|
ZONE No.
1 |
Usually no
adverse reaction. |
|
ZONE No.
2 |
Usually no
harmful physiological effects, reaction current >0.5mA, 'let-go'
current about 10.5mA. |
|
ZONE No.
3 |
No organic
damage. Likelihood of muscular contraction and difficulty of
breathing, reversible disturbances of impulses in the heart,
transient cardiac arrest without ventricular fibrillation increases
with current magnitude and time. |
|
ZONE No.
4 |
In addition
to effects of zone No.3 probably of ventricular fibrillation
increasing with current magnitude and time, pathyphysiological
effects such as cardiac arrest, breathing arrest and heavy duty
burns likely. Risk of fire eminating from faulty electrical equipment
producing current less than that able to operate MCB or fuse
increases with increasing current (long term deterioration). |
|
ZONE No.
5 |
Area relating
to residual current and time where most disturbances emanating
from appliances and installed services may be found (from results
of mains monitoring and recording). |
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