Special Installations - Potentially Explosive Atmospheres, codes of practice, equipment, practices, safety, codes - 8 questions from a bank of questions
Which ONE of the following statements is true of PETROLEUM VAPOUR ?
It is heavier than air
It is lighter than air
It does not mix with air
It is non-combustible
What is missing from the 'FIRE TRIANGLE' diagram shown here ?
paper
fuel
petrol
oil
SWA and MIMS cable systems can be used in Potentially explosive atmospheres. What is required of the cable glands for these systems?
They are longer than standard
They are standard
They must be made of pvc
They MUST be sealed with special cement
What GROUP of INDUSTRY is a MINE Installation?
Group A
Group B
Group II
Group I
What GROUP of INDUSTRY is a Petroleum / Chemical Installation?
Group A
Group B
Group I
Group II
What is the European Mark (symbol) for Flame Proof Equipment ?
Ex
EEx
XX
EUREX
What is the symbol shown here?
European standard symbol for flameproof equipment
BS symbol for flameproof equipment
International symbol for flameproof equipment
None of the above
Shown here is the CENELEC/IEC Mark. What is signified by the missing description (?).
Location
Gas
material
Weight
What is the definition of a ZONE 2?
an area where an explosive gas/air mix is unlikely to occur during normal operation (<10 hrs/year)
an area where an explosive gas/air mix is likely to occur during normal operation (up to 1000 hrs/year)
an area where an explosive gas/air mix is likely to occur during normal operation (> 1000 hrs/year)
an area where an explosive gas/air mix never occurs
What is the definition of a ZONE 0?
an area where an explosive gas/air mix is unlikely to occur during normal operation (<10 hrs/year)
an area where an explosive gas/air mix is likely to occur during normal operation (up to 1000 hrs/year)
an area where an explosive gas/air mix is continuously present or present for long periods of time (> 1000 hrs/year)
an area where an explosive gas/air mix never occurs
What is the definition of a ZONE 1?
an area where an explosive gas/air mix is unlikely to occur during normal operation (<10 hrs/year)
an area where an explosive gas/air mix is likely to occur during normal operation (up to 1000 hrs/year)
an area where an explosive gas/air mix is continuously present or present for long periods of time (> 1000 hrs/year)
an area where an explosive gas/air mix never occurs
What is meant by EX'o' equipment?
Oil-filled electrical equipment
Powder-filled electrical equipment
Flameproof electrical equipment
Intrinsically safe electrical equipment
What is meant by EX'p' equipment?
Oil-filled electrical equipment
Powder-filled electrical equipment
Flameproof electrical equipment
Intrinsically safe electrical equipment
What is meant by EX'd' equipment?
Oil-filled electrical equipment
Powder-filled electrical equipment
Flameproof electrical equipment
Intrinsically safe electrical equipment
What is meant by EX'ia' equipment?
Oil-filled electrical equipment
Powder-filled electrical equipment
Flameproof electrical equipment
Intrinsically safe electrical equipment
Intrinsically Safe electrical equipment is designed to be installed in?
Zone 0
Zone 1
Zone 2
All Zones
Shown here is a flameproof electrical junction box. Why does it have 'wide machined flanges with many small grooves across the mating faces and many securing bolts OR helical screw lids'?
To make it look acceptable
To allow the arc/flame to 'cool' before reaching the atmosphere whilst maintaining the integrity of the enclosure
To make it difficult for unauthorised persons to tamper with it
To keep the enclosure 'air-tight'
Shown here is an INTRINSIC SAFETY BARRIER. What are the components indicated by the arrows?
Diodes
Zener Diodes
Transistors
Thyristors
What is the minimum classification for types of equipment can be installed in ZONE 1?
EX'd'
any equipment
only ELV (Extra Low Voltage) equipment
EX'ia'
Why are TWO diodes installed in an 'INTRINSIC SAFETY BARRIER' ?