general

