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How to Use a Solderless Breadboard
Written By: John R. Sewell

New international safety Categories provide a quick guide to safe use of Test Meters in general usage and their built-in protections (fusing, overvoltage protection, operator isolation) as set in IEC61010-1. This standard is recognized by most Country safety authorities.

This specification is designed to provide Shock/burn/arc limiting for the operator NOT the meter.

Cat I: are circuits not connected to Mains (Batteries, loose resistors, bulbs, cables, LEDs, portable radio)

Cat II: are circuits used with Single Phase Mains sub circuits. (Connected by Plug as a Radio, Toaster, lamp, washing machine)

Cat III: Danger of Arc/Flash is present. Measurements in permanently installed (Hard wired) locations connected to Mains (Lighting, pumps, outlets)

Cat IV: High energy Arc/Flash Danger is present. Measurements in utility service entrance mains panels, transformers and where short circuit current levels can be very high.

CATGORY III & IV: Testing/measurements should be only carried out by highly trained, experienced personnel with all the required safety equipment cited in the NEC (National Electrical Code)
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