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ALLOWABLE VALUES
The test result is positive when the insulation resistance indicates values higher or
equal to those indicated in the table reported in the section relative to insulation tests.
Notes:
• SELV system: is a system of category zero or very low safety voltage featured by:
Power supply: autonomous source (ex. batteries, small generator) or safety (ex.
safety transformer).
Protection separation to other electrical systems (double or reinforced insulation or
a metal screen connected to the earth).
There are no earth points (insulated from the earth).
• PELV system: is a system of category zero or very low safety voltage featured by:
Power supply: autonomous source (ex. batteries, small generator) or safety (ex.
safety transformer).
Protection separation to other electrical systems (double or reinforced insulation or
a metal screen connected to the earth).
There are earthed points (not insulated from the earth).
• Electrical separation: is a system featured by:
Power supply: insulation transformer or autonomous source with equivalent
features (ex. generator).
Protection separation to other electrical systems (insulation not lower than that of
the insulation transformer).
Protection separation to the earth (insulation not lower than that of the insulation
transformer).
6.4
MEASUREMENT
MEDICAL ROOMS CEI 64-4
PURPOSE OF THE TEST
Check that the floor is made of material whose insulation resistance complies with the
requirements of the standards CEI 64-4 (3.05.03).
INSTALLATION PARTS TO BE CHECKED
The test shall be taken between:
a)
Two electrodes whose distance to each other shall be one meter.
b)
One electrode on the floor and the equalising potential node.
OF
FLOOR
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INSULATION
RESISTANCE
IN
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