HellermannTyton ACADEMY T419, Вопросы и ответы

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E-mail: sales.jhb@hellermann.co.za | Website: www.hellermanntyton.co.za
QUESTION 7a: WHAT INSTRUMENT CAN BE USED TO TEST CONTINUITY OF ALL BONDING
CONDUCTORS?
ANSWER: Any insulation tester similar to:
a) Toptronic MacroG3
b) Toptronic T1151
c) T89
QUESTION 7b: HOW IS THE TEST DONE AND WHAT VALUE OF MEASUREMENT IS ACCEPTABLE?
ANSWER: a) Set the instrument to be used on RESISTANCE. (ohms).
b) Short the instrument test leads together (including any extension leads) and
make a note of the reading on the instrument.
c) To test, connect one test lead to the earth bar in the distribution panel and the
other test lead to the test point (each geyser, gutter, aerial and other exposed
conductive parts of the installation) and make a note of this reading
(see fig. A - Pg 3).
d) Subtract previous reading (b) from this reading (c) to get the required reading.
e) This reading shall not exceed 0.2
Ω
. (see note on table 8.1 on page 276 of code
of practice). SANS 10142
f) All points must be tested.
QUESTION 8a: WHAT INSTRUMENT CAN BE USED TO TEST THE RESISTANCE OF THE EARTH
CONTINUITY CONDUCTORS?
ANSWER: Only use insulation resistance testers:
a) Toptronic T1132
b) Toptronic MacroG3
c) Toptronic T1832
d) Toptronic T1151
e) T89
2
1 2
Rated current of
protective device
A
Maximum resistance of
earth continuity path Type of Instrument
6.3
10
16
1.7
1.1
0.70
T1132
T1800
T1832
T1151
T89
T53
T418
T419
MacroG3
20
25
32
0.55
0.53
0.41
40
50
63
0.33
0.26
0.24
80
100
125
0.19
0.14
0.12
160
200
250
315
0.096
0.077
0.062
0.049
T4137
NOTE - in the case of metallic roofs, gutters, downpipes and waste pipes
(See 6.13.2.4). The resistance of the earth continuity path shall not exceed 0,2 Ω
Table 1 - Maximum Resistance Of Earth Continuity Conductor