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C AT III
3Æ distribution, such as switchgear and p• o• l • y• p•h•a•s•e• •m• o• t• o•r •s• • i •n• •f •i• x•e• d• •i•n•s•t•a•l•l•a•t•i•o•n•s•.• • •
Three phase systems in Cat III environments
• Confirm the test instrument is rated for the use. — drives are typically considered CAT III
• Use proper PPE—always.
• Combining CAT III instruments with lower rated accessories.
• Short circuiting floating differential test points with a common ground non-isolated multichannel input device.
• Holding the meter during testing.
Prop it up or hang it up.
Do Avoid
P ers onal protec tive equipment
Use PPE per NFPA70E
Tip: While there are a lot of “non-contact” meters that do not require
direct connection to contacts, proper PPE for the area must still be worn.