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COMPEX > UNIT 11: Inspection > Flashcards

UNIT 11: Inspection Flashcards

1
Q

1.
A visual inspection is defined as an inspection which?

Is carried out prior to equipment being brought into service

Is carried out on some of the equipment

Identifies defects apparent to the eye without using tools or ladders

Includes those aspects covered by a close inspection and which also
identifies those defects only identifiable by opening the enclosure

A

Identifies defects apparent to the eye without using tools or ladders

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2
Q

2.
The maximum interval between the periodic inspections of movable electrical equipment (portable and transportable equipment) is?

6 months

1 year

2 years

3-years

A

Close inspection at least every 12-months.

Should be visually checked by the user before each use, to check for obvious damage.

Enclosures which are frequently opened shall be given a detailed inspection at least every 6-months.

The basis for changing the inspection period shall be documented

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3
Q

3.
A close inspection of an IS installation would reveal that?

Electrical connections are tight

Cable screens are earthed as per documentation

The installation is clearly labelled

There are no unauthorised modifications.

A

The installation is clearly labelled

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4
Q

4.
Fault-finding or testing in an hazardous area is permitted when?

A gas-free certificate has been obtained

The equipment is flameproof Ex d

When the area of work has a gas monitor

The equipment is pressurised Ex p

A

A gas-free certificate has been obtained

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5
Q

5.
A flameproof cable gland will be dismantled during which one of the following grades of inspection?

Detailed

Close

Periodic

Visual

A

Detailed

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6
Q

6.
Before opening electrical equipment in an hazardous area installation supplied
from a remote switch room, which one of the following is the minimum isolation requirement?

Open and disconnect the phase and neutral conductors in a double pole isolator, close and lock in the off position

Remove line conductor fuse, close and lock fuse box

Switch off the relevant contactor

Lock an on-load double pole (phase and neutral) isolator in the off position.

A

Lock an on-load double pole (phase and neutral) isolator in the off position.

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7
Q

7.
The type of inspection required on the equipment in an installation when handed over from the installer is?

Sample

Initial

Detailed

Visual

A

Initial

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8
Q

8.
Which of the following statements represents a detailed inspection on flameproof equipment?

Enclosed break and hermetically sealed devices are intact

Internal battery satisfies installation requirements

Cable screens are earthed

Apparatus circuit identification is correct.

A

Apparatus circuit identification is correct

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9
Q

9.
Which one of the following is necessary to carry out a close inspection?

Continuity / insulation resistance tester

Tools

A circuit diagram

Isolation of the equipment.

A

Tools

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10
Q

10.
Which one of the following is an accepted grade of inspection?

Frequent;

Periodic;

Sample;

Visual

A

Visual

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11
Q

11.
Where a hazardous area has not been declared gas-free, live working (under PTW) may be authorised ?

The work is on an IS circuit;

The work to be done is inside an EEx d enclosure;

Safety gloves are worn;

The equipment is supplied from a ‘separated extra low voltage’ (SEL V)
transformer

A

The work is on an IS circuit

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12
Q

12.
A close inspection is a grade of inspection which?

is carried out on part of the equipment in an installation;

without the use of tools and access equipment, those defects
apparent to the eye;

is carried out on a regular basis;

includes those aspects covered by a visual inspection and in addition,
identifies faults apparent only by the use of tools and access equipment.

A

includes those aspects covered by a visual inspection and in addition,
identifies faults apparent only by the use of tools and access equipment.

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13
Q

13.
The grade of inspection required prior to an installation being brought into service
is?

Detailed;

Close;

Visual;

Sample

A

Detailed

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14
Q

14.
Which one of the following represents a check carried out during a detailed inspection on Ex d, Ex e or Ex n equipment?

