M4000 Insulation Analyzer User Guide
72A-1230 Rev. F 1-25
July 22, 2005
Safety Precautions
Doble insulation analyzers require operation by at least two persons. The
M4000 Insulation Analyzer operator has his/her own Operator's Safety
Switch. A second switch, called the Extension Safety Switch, is provided. The
cable for the Extension Safety Switch is equal in length to the High Voltage
Test Cable. Both switches are of the spring-release type for quick action. With
either switch off, all voltage to the High Voltage Test Cable is removed. The
person responsible for attaching the High Voltage Test Cable to the specimen
should operate the Extension Safety Switch, and should be positioned so as to
be able to observe all terminals and points of access to the apparatus under
test. If this is not possible, then the out-of-sight terminals should be roped off
with CAUTION labels appropriately placed, and a person posted in the
vicinity to ensure safety.
Each time the test equipment is set up, and prior to making the first test, both
safety switch operators should cooperatively verify the correct operations of
both switches.
It is recommended that the Extension Safety Switch be the last switch closed.
The Extension Safety Switch must remain open until all personnel are safely
in the clear. Personnel should not be allowed to remain on the apparatus
while tests are in progress. If unauthorized personnel should enter the area,
or if some other undesirable situation should develop, the Extension Safety
Switch operator should release the switch immediately, and then notify the
M4000 Insulation Analyzer operator.
The two safety switches are intended to be used as a “dead man” type switch.
Both safety switches should be used at all times. Never short circuit them
and do not use fixed mechanical locking devices for depressing the switch
button. The switch button must be manually operable at all times.
The M4000 operator and the operator's assistant should follow a uniform
system of visual and verbal signals in order to prevent confusion during the
testing process. For example, when the test connections have been completed
and all personnel are in the clear, the operator's assistant should make visual
contact with the M4000 operator and call “ready”. The M4000 operator,
before bringing up the test voltage, should acknowledge the assistant's signal,
and advise all present by calling out “coming hot”. Upon completion of the
test, the operator should call out, “all clear”. To demonstrate further that the
test has been completed, it is good practice for the M4000 operator to extend
the Operator's Switch at arm's length with the button released, for all to see.
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