Kyoritsu Electrical Instruments Works KEW 4506, Instruction Manual

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When testing wiring systems such as TT system, which has high
total earth resistance (resistance between N-E is 2 Ω or higher),
you just need KEW 4506 and measure resistances of earth pole (E)
and neutral wire (N) to check N and E are wired properly.
To test wiring systems with low resistances such as TN, building
structure, and common earth systems, connect KEW 8343 to
the location close to the branch circuit breaker to which 3P outlet
under test is wired and apply test voltage. See “ 5. Wiring system ”
described in the instruction manual for KEW 8343.
6-1-3 Socket test procedures
KEW 4506 conducts test in the following procedures.
V
L-N
: Voltage between L-N
V
L-E
: Voltage between L-E
V
N-E
: Voltage between N-E
V
MAX
: The maximum voltage among L-N, L-E, and N-E
●
: Measured voltage is 70% or higher than V
MAX
.
* : Measured voltage is less than 70% of V
MAX
.
RE : Resistance of earth pole (E)
RN : Resistance of neutral wire (N)
RNE : Resistance between neutral wire (N) and earth pole (E)