Motor speeds are correct;

The cooling fans of motors have sufficient clearance to enclosures and/or covers;

The power output of the motor is adequate for the application;

The power supply phase rotation is correct

A

The cooling fans of motors have sufficient clearance to enclosures and/or covers;

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15
Q

15.
Which one of the following is required when carrying out a close inspection of a pressurised Ex pz motor?

an insulation (IR) test of the stator windings

electrical protective devices are set correctly

ducts, pipes and enclosures are in good condition;

electrical protective devices operate within permitted limits

A

ducts, pipes and enclosures are in good condition

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16
Q

16.
Point-to-point inspections of intrinsically safe systems are required at

only the initial inspection;

each detailed inspection;

every periodic inspection;

each sample inspection

A

only the initial inspection

17
Q

17.
During an inspection of an Ex e enclosure which one of the following would be identified during a visual inspection?

Enclosure sealing gaskets are satisfactory;

Earth loop impedence is satisfactory;

There are no visible unauthorised modifications;

Lamp rating, type and position are correct.

A

There are no visible unauthorised modifications;

18
Q

18.
A detailed inspection only of Ex i equipment would involve which one of the following?

Installation is clearly labelled;

Equipment installed is that specified in the documentation;

Equipment is suitable for the EPL / Zone requirements of the area;

Cable screens are earthed according to the documentation.

A

Cable screens are earthed according to the documentation

19
Q

19.
Which one of the following would apply during a close inspection of Ex e or Ex n equipment?

Electrical installation is clean and dry;

Equipment circuit identification is available;

Lamp rating, type and position are correct:

Electrical connections are tight.

A

Equipment circuit identification is available;

20
Q

20.
The protection type that prevents entry of an external flammable gas or vapour is?

Exe;

Exp;

Ex ib:

Ex d.

A

Exp

21
Q

21.
A flammable gas or vapour can enter which one of the following without affecting
safety?

Ex p;

Ex d;

Ex m:

Ex o.

A

Ex d

22
Q

22.
The protection type providing the highest level of safety is which one of the following?

Exe;

Ex n;

Ex ib:

Ex ia.

A

Ex ia.

23
Q

What are the four types of inspection?

A

INITIAL
Inspection of all electrical equipment before it is brought into service. To check the selected type of protection and it’s installation are appropriate. Inspection to be detailed and results to be recorded.

PERIODIC
Periodic Inspections should be Close or Visual in nature.
Periodic inspections are those carried out on a routine basis and should be
Close and Visual in nature. The interval between periodic inspections shall not exceed 3-years without seeking expert advice. The basis for changing the inspection period shall be documented. Results should be recorded.

SAMPLE
Sample inspections should be Detailed, Close or Visual
Sample inspections are carried out on a defined subset or percentage of equipment installed, and should be used to monitor the effects of environment condition, vibrations, weakness, etc. as opposed to being used to reveal random faults like loose connections. Sample inspections may be Visual, Close or Detailed.
Results should be recorded.

CONTINUOUS SUPERVISION
Utilising visual or close inspections, this inspection requires personnel who have experience in the specific installation and environment to frequently inspect, service, care for and maintain the electrical installation. The use of continuous inspection does not remove the requirement for initial and periodic inspections

24
Q

What are the three grades of Inspection?

A

VISUAL
An inspection that identifies faults which are apparent to the eye. No contact with hand or tools, but includes reference to area classification diagram

CLOSE
An inspection that encompasses the aspects of a visual inspection, and in addition identifies defects. With contact by hand and tools and the use of access equipment such as ladders. Reference to documents to check specifications.

Close inspections do not normally require the enclosure to be opened, or de-energised, but may include opening of barrier boxes in non-hazardous areas.

DETAILED
An inspection that encompasses the aspects of a close inspection.

Opening of enclosures for internal inspection, to identify defects, like loose termination, and carrying out checks and testing, using tools and test equipment.

25
Q

For Periodic inspections, what grade of inspection is required.

Detailed

Close

Visual

Detailed or Close

Close or Visual

A

Periodic Inspections should be Close or Visual in nature.

Periodic inspections are those carried out on a routine basis and should be
Close and Visual in nature. The interval between periodic inspections shall not exceed 3-years without seeking expert advice. The basis for changing the inspection period shall be documented.

26
Q

For Sample inspections, what grade of inspection is required.

Detailed

Close

Visual

Detailed or Close

Close or Visual

Detailed, Close or Visual

A

Detailed, Close or Visual

Sample inspections are carried out on a defined subset of equipment and should be used to monitor the effects of environment condition, vibrations, weakness, etc. as opposed to being used to reveal random faults like loose connections. Sample inspections may be Visual, Close or Detailed.

27
Q

TABLE 1: INSPECTIONS

Ex d Ex e Ex n
COMMON INSPECTION FAULTS

VISUAL FAULTS
A.1   Equipment In wrong zone
A.7   Missing Cable ID
A.8   Enclosure Damaged
A.11  
Missing or Incorrect Cover Bolts
Missing or Incorrect Blanking Elements
Incorrect or Uncertified Glands

B.2 Damaged Cable Sheath
B.12 Flame-path Obstruction (flanged joints only)

CLOSE FAULTS
A.1 Equipment in wrong zone that requires access to equipment to read the Certification Plate.

A.2 Incorrect Gas Group
A.3 Incorrect Temperature Class
A.11
Missing Restricted Breathing two-part washer.
No Barrier gland fitted to Exd Equipment with an Internal Ignition Source (eg Ex d Switch in IIC Gas
Loose Cover Bolts
Loose Cable Glands

A 
Ex d DETAILED FAULTS
A.9 Damaged Flame Path 
       There is no Damage 
A.13 Damaged Flame Path
  Joint faces are clean and Undamaged

A.9 Gasket Fitted in the Flame path damaged or Incorrect part.

A.13 Gasket Fitted in the Flame path damaged or Incorrect part.

Ex e Ex N DETAILED FAULTS
A.9 Missing Terminal Partition
No damage or unauthorised modifications

A.9 Uncertified terminals fitted to a certified enclosure.
There are no unauthorised modifications

A.9 Damaged terminals in a certified enclosure. There are no damages or unauthorised modifications

B.10 Missing Terminal Partition
Specific conditions of use are complied with

A.17 Loose Connections
Electrical connections are tight

B.10 more than 1mm of exposed conductor. Specific conditions of use are complied with.

B.10 Cores of Different cables loomed together. Specific conditions of use complied with.

A.28 Incorrect Lamp size. Lamp type Correct.

28
Q

TABLE 2: INSPECTIONS

Ex I
COMMON INSPECTION FAULTS

VISUAL FAULTS
A.1   Equipment In wrong zone
A.8  Missing Blue IS circuit label
A.8  Missing Cable ID
A.9 Damaged Equipment.
C.1 Damaged Equipment 
A.10 Missing IP Stoppers

B.3 Damaged Cable Sheath
B.3 Exposed Cable armour at gland.

C.1 IP washer on incorrect side of earth

CLOSE FAULTS
A.2 Incorrect Gas Group
A.2 Additional Equipment (Not on Floor plan)
A.2 Incorrect Gas Group
A.2 Incorrect Type or Model
A.2 Incorrect Equipment for example
Documentation states certified equipment. However Uncertified equipment / Simple Apparatus has been installed in its Place

A.10 Loose Gland
A.10 Loose or missing blanking element

A

Ex i DETAILED FAULTS
A.2 incorrect type of zener
A.2 Incorrect manufacturer.
A.2 Incorrect type of Galvanic Isolator

A.11 Incorrect terminals Fitted. example Non-IS terminal fitted
With IS Terminals.

A.13 Reversed Zener Barrier or Galvanic Isolator

A.15 loose connections
A.15 Damaged terminals in a Certified Enclosure.

B.1 Badly Terminated or
Exposed Conductor

B.2 Cable Screen not in accordance with Documentation

B.6 IS Earth Cables loose or CSA of IS Earth Cables Incorrect, (not matching documentation)

B.7 IS Earth connection to plant or Enclosure Earth

B.8 IS Earth connection to plant or Enclosure Earth

B.10 IS and Power Cables Tied or Loomed together.

B10. No 50mm separation between IS and Non-IS Terminals

COMPEX (14 decks)

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