BATHROOM and SHOWER INSTALLATIONS (use BS7671:2018 Amendment 2:2022)
Special Installations: Bathrooms, zones, regulation requirements, circuits and protection - 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 2022
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What section of BS7671 is devoted to installations of this type?
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section 701
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section 753
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section 709
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section 711
What does BS7671:2018 specify about 13A socket-outlets in these locations?
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you can fit as many as you like
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prohibited within 2.5 metres horizontally from the boundary of zone 1
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maximum of 3
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only allowed if protected by an RCD
Shaver sockets to BSEN61558-2-5 are allowed in bathroom zone 2. What can you detail about the transformer design in these outlets?
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it is an isolating transformer
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it is an extra low voltage (ELV) transformer
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it provides an earth connection from the output to the mains supply, for safety
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they have a built-in RCD
What is the most hazardous zone in a bath / shower room?
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zone 0
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zone 1
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zone 2
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zone 3
What type of current using equipment can be fitted in ZONE 0 ?
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only SELV fixed equipment designed for that zone
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no electrical equipment
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only fixed equipment that can be accessed with a tool/key
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any electrical equipment
If a person is IN the bath / shower, what can you detail about any switches that could be reached from these areas?
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no switches should be reachable from these areas
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only pull-cord types to be within reach
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normal switches can be within reach
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only double-pole switches can be within reach
Which ZONE defines the area where people may be expected to 'stand or sit in water' ?
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zone 0
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zone 1
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zone 2
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un-zoned
Which ZONE can ventilation equipment and towel-rails be installed ?
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zone 0
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zone 2 ONLY
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zone 1 or 2
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outside zones ONLY
What is the dimension (metres) indicated by the arrows on this bathroom zone plan ?
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2.4m
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0.6m
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2.25m
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3.0m
Underfloor heating, if installed, MUST have which ONE of the following safety requirements?
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be at least 500mm below the floor
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be covered with a supplementary bonded, earthed metallic grid
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only buried in concrete
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protected by a 6A BSEN 60898 MCB
What ZONE is the pedestal sink in, shown in the picture here ?
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zone 0
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zone 1
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zone 2
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zone 3
What is the size of the exposed, unprotected, supplementary bonding conductor indicated by the blue arrow in the plan shown here ?
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1.5sq/mm
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2.5sq/mm
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4.0sq/mm
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6.0sq/mm
Additional protection by RCDs sets specific requirements for this type of location. Select the correct statement from the list below.
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RCD protection is only required for shaver points
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RCD protection is required only for circuits serving that location
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RCD protection is required for circuits passing through zones 1 and/or 2 to serve other locations
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RCD protection is required for circuits in that location or circuits passing through zones 1 and/or 2 that serve other locations
OK