Residual Current Device or Earth Leakage) to operate and isolate the single-phase load from the incoming supply.

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Operation

The unit is designed to detect a broken neutral condition from the incoming supply.

Once a broken neutral condition is detected, the unit forces the RCD (Residual Current Device or Earth Leakage) to operate and isolate the single-phase load from the incoming supply.

Without this device, a broken neutral condition will go undetected and create an unsafe environment with a high risk of electrocution. The device also ensures all appliances that are connected to the single-phase load are protected from broken neutral overvoltage conditions.

Specification

  • Current limitation to 30mA at 230V with RCD
  • Does not operate for load unbalanced voltages
  • Overvoltage Protection (250V MOV)
  • Blue 1.5mm² - Source Neutral wire (300mm)
  • Black 1.5mm² - Load Neutral wire (300mm)
  • Green/Yellow 1.5mm² - Earth wire (300mm)
  • Fire retardant resin coating
  • Unit Dimension: 70mm(L) x 50mm(H) x 25mm

Installation

  • Installations must be done by an authorized person certified to work on electrical low voltage (230V) network installations.
  • Before installation commences the RCD (Earth Leakage unit) must be tested by pushing the trip test button. Failure for the RCD to operate under test conditions must stop the process of installation until the RCD has been replaced and tested for correct functionality.
  • Step 1 – Test the RCD for correct operation.
  • Step 2 – Measure incoming supply between Phase and Earth and Neutral and Earth.
    • Phase-Earth should be 230V
    • Neutral-earth should be very close to 0V (If greater than 10% of supply notify authority i.e. 23V)
  • Step 3 – Isolate the incoming supply by tripping the RCD.
  • Step 4 – Measure the load side to confirm that the supply is dead and that the RCD is working correctly.
  • Step 5 – Install the BNSD in the distribution box as follows:
    • BLUE wire to incoming SOURCE NEUTRAL on RCD
    • BLACK wire to outgoing LOAD NEUTRAL on RCD
    • GREEN/YELLOW wire to EARTH BAR in distribution box.
  • Step 6 – Once installed reset the RCD and measure supply voltages to be healthy.
  • Step 7 – The RCD should be stable and should not trip under normal conditions.
  • NOTE: LOAD MUST BE CONNECTED FOR DEVICE TO OPERATE CORRECTLY
  • IMPORTANT: ENSURE EARTHING IN DISTRIBUTION BOX COMPLIES TO SPECIFICATIONS
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