Electrical Branch Circuit Analyzers

Product Name

SureTest® THD

SureTest® Digital

SureTest® ProPlus


FAQ - Voltage Drop A day in the life of a copier repairman


Branch Circuit Standards
Description Normal Range Comments
Line Voltage 108 – 132 Low or high voltage will harm equipment.
% Voltage Drop@ 15 Amp. Load <5.0% NEC Part. 210-19, FPN 4. Excessive voltage drop can cause fires. (test for 15 amp. Circuit)
% Voltage Drop@ 20 Amp. Load <5.0% NEC Part. 210-19, FPN 4. Excessive voltage drop can cause fires. (test for 20 amp. Circuit)
Voltage between neutral and ground < .5 Volts Higher voltages upset microprocessor operation. Can often be noise.
Phase Conductor Impedance <.25 Ohms IEEE recommends less than .25 Ohms from any outlet to the building entry.
Neutral Conductor <.25 Ohms IEEE recommends less than .25 Ohms from any outlet to the building entry.
Ground Conductor Impedance <.25 Ohms IEEE recommends less than .25 Ohms. Critical for proper operation of surge protection devices.