CHAPTER 55 - OTHER EQUIPTMENT

Question 1

rotating machines - machines that spin

Answer 1

every electric motor exceeding 0.37kw must be supplied with a means of protection of overload.
a motor should have a means of ensuring iy foist restart after a brief interruption of the supply, unless this wld cause more danger

Question 2

accessories - plugs and socket outlets

socket outlets should be arranged so that pins can’t contact live parts whilst other pins are exposed.

pg 211 table 55.1 for accepted plugs and socket outlets low voltage installations.

Answer 2

socket outlets should be fitted so that the flex if the plug is not subjected to forces which may damage or affect the integrity of the connections of the plugs and socket ( e.g mounted at a reasonable height above work surfaces). 533.1.6 -

Question 3

joining cables together

Answer 3

we use cable couplers

Question 4

we connect current connecting equipment directly to the installation.

section 554

Answer 4

any questions about transformers

section 554

Question 5

section 557 covers both AC & DC auxiliary circuits. a auxiliary circuit is a circuit within a circuit.

symbols used in luminaries - pg 222

Answer 5

section 559 - luminares and lighting installations.

a ballast is found inside a luminare. the stroboscopic effect can give misleading impressions of moving parts being stationary, can avoid these effects by selecting luminaries with suitable lamp control gear.