AQA GCSE COMBINED SCIENCE TRILOGY
HIGHER TIER PHYSICS PAPER 1H
EXAMINATION 2
⩥ What does NPFLA stand for? Answer: Non-Power Limited Fire
Alarm.
⩥ What material must NPFLA circuit conductors be made from?
Answer: Only solid or stranded copper is permitted.
⩥ What is a single station detector? Answer: Battery powered smoke
detectors that do not communicate off premises.
⩥ What is a multiple station detector? Answer: Mains powered smoke
detectors with battery backup that are linked together, so that if one unit
initiates, alarms in all detectors will sound. They do not communicate
off premises.
⩥ How frequently must household single and multiple station detectors
be inspected and tested? Answer: In accordance with the manufacturers
recommendations, at least monthly.
,⩥ How frequently must household fire alarm systems be inspected and
tested? Answer: At least every 3 years, by a qualified service technician.
⩥ How frequently must heat detectors be tested? Answer: Two or more
annually different detectors must be tested each year though and within
5 years all detectors must have been tested.
⩥ What does "restorable" mean? Answer: The detector can be "restored"
or "reused" after it has initiated an alarm.
⩥ What does "non-restorable" mean? Answer: The detector cannot be
"reused" after it has initiated an alarm. (Think of a heat detector, which
self-destructs upon initiating.)
⩥ What size conductors are permitted? Answer: Size 18 A.W.G and 16
A.W.G are permitted, provided they do not exceed certain rated
ampacities.
⩥ What is used to protect transformers or other devices supplied from
power-supply conductors? Answer: An over-current device not rated
over 20 Amperes.
⩥ When located within 7 feet of the floor, how shall cables be fastened?
Answer: Cables shall be fastened in an approved manner at intervals of
not more than 18 inches.
, ⩥ Single conductors shall not be smaller than ___ A.W.G? Answer: 18.
⩥ Conductors of 26 A.W.G shall only be permitted in which
circumstances? Answer: Where spliced with a connector listed as
suitable for 26 to 24 A.W.G.
⩥ How should PFLA conductors NOT be installed? Answer: PFLA
conductors shall not be strapped, taped or attached to the exterior of any
conduit or raceway.
⩥ What is a Plenum cable? What are its characteristics? Answer: Cable
that can be installed in ducts, plenums or other spaces used for
environmental air.
It has adequate fire resistance and low smoke producing characteristics.
⩥ What is Riser cable? What are its characteristics? Answer: Cable to be
used in vertical wire runs in shafts or between floors. Not to be used
where Plenum cable is required.
It is capable of preventing fire from rising floor-to-floor.
HIGHER TIER PHYSICS PAPER 1H
EXAMINATION 2
⩥ What does NPFLA stand for? Answer: Non-Power Limited Fire
Alarm.
⩥ What material must NPFLA circuit conductors be made from?
Answer: Only solid or stranded copper is permitted.
⩥ What is a single station detector? Answer: Battery powered smoke
detectors that do not communicate off premises.
⩥ What is a multiple station detector? Answer: Mains powered smoke
detectors with battery backup that are linked together, so that if one unit
initiates, alarms in all detectors will sound. They do not communicate
off premises.
⩥ How frequently must household single and multiple station detectors
be inspected and tested? Answer: In accordance with the manufacturers
recommendations, at least monthly.
,⩥ How frequently must household fire alarm systems be inspected and
tested? Answer: At least every 3 years, by a qualified service technician.
⩥ How frequently must heat detectors be tested? Answer: Two or more
annually different detectors must be tested each year though and within
5 years all detectors must have been tested.
⩥ What does "restorable" mean? Answer: The detector can be "restored"
or "reused" after it has initiated an alarm.
⩥ What does "non-restorable" mean? Answer: The detector cannot be
"reused" after it has initiated an alarm. (Think of a heat detector, which
self-destructs upon initiating.)
⩥ What size conductors are permitted? Answer: Size 18 A.W.G and 16
A.W.G are permitted, provided they do not exceed certain rated
ampacities.
⩥ What is used to protect transformers or other devices supplied from
power-supply conductors? Answer: An over-current device not rated
over 20 Amperes.
⩥ When located within 7 feet of the floor, how shall cables be fastened?
Answer: Cables shall be fastened in an approved manner at intervals of
not more than 18 inches.
, ⩥ Single conductors shall not be smaller than ___ A.W.G? Answer: 18.
⩥ Conductors of 26 A.W.G shall only be permitted in which
circumstances? Answer: Where spliced with a connector listed as
suitable for 26 to 24 A.W.G.
⩥ How should PFLA conductors NOT be installed? Answer: PFLA
conductors shall not be strapped, taped or attached to the exterior of any
conduit or raceway.
⩥ What is a Plenum cable? What are its characteristics? Answer: Cable
that can be installed in ducts, plenums or other spaces used for
environmental air.
It has adequate fire resistance and low smoke producing characteristics.
⩥ What is Riser cable? What are its characteristics? Answer: Cable to be
used in vertical wire runs in shafts or between floors. Not to be used
where Plenum cable is required.
It is capable of preventing fire from rising floor-to-floor.
