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Safety precautions /
~
CAUTION
which are inherently resistant to being corroded
or
are suitably protected
against being so corroded.
6-9
Checks
to
electrical devices
• Repair and maintenance to electrical components shall include initial safety
checks and component inspection procedures.
•
If
a
fault
exists that could compromise safety, then no electrical supply shall be
connected to the circuit until
it
is satisfactorily dealt with.
•
If
the
fault
cannot be corrected immediately but it is necessary
to
continue
operation, an adequate temporary solution shall
be
used.
• This shall be reported to the owner
of
the equipment so all parties are advised.
• Initial safety checks shall include:
- That capacitors are discharged: this shall be done in a safe manner
to
avoid
possibility
of
sparking;
- That there no live electrical components and wiring are exposed while
charging, recovering
or
purging the system;
- That there is continuity
of
earth bonding.
7. Repairs
to
sealed components
• During repairs to sealed components, all electrical supplies shall be
disconnected from the equipment being worked upon prior to
any
removal
of
sealed covers, etc.
•
If
it
is absolutely necessary to have an electrical supply
to
equipment during
servicing, then a permanently operating form
of
leak detection shall be located
at
the most critical point to warn
of
a potentially hazardous situation.
• Particular attention shall be paid
to
the following to ensure that by working on
electrical components, the casing is not altered in such a
way
that
the level
of
protection is affected.
• This shall include damage to cables, excessive number
of
connections,
terminals not made to original specification, damage
to
seals, incorrect fitting
of
glands, etc.
• Ensure
that
apparatus is mounted securely.
• Ensure
that
seals
or
sealing materials have not degraded such that
they
no
longer serve the purpose
of
preventing the ingress
of
flammable atmospheres.
• Replacement parts shall be in accordance with the manufacturer's
specifications.
NOTE:
The use
of
silicon sealant may inhibit the effectiveness
of
some types
of
leak detection equipment. Intrinsically safe components do not have to be
isolated prior
to
working on them.
8.
Repair to
intrinsically
safe
components
•
Do
not
apply
any
permanent inductive
or
capacitance loads
to
the circuit
without ensuring
that
this will not exceed the permissible voltage and current
permitted
for
the equipment
in
use.
• Intrinsically safe components are the only types that can be worked on while
-7-
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