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6600 COUNTS DIGITAL MULTIMETER
USER'S MANUAL
Overvoltage
In brief
category
CAT
Electronic
Single-phase
CAT
receptacle
connected loads
Three-phase
distribution,
CAT
including
single-phase
commercial lighting
Three-phase at
utility connection,
CAT
any outdoor
conductors
* When using this Multimeter, the user must observe all normal safety rules concerning:
protection against the dangers of electric current.
protection of the Multimeter against misuse.
* For your own safety, only use the test probes supplied with the instrument. Before use, check that they are in good
condition.
2
Examples
• Protected electronic equipment.
• Equipment connected to (source) circuits in which measures are taken
to limit transient overvoltages to an appropriately low level.
• Any high-voltage, low-energy source derived from a highwinding
resistance transformer, such as the high-voltage section of a copier.
• Appliance, portable tools, and other household and similar loads.
• Outlet and long branch circuits.
• Outlets at more than 10 meters (30 feet) from CAT III source.
• Outlets at more that 20 meters (60 feet) from CAT IV source.
• Equipment in fixed installations, such as switchgear and polyphase
motors.
• Bus and feeder in industrial plants.
• Feeders and short branch circuits, distribution panel devices.
• Lighting systems in larger buildings.
• Appliance outlets with short connections to service entrance.
• Refers to the "origin of installation"; i.e., where low-voltage connection is
made to utility power.
• Electricity meters, primary overcurrent protection equipment.
• Outside and service entrance, service drop from pole to building, run
between meter and panel.
• Overhead line to detached building, underground line to well pump.
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