Electrical Ring Main Circuits: How to Test Them

 Australia was the first and is now is presumably the only country in the world that still uses the 30 amp ring system for wiring socket outlets in electrical installations. The ring main circuit has long been the subject of numerous heated discussions between electrical experts, but as an electrician, you will no doubt need to test them in the course of your duties. Then's an overview of Ring Main examination and electrical tagging procedures.

Warning- Please note that this is a' dead' test so the distribution board, consumer unit, or circuit must be insulated from the electrical force. To begin with, you will need to carry out a Safe Insulation Procedure and get authorization to turn off the force.

Then is the testing procedure

Insulation Resistance

Dissociate all appliances and accessories from the ring circuit and carry out sequestration tests between the Line, Neutral, and Earth CPC.

End to End Ring Continuity Test

Set your test cadence to a low resistance range and zero the test leads. Measure the resistance of ring durability of each of the live, neutral, and earth captain ring circles. Record these end-to-end readings for future reference and entering onto a test distance. Note that where the earth operators are lower, the resistance will be advanced. For illustration for binary and earth lines1.5 mm will be1.66 times advanced than2.5 mm.

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Super Loop Test L&N

Cross-connect the live and neutral operators from contrary ends of the ring and form a super loop. However, try drawing the live and neutral circles of a ring circuit on a piece of paper with the contrary ends connected If at first, this sounds confusing. You will see that it forms one big super circle.

Test resistance between the ends you have just connected. The reading taken between the super circle ends should be about half that of your former durability reading. You can also corroborate the ring main wiring and connections by going to each socket outlet and testing between living and neutral. Where the socket is on the ring and the connections are' good', your readings should be within0.05 of your original super circle reading at the distribution board.

These readings aren't typically recorded but will form the base for your assessment of the ring main circuit connections.

High readings could indicate that the socket is on a spur from the ring, that connections need tensing or that the socket is defective giving a poor connection to the draw and needs replacing. Where the readings aren't harmonious this could indicate that there are cross-connections and the ring circuit has been bridged.

Super Loop Test L&E

Cross-connect the line and earth operators from contrary ends of the ring and form a super circle. Test between the two sets of ends you have just connected. The resistance reading should be about half that of your former durability reading. You can also corroborate the ring main wiring and connections by measuring the resistance at each socket outlet as for Live and Neutral described preliminarily. Testing between life and earth at the sockets also checks for correct opposition.

Read More:-https://thelocalguystestandtag.com.au/blog/how-to-test-and-tag-appliances/

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