Amprobe MEGATEST-1000 Megohmmeter - Manual (Page 34)

Test b):
Connect the
instrument test
leads to the
electrodes placed
on the floor at a
reciprocal
distance of one
meter
Test b):
Connect one test lead
of the instrument to the
equalizing potential
node and the other to
one of the electrodes
placed on the floor at
distance higher than
one-meter way from
earthen objects.
Equalizing potential node
Measurements of floor insulation resistance in medical rooms
The electrodes shall consist of a plate having a surface of 3 square inches (20 cm
2)
,
weight equal to approx. 2.2 lbs. (1 Kg) , and a humid absorbing paper (or humid thin
cotton cloth) with the same surface placed between the metal plate and the floor.
The insulation resistance is represented, both for the measurements indicated in "a"
and for the measurements indicated in "b", by the average of 5 or more tests taken
in different positions at a distance higher than 1 m away from earthed objects.
ALLOWABLE VALUES
The maximum values of the calculated resistance are the following:
- 1 M# for measurements taken on a ## new floor.
- 100 M# for the periodical tests taken ## after the first year as from the floor
realisation and for the periodical check every 4 years.
All the values shall be registered on a protocol of the initial tests (64-4 5.1.02) and, for
the periodical controls, on the register of periodical tests (64-4 5.2.02).
33