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BESANTEK
6. Checking a LOOP tester
Loop tester is an instrument of measuring the resistance of the
main supply. Its measurement is made in Ohm.
Plug the TEST BOX into an unprotected supply (no RCD trip)
and plug the loop tester into the central socket marked 'WIRING
CHECK' on the TEST BOX is shown as below.
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IMPORTANT NOTE:
THE FUSE ON THE RIGHT-TOP OF TEST BOX WILL BLOW IF A
LOOP TESTER IS PLUGGED INTO THE RCD SOCKET WHILE
A LOOP TEST IS PERFORMING.
Loop test switch set on the "SUPPLY LOOP" position on TEST
BOX.
Select the lowest range on the tester and press the test button
on the loop tester. Record the reading (internal resistance
approximate 0.45 ± 0.05 Ohm) on the tester.
Loop test switch set on the opposite position "LOOP+1 R" on
TEST BOX. Select the lowest range on the tester and press the
test button again on the Loop tester. Record the reading is higher
+1 Ohm on the tester.
Allow reading from 1 .400 to 1.500 ± 0.050.
Many testers have both "no trip" mode and normal measurement
mode. Reading should be adopted for both modes.
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