This document describes various tools and instruments used for electrical installation and maintenance. It outlines pull-push rules for measuring length, wire gauges for determining wire sizes, vernier calipers and micrometers for precise linear measurements, and various meters - including voltmeters, ammeters, ohmmeters, clamp testers and multi-testers - for measuring voltage, current, resistance and ensuring safety. Additional tools mentioned include test lights, megger insulation testers, phase sequence testers and galvanometers.

1. MEASURING TOOLS AND
INSTRUMENTS
ELECTRICAL INSTALLATION AND MAINTENANCE

2. PULL PUSH RULE
•Pull-Push Rule is a
measuring tool used to
measure the length of an
object in centimeter and
inches

3. Wire Gauge
Wire Gauge is used in
determining the size of
wires/conductors. The
gauge ranges from 0 to 60
awg ( American wire
gauge).

4. VERNIER CALIPER
•a linear measuring
instrument consisting of a
scaled rule with a
projecting arm at one
end, to which is attached
a sliding vernier with a
projecting arm that forms
a jaw with the other
projecting arm.

5. Micrometer
Micrometer is used to
measure the diameter of
wires/conductors in circular
mils. It can measure small
and big sizes of wires and
cables.

6. Test Light
•Test Light is a pocket size
tool used to test the line
wire or circuit if there is
current in it.

7. VOLT METER
•Voltmeter is an
instrument used to
measure electrical
pressure or voltage of a
circuit. The unit of
measure is volt (v). This
is connected across or
parallel to the circuit.

8. AMMETER
Ammeter is an instrument
used to measure the amount
of electrical current intensity
in a circuit. The unit of
measure is ampere (a). It is
connected along or series to
the circuit.

9. OHM METER
•Device used
to measure
resistance

10. Clamp Tester
Clamp Ammeter is also
called tong-tester. It is
used to measure current
flowing in a conductor. It is
clamped or hanged in a
conductor

11. MULTI-TESTER
• Volt-Ohmmeter (VOM)
otherwise called as Multi-
tester; is used to measure
the voltage, resistance and
current of a circuit. It is
connected in parallel or
series with the circuit
depending on what to
measure.

12. Megger
Megger insulation tester is a
small, portable instrument that
gives you a direct reading of
insulation resistance in ohms or
megohms. For good insulation,
the resistance usually reads in
the megohm range

13. Phase Sequence Tester
Phase sequence meter
is used for detecting
the sequence of the
supply in three-phase
electric circuits

14. GALVANOMETER
•An instrument for
detecting and measuring
small electric currents