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ECOP > ECOP > Flashcards

ECOP Flashcards

1
Q

The Electricity at work regulations requires that all work done on any electrical plant shall be carried out DEAD unless …

A

unreasonable in all circumstances to work dead
reasonable to work live
suitable precautions are taken to prevent injury

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2
Q

Define Electrical equipment

A 
any item intended to be used or installed for use to
generate
rectify
use
measure
provide
store
distribute
control
convert
conduct
transmit
transform
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3
Q

Define System

A

an electrical system in which all electrical equipment is electrically connected to a common source of electrical energy

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4
Q

Define Low Voltage

A

a voltage not exceeding 1000VAC or 1500VDC

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5
Q

Define Dead

A

at or about zero potential and disconnected from any live system

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6
Q

Define Live

A

Electrically charged

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7
Q

Define Earth

A

The conductive mass of the earth who’s potential at any point is assumed zero

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8
Q

Define Earthed

A

Connected to earth through switch-gear or conductors having an adequately rated earthing capacity

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9
Q

Define Isolated

A

Disconnection and separation of the electrical equipment from every source of electrical energy in such a way that the disconnection and separation is secure

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10
Q

Define Isolator

A

A pad-lockable device for rending electrical electrical equipment isolated in a secure and effective manner

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11
Q

Name some codes and standards

A 
Health & Safety at Work Act (HASAW)
Electricity at Work Regs (EAWR 1989)
Wiring Regs (BS7671)
Test Leads (GS38)
Explosive Atmospheres (ATEX) & (BS EN 60079)
Safety of Machinery (BS EN 60204)
Code of Practice for Earthing (BS 7430)
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12
Q

What needs done to work on DEAD Electrical Plant & Equipment

A
  • Obtain electrical circuit drawings
  • Confirm details of the relevant circuits need to be isolated
  • Confirm details of any safety procedures or requirements that may apply
  • Investigate whether any hazardous substances, processes or other special conditions will be present
  • A Method Statement may be required
  • Identify the plant or equipment and isolate
  • Lock off or secure all sources
  • Affix approved warning notices to all points of isolation.
  • Prove that the plant or equipment is dead by the approved methods of test.
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13
Q

When testing LIVE what should the test probe and leads have

A

Test probes and leads used with a voltage indicator or voltmeter should have:-

  • finger barriers or be shaped so as to guard against inadvertent hand contact with the live conductors under test.
  • The leads to be adequately insulated - normally double insulation.
  • Test instruments should be clearly marked with the maximum voltage which may be tested and any short time rating for the device.
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14
Q

How do you use a Voltage detector

A

They must be proved before and after use (for each activity) on a known source of similar voltage to the circuit under test or alternatively on a portable test source.

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15
Q

What is a Green Panel

A

All components within the panel are to IP2X standard

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16
Q

What is a Yellow Panel

A

Generally to IP2X standards – clear plastic covers fitted over non-IP2X components

17
Q

What is a Red Panel

A

Contains exposed low voltage terminals identified after assessment of panels

18
Q

What are approved tasks in a Green Panel

A
  • Live testing
  • Visual inspection
  • Re-setting of circuit breakers and overloads
  • Replacement of control circuit fuses
  • Isolation of the equipment
  • Minor Tasks deemed safe to be carried out after consultation with authorized person.
19
Q

If you removed any barriers or protective elements in a green panel what would this mean

A

the panel would be downgraded to a red panel

20
Q

How do you diagnose a circuit in a Yellow Panel

A

Clear plastic covers fitted, suitably drilled for diagnosis. All plastic covers to be replaced and made secure on completion

21
Q

If you removed any plastic covers in a yellow panel what would this mean

A

the panel would be downgraded to a red panel

22
Q

What are approved tasks in a Red Panel

A

Visual inspection

23
Q

What are approved tasks in a Red Panel after you’ve had assessment of requirement for appropriate PPE

A

Isolation of equipment
Resetting of circuit breakers and overloads
Live testing

24
Q

Describe IP2x

A

This rating indicates that any hazardous parts cannot be accessed by a finger or solid objects greater than 12.5 mm

25
Q

What is a MCB?

A

MCB stands for Miniature Circuit Breaker. It automatically switches OFF electrical circuit during any abnormal condition in the electrical network such as overload & short circuit conditions.

26
Q

What is a MCCB?

A

MCCB stands for Molded Case Circuit Breaker. Used when load current exceeds the limit of a miniature circuit breaker. Provides protection against overload, short circuit faults and is also used for switching the circuits.

27
Q

What is an RCD?

A

An RCD, or residual current device, is a life-saving device which is designed to prevent you from getting a fatal electric shock if you touch something live, such as a bare wire.

28
Q

What does an RCD do?

A

An RCD is a sensitive safety device that switches off electricity automatically if there is a fault.

29
Q

What would you use a type B MCB for?

A

This is the most sensitive type of MCB, designed for domestic applications, and low voltage commercial settings where any current surges are likely to be small.

30
Q

What would you use a type C MCB for?

A

They are designed to trip at currents between five and ten times their rated load. Good examples include smaller electric motors and fluorescent lighting.

31
Q

What would you use a type D MCB for?

A

D-rated MCBs are designed to trip at currents between 10 and 20 times their rated load. They are built for heavy-duty commercial and industrial devices where very strong current surges occasionally occur. Examples include welding equipment, X-ray machines, large motors, and uninterruptible power supply units

ECOP (1 decks)

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