1. Safety
1.1 Safety Warnings
Safety warnings and precautions must be read and understood before the instrument is used. They must be observed
during use.
The circuit under test must be switched off, de-energised and isolated before test connections are made when
carrying out insulation and continuity tests.
Continuity of protective conductors and earthed equipotential bonding of new or modified installations must be
verified before carrying out an earth fault loop impedance test, RCD or earth testing
Do not touch circuit connections and exposed metalwork of an installation or equipment under test. Under fault
conditions the system earth could become hazardous live.
Do not touch the earth stakes, test leads and their terminations (including connections to the earthing system
under test) if an installation earth fault can arise, unless adequate precautions are taken.
The ‘live circuit warning’ and ‘automatic discharge’ functions are additional safety features and should not be
regarded as a substitute for normal safe working practices.
Do not move the rotary switch positions while a test is in progress.
Do not operate the instrument or connect it to any external system if it shows any visible signs of damage or if it
has been stored for prolonged periods in unfavourable conditions.
Do not operate the instrument or connect it to any external system if the battery compartment or casing is open
or any parts of the case (including keypad, selector switch, display window, etc.) are missing.
Always disconnect the instrument from all systems while batteries are being changed or the fuse replaced.
Do not replace rechargeable cells in the instrument with non-rechargeable “dry” cells and attempt to charge the
cells. This can cause explosion or fire.
Do not operate charging equipment supplied with the instrument in damp or wet environments or outdoors. All
test leads must be removed from the instrument while charging.
After insulation tests, capacitive circuits must be allowed to discharge before disconnecting test leads. Locking
the insulation test ON should only be used where there is no risk of a circuit holding a charge.
The instrument should not be used if any part of it is damaged.
Test leads, probes and crocodile clips must be in good order, clean and with no broken or cracked insulation.
All test leads supplied with the instrument form part of the measuring circuit of the instrument. They must not
be modified or changed in any way, or be used with any other electrical instrument or appliance.
A plug severed from the power cord MUST be destroyed, as a plug with bare conductors is hazardous in a live
socket outlet.
Ensure that hands remain behind guards of probes/clips when testing.
U.K. Safety Authorities recommend the use of fused test leads when measuring voltage on high energy systems.
Replacement fuses must be of the correct type and rating.
Failure to fit the correctly rated fuse will result in damage to the instrument in the event of an overload.
Special precautions are necessary when operating in situations where “live” earths may be encountered:
isolation switches and fuses (not supplied with this instrument) must be used.
Special precautions are necessary when working near high tension systems (MV and HV): rubber gloves and
shoes (not supplied with this instrument) should be worn.
Special precautions are necessary when working in wet conditions or in agricultural areas: observe the local
safety standards and take all necessary special precautions applicable to the particular location and do not touch
the test leads with bare hands.
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MFT1800 series
8
Safety
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