/
Electrical Safety Terms
Save to my account
Sign up
Electrical Safety Terms
Electrical Safety Terms
Study
1
Question
What is a current impulse 8/20 as defined in the regulations?
Page 1
Answer
A current impulse with a virtual front time of 8 μs and a time to half-value of 20 μs.
2
Question
How is the front time defined for a current impulse?
Page 1
Answer
1.25(t90 - t10), where t90 and t10 are the 90% and 10% points on the leading edge of the waveform.
3
Question
What is an accessory in electrical installations?
Page 1
Answer
A device, other than current-using equipment, associated with such equipment or with the wiring of an installation.
4
Question
Define agricultural and horticultural premises according to BS 7671.
Page 1
Answer
Rooms, locations or areas where livestock are kept, or feed, fertilizers, vegetable and animal products are produced, stored, prepared or processed, or plants are grown, such as greenhouses.
5
Question
What does ambient temperature refer to in equipment use?
Page 1
Answer
The temperature of the air or other medium where the equipment is to be used.
6
Question
What is classified as an amusement device?
Page 1
Answer
Ride, stand, textile or membrane building, side stall, side show, tent, booth or grandstand intended for the entertainment of the public.
7
Question
Distinguish an appliance from other current-using equipment.
Page 1
Answer
An item of current-using equipment other than a luminaire or an independent motor.
8
Question
What defines arm's reach in electrical safety?
Page 1
Answer
A zone of accessibility to touch, extending from any point on a surface where persons usually stand or move about to the limits which a person can reach with a hand in any direction without assistance.
9
Question
What are arrangements for livestock keeping?
Page 1
Answer
Buildings and rooms (housing for animals), cages, runs or other containers used for continuous accommodation of livestock.
10
Question
Define an auxiliary circuit.
Page 1
Answer
Circuit for transmission of signals intended for control, detection, supervision or measurement of the functional status of a main circuit.
11
Question
What is back-up protection?
Page 1
Answer
Protection of a device by overcurrent co-ordination between that device and an overcurrent protective device (OCPD) in series with it, generally but not necessarily on the supply side.
12
Question
How does a barrier provide protection?
Page 1
Answer
A part providing a defined degree of protection against contact with live parts from any usual direction of access.
13
Question
What is basic insulation?
Page 1
Answer
Insulation applied to live parts to provide basic protection and which does not necessarily include insulation used exclusively for functional purposes.
14
Question
Define basic protection.
Page 1
Answer
Protection against electric shock under fault-free conditions. For low voltage, it corresponds to protection against direct contact.
15
Question
What is a basin of a fountain?
Page 1
Answer
A basin not intended to be occupied by persons and which cannot be accessed without ladders or similar means. Swimming pool requirements apply if occupiable.
16
Question
What is a bonding conductor?
Page 1
Answer
A protective conductor providing equipotential bonding.
17
Question
Define bonding network (BN) {444}.
Page 1
Answer
A set of interconnected conductive parts that provide a path for currents from DC to RF intended to divert, block or impede electromagnetic energy.
18
Question
What is a bonding ring conductor (BRC) {444}?
Page 2
Answer
A bus earthing conductor in the form of a closed ring, normally with multiple connections to the common bonding network (CBN).
19
Question
Define a booth.
Page 2
Answer
Non-stationary unit intended to accommodate equipment generally for pleasure or demonstration purposes.
20
Question
What is an accessible building void?
Page 2
Answer
A space within the structure or components of a building accessible only at certain points, such as within partitions or suspended floors.
21
Question
Define bunched cables.
Page 2
Answer
Cables contained within a single conduit, duct, ducting, or trunking, or if not enclosed, not separated by a specified distance.
22
Question
What is a busbar trunking system?
Page 2
Answer
A type-tested assembly of enclosed solid conductors separated by insulating material, including units like busbar trunking, tap-off units, etc.
23
Question
Define bypass bonding conductor {444}.
Page 2
Answer
Bonding conductor connected in parallel with the screens of cables.
24
Question
What is a cable channel?
Page 2
Answer
An enclosure above or in ground, ventilated or closed, allowing access to cables but not persons.
25
Question
Define cable cleat.
Page 2
Answer
Component of support system that mechanically retains cable or conduit at intervals.
26
Question
What is a cable coupler?
Page 2
Answer
Means of enabling connection or disconnection at will of two flexible cables, consisting of connector and plug.
27
Question
Distinguish cable ducting from conduit.
Page 2
Answer
Enclosure of metal or insulating material for cable protection where cables are drawn in after erection.
28
Question
What is a cable ladder?
Page 2
Answer
Cable support with transverse elements fixed to longitudinal members.
29
Question
Define cable tray.
Page 2
Answer
Cable support with continuous base, raised edges, and no covering; may be perforated.
30
Question
What is cable trunking?
Page 2
Answer
Closed enclosure of rectangular cross-section with one removable or hinged side for cable protection and equipment.