3
they may not have the same safety features built in.
1.16User of this equipment and/or their employers are
reminded that Health and Safety Legislation require them
to carry out valid risk assessments of all electrical work so
as to identify potential sources of electrical danger and risk
of electrical injury such as from inadvertent short circuits.
Where the assessments show that the risk is significant
then the use of fused test leads constructed in accordance
with HSE guidance note GS38 Electrical test Equipment for
use by Electricians should be used.
2
Features and Principles of Measurement
2-1 Features
▲
KT42 with ATT avoids the need to by-pass most passive
RCDs
▲
Large high contrast display
▲
Auto lock out if test resistor overheats
▲
Voltage indication
▲
Microprocessor controlled
▲
Measures PSC
▲
Measure low loop with 0.01
Ω
resolution
▲
High loop ranges permit measurement of ground spikes
▲
Bright colour coded LED mains status indicators
▲
Distribution board lead included as standard
2-2 Principles of Measurement (Fault Loop Impedance)
If an electrical installation is protected by over-current protec-
tive devices including circuit breakers or fuses, the earth loop
impedance should be measured.
In the event of a fault the earth fault loop impedance should be
low enough (and the prospective fault current high enough) to
