Seaward PAC 1500Xi - Manual (Page 3)

INTRODUCTION & DESCRIPTION
The PAC1500Xi is an advanced portable appliance checker which performs tests on
Class 1 or Class 2 equipment. These tests are Earth Bond Resistance and Insulation
Resistance as required by the Electricity at Work Regulations 1989. The equipment is
controlled by solid state electronics and enables the user to easily select and perform
the required tests.
Particular features of the specification are;
Tests Class 1 and Class 2 equipment.
Allows Earth Bond measurements to be conducted at low currents (100mA).
Earth Bond currents are electronically controlled for accuracy and safety.
Clear digital display with electronic hold of last reading at end of test.
Additional BS4343 socket for testing 110V appliances.
Layout
The PAC1500Xi is contained in a robust ABS/Polycarbonate injection moulded case
which accommodates all the high voltage, power and control components in the base
section and the measurement and display electronics in the lid section. The lid section
features a large LCD for the display of measurements and OVERFLOW and FUSE OK
LED indicators. The OVERFLOW indicator will illuminate when any reading
exceeds 1999 on the LCD display. A sturdy zip pouch located at the rear of the instru-
ment contains all the necessary test leads and the mains supply connector. Access is
also available to additional test sockets for 4 wire Earth Bond tests and remote
Insulation Resistance measurements. The base control panel of the instrument features
a rotary switch for test selection and a push button test switch with associated LED
indicators.
A number of safety features are included in the instrument design and these include;
1) Fuse protection.
2) Thermal trip on electronic components to prevent failure due to over heating of unit.
3) Fail-safe crowbar system to prevent internal test relays from being continuously
powered in the remote possibility of failure of the control electronics.
The use of the PAC1500Xi is straight forward and involves connecting the checker to a
mains supply which powers the electronic circuitry. Plug the appliance under test into
the instrument socket outlet on the top plate and connect the test leads appropriate to
the insulation class of the appliance.
APPLICATIONS
The PAC1500Xi is designed to check the electrical safety of portable appliances and its
use allows for appliances of Class 1 and Class 2 to be checked.
As a guide BS and IEC standards define these two categories of insulation as follows;
Class 1 Appliances which have a functional insulation throughout and have
exposed conductive (typically metal) parts connected to earth. These
are often described as earthed appliances.
Class 2 Appliances which have both functional and additional insulation and
where any metal parts cannot become ‘Live’ under fault conditions.
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