ISOLATION, SWITCHING, CIRCUIT PROTECTION, WIRING and ENCLOSURES (use BS7671:2018)
Regulations on Isolation, switching and protection - use BS7671:2018 - 8 questions from a bank of questions
Answer ALL questions. Look for any feedback given if you get an answer incorrect. Keep choosing an answer until you get it correct. CORRECT or INCORRECT answers are indicated at the TOP of the page. A score is given at the TOP of the page when the exercise has been completed. © K.Brown 2018
Which regulation specifies that 'a means of isolation shall be provided so that voltage may be cut off, as necessary, to prevent danger'?
- 132.15.201
- 341.1
- 411.3.3
- 537.5.1.1
What is the definition of a device designed to 'make and break contact against the flow of current i.e. on load'?
- an isolator
- a switch
- a circuit breaker
- an RCD
What is the definition of a device designed to 'make and break contact off load'?
- an isolator
- a switch
- a circuit breaker
- an RCD
What is confirmed by regulation 537.2.5?
- switches are of the correct design
- provision shall be made for securing isolators against unintentional opening
- switches display ON and OFF clearly
- switching signs are clearly displayed
What is shown here?

- an isolator
- a firemans switch
- a switch fuse
- a fused switch
What type of switching configuration is shown in the diagram here?

- spst
- dpdt
- dpst
- spdt
What protective device provides the function of an residual current device with a circuit breaker, in the same enclosure?
- MCB
- RCD
- RCBO
- MCCB
What protective device provides the function of a miniature circuit breaker usually fitted to protect supply cables?
- MCB
- RCD
- RCBO
- MCCB
Which one of the following devices is not designed to protect against overload currents?
- RCD
- Fuse
- Circuit Breaker
- MCCB
What type of protective device is designed to withstand high circuit current interruptions during high fault current flow?
- semi-enclosed fuse
- BS1362
- BS88
- BS3036
What protective device is best suited to protecting against earth leakage currents, overload currents and short-circuit currents?
- RCD
- MCB
- RCBO
- Cartridge fuse
Which one of the following term describes 'Basic Protection' ?
- protection against receiving a shock by touching live parts in an otherwise fault-free circuit
- protection against touching a metal trunking that has become live
- protection against touching two different metal parts simultaneously, one of which is live
- protection against receiving a shock from the metal body of a motor (for example)
Which one of the following best describes the term 'Fault Protection' ?
- protection against removing a cover from a piece of electrical plant and receiving an electric shock
- protection against being able to stick your finger into an electrical enclosure and receiving and electric shock
- protection against receiving an electric shock from a faulty water pump housing
- protection against accidentally touching an overhead line whilst working from a ladder
What properties should all electrical connections have?
- mechanical strength
- electrical strength
- mechanical and electrical strength
- none of the answers shown here
What type of cable enclosure system should not be used in areas with regular changes in ambient temperature ?
- steel conduit
- Steel trunking
- MIMS
- High impact PVC conduit
What type of cable support system is shown here ?

- Cable tray system
- Cable basket system
- Ladder system
- Cable ducting
What is the minimum percentage of space, allocated for 'cooling ' in this trunking ?

- 35%
- 45%
- 55%
- 75%
What is the maximum percentage of space, allocated for 'cables ' in this trunking ?

- 35%
- 45%
- 55%
- 75%
What is the minimum space allocated for cooling inside a 'ducting' ?
- 35%
- 45%
- 55%
- 75%