Polarity Wiring Test

Polarity Wiring Test Points : Polarity Wiring Test, Using Megger, Using continuity tester, Using test lamp A test has to be made to verification of polarity of all single pole switches, including switches on socket-outlets -and fuses are connected to phase wire and that there is no break in the conductors. For lighting circuit all the lamps, should be removed, the main switch is in ON position, all the fuses are connected in circuit and all the switches is in OFF position: (a) Using test lamp: One way of doing this test is by means of a portable lamp or test lamp. One terminal of the test lamp is connected to the main switch neutral terminal and the other placed against a terminal in the switch when the switch is ON. If the switch is correctly connected the test lamp will fully light and if there is no light the polarity is incorrect. In that event the test may be repeated on each terminal with the switch OFF. If the switch has been connected to the neutral wire and the lamp directly on the live or phase wire, the test lamp light at about half brilliancy on one terminal as it will be in series with the fixed lamp. This test s performed only on the supply.

For socket-outlets a test should be made with test lamp connected to the ‘L’ and E’ terminals of a plug. ‘“When the plug is inserted into a socket-outlet, if socket is correctly. connected, then the test lamp will light at full brilliance.

In case of switched socket-outlet is should give light only then the switch on the socket-outlet is in the ON position.

(b) Using continuity tester: If the supply is not present then the continuity tester is used for performing of test. The procedure of polarity test to using continuity tester is same as test lamp. The one terminal of the test lamp is connected to switch fuse phase terminal and the other terminal is connected to each switch terminal one by one. If the switches are connected to the phase wire then lamp will give light if the switch is connoted to the neutral wire (he lamp will not give the light in this condition change the terminal wire of the switch.

(c) Using Megger: Polarity test can be performed by using megger. The testing Leads of the of the megger are successively connected to the switch fuse terminal and by with each switch terminal one by one. Turn the megger handle at a steady Constant speed of about 120rpm. If the megger scale shows the zero ohm reading it means the polarity is correct and if will give the infinity ohm reading. it means the polarity is incorrect.