T
ta-electrical
Hi, a few exam questions needing answers. Any help would be very appretiated.
11) A circuit which includes surge protection devices is to be tested to determine insulation resistance. State,
a) two methods recognised in BS7671 for safety testing this circuit.
b) the minimum test voltage which can be applied.
16)
a) State the test instrument used to measure the earth electrode resistance for...
(i) a generator.
(ii) an instrument protected by an RCD and forming part of a IT system.
b) State the number of readings to be taken for the test in a(i) above.
22) One part of the building has an area where chemical etching and washiing down takes place
(a) (i) List three factors which must be considered when inspecting the containment system in this particular area.
(a) (ii) Identify, for each of the factors given in a(i) above, the human senses that would best determine compliance.
(b) The owner has agreed that the whole installation may be isolated in order for testing to be carried out. There has been a period of one hour allocated for this work. List the tests that must be carried out during this period (individual circuits may be isolated after this period).
26) During the course of the inspection one of the single phase radial circuits supplying an item of fixed equipment is to be checked for voltage drop compliance. The cicuit has the following charactistics;
(b) (i) State a suitable observation to be recorded on this oeriodic report if the voltage drops fails to comply.
(ii) State one action which could be taken to rectify the situation in (b)(i) above.
Thanks in advance.
11) A circuit which includes surge protection devices is to be tested to determine insulation resistance. State,
a) two methods recognised in BS7671 for safety testing this circuit.
b) the minimum test voltage which can be applied.
16)
a) State the test instrument used to measure the earth electrode resistance for...
(i) a generator.
(ii) an instrument protected by an RCD and forming part of a IT system.
b) State the number of readings to be taken for the test in a(i) above.
22) One part of the building has an area where chemical etching and washiing down takes place
(a) (i) List three factors which must be considered when inspecting the containment system in this particular area.
(a) (ii) Identify, for each of the factors given in a(i) above, the human senses that would best determine compliance.
(b) The owner has agreed that the whole installation may be isolated in order for testing to be carried out. There has been a period of one hour allocated for this work. List the tests that must be carried out during this period (individual circuits may be isolated after this period).
26) During the course of the inspection one of the single phase radial circuits supplying an item of fixed equipment is to be checked for voltage drop compliance. The cicuit has the following charactistics;
- Load current = 45 A
- Circuit length = 80 m
- Live conductors = 10 mm2
(b) (i) State a suitable observation to be recorded on this oeriodic report if the voltage drops fails to comply.
(ii) State one action which could be taken to rectify the situation in (b)(i) above.
Thanks in advance.