Using the wrong test instrument on a live circuit can result in damage to the tester as well as initiate an arc flash event. Test meters must be rated for the type of circuit and voltage level.

ASTM F1796 covers portable, live-line tool-supported, direct-contact type capacitive voltage detectors to be used on electrical systems both indoors and outdoors for ac voltages from 600 V to 800 kV with frequency of 60 Hz.

According to Section 7.1.2 in the ASTM standard, the voltage range, manufacturer information and a general statement regarding any use precautions or limitations shall be permanently marked on each unit.

According to Section 8.1 of the ASTM standard, the manufacturer shall clearly specify the limits of performance of each voltage detector within the instructions as follows:

8.1.1 Operating voltage range or ranges,

8.1.2 Operating temperature range,

8.1.3 Operating humidity range,

8.1.4 Storage temperature range,

8.1.5 Storage humidity range, and

8.1.6 Any limitations in use.

Below is a sample of NFPA 70E. For the complete section, see the actual NFPA 70E text at NFPA.ORG. Once there, click on the free access link to NFPA 70E.

110.8 Test Instruments and Equipment.

(A) Testing. Only qualified persons shall perform tasks such as testing, troubleshooting, and voltage measuring on electrical equipment where an electrical hazard exists.

(B) Rating. Test instruments, equipment, and their accessories shall be as follows:

(1) Rated for circuits and equipment where they are utilized

(2) Approved for the purpose

(3) Used in accordance with any instructions provided by the manufacturer

(C) Design. Test instruments, equipment, and their accessories shall be designed for the environment to which they will be exposed and for the manner in which they will be utilized.

(D) Visual Inspection and Repair. Test instruments and equipment and all associated test leads, cables, power cords, probes, and connectors shall be visually inspected for external defects and damage before each use. If there is a defect or evidence of damage that might expose an employee to injury, the defective or damaged item shall be removed from service. No employee shall use it until a person(s) qualified to perform the repairs and tests that are necessary to render the equipment safe has done so.