How do I test my extension lead for the Earth, Insulation and Load tests?
Earth tests and Insulation tests on extension leads can easily be undertaken using a special ROBIN
Extension lead test adaptor (catalogue code EL 100). A load test is not applicable to an extension lead
and is therefore not required.
What tests should I do?
For a comprehensive overview of portable appliance testing and specific tests that should be performed, it
is suggested that reference is made to the Code of Practice for In-Service Inspection and Testing of
Electrical Equipment. This document has been prepared by the Institution of Electrical Engineers and is
available direct from them. The IEE can be contacted on 01438 313311.
What is meant by class I, II and III?
There are a number of basic equipment constructions that are referred to in all standards for electrical
equipment. They are important because they determine how the user is protected against electric shock
and what tests are appropriate when assessing safety.
Class I equipment is where protection against electric shock is achieved by using basic insulation and
providing a means of connecting to the protective earthing conductor in the fixed installation wiring any
conductive parts (eg. metal) that could otherwise assume hazardous voltages if the basic insulation failed.
Consequently Class I equipment relies for its safety upon a satisfactory earth in the fixed wiring installation
and an adequate connection usually via a flexible cable to it.
Class II equipment is where the protection against electric shock is provided by a basic insulation and a
secondary level of insulation, such as a double insulation or reinforced insulation. There is no provision
for protective earthing or reliance upon installation earthing. Class II equipment should be identified with
the Class II construction mark, which is essentially a square within a square.
Class III equipment relies for protection against electric shock from an SELV source (separated extra low
voltage). The Class III construction mark should be found on such appliances and is Roman numeral III
inside a rhombus. SELV voltages will not exceed 50V. Class III equipment must be supplied from a safety
isolating transformer to BS3535.
How do I find the class of an appliance?
It is sometimes difficult to actually define the class of a piece of equipment. It is suggested that reference
be made to the appliance rating plate or look for specific construction marks for Class II and Class III
appliance which may be found adjacent to the manufacturers details on the appliance.
How do I change the pass/fail threshold?
The pass/fail threshold of any particular test should only be adjusted by persons competent in performing
the various tests with full understanding of the interpretation of the test thresholds. If you wish to
change the pass/fail threshold, refer to the Programming mode section of this manual and follow the
instructions detailed.
What are the pre-programmed pass/fail threshold?
Pre-programmed pass/fail thresholds are listed in the manual where applicable. A list of all thresholds can
be obtained from the ROBIN sales office.
Can the SmartPAT download to other software packages?
Yes, the SmartPat can download to other packages. It can download to any derivative software produced
by Shire Safety Systems. It is also compatible with the Metrotest Downloader 4 Plus System. For further
information on compatibility with other manufactures software, please contact ROBIN Electronics.
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