E-mail: [email protected] | Website: www.hellermanntyton.co.za
14
k) Avoid backfilled areas as the ground has not been compacted and rubble might
influence the reading.
l) The above test should only be performed if an earth is provided. (Earth at the
installation).
QUESTION 13a:
WHAT INSTRUMENT CAN BE USED TO TEST INSULATION RESISTANCE?
ANSWER:
An installation tester like the:
a) Toptronic MacroG3
b) Toptronic T1132
c) Toptronic T419
d) Toptronic T1151
QUESTION 13b:
HOW IS THIS TEST DONE AND WHAT VALUE OF MEASUREMENT IS ACCEPTABLE?
ANSWER:
a) Set the test voltage on the insulation tester to twice that of the system voltage
(500 volts for a normal 230VAC system).
b) Disconnect the power to the installation, the earth leakage circuit breaker and
other electrical/electronic devices which could be damaged during the test.
c) All switches and circuit breakers must be in the on position.
d) Set the insulation tester to 500V and connect the test leads as required (For
example: phase to phase, phase to neutral, phase to earth, etc).
e) Depress the “push-on” button and note the insulation resistance reading
indicated by the instrument.
f) Infinity is preferred but a minimum of 1M ohm will be accepted.
QUESTION 14a:
WHAT INSTRUMENT CAN BE USED TO TEST THE VOLTAGE (MAIN DB) WITH NO LOAD?
ANSWER:
Any meter with voltage function similar to:
a) Toptronic TBM811
b) Toptronic TBM251
c) Toptronic TBM3030
QUESTION 14b:
HOW IS THIS TEST DONE AND WHAT VALUE OF MEASUREMENT IS ACCEPTABLE?
ANSWER:
a) Switch off all loads and measure the voltage at the point of control
(the distribution board).
b) If the voltage is out of regulatory limits notify the supplier by
completing Annexure K (see Addendum D - Pg 16).
c) The regulatory limit of the supply voltage is 230 VAC ±10%.
QUESTION 15a:
WHAT INSTRUMENT CAN BE USED TO TEST THE VOLTAGE (MAIN DB) WITH THE LOADS
SWITCHED ON?
ANSWER:
Any meter with a voltage function similar to:
a) Toptronic TBM811
b) Toptronic TBM251
c) Toptronic TBM3030
QUESTION 15b:
HOW IS THE TEST DONE AND WHAT VALUE OF MEASUREMENT IS ACCEPTABLE?
ANSWER:
a) Switch on the maximum loads available and measure the voltage at the point of
control (distribution board).
b) The stove and geyser could be used as loads if available.
c) If the voltage measured is out of regulatory limits notify the supplier by completing
Annexure K (see Addendum D – Pg 16).
d) The regulatory limit of the supply voltage is 230 VAC ±10%.
QUESTION 16a:
WHAT INSTRUMENT CAN BE USED TO TEST THE VOLTAGE AT THE AVAILABLE LOAD
(WORST CONDITION)?
ANSWER:
Any meter with a voltage function similar to:
a) Toptronic TBM811
b) Toptronic TBM3030
Summary of Contents for ACADEMY T419
Page 1: ......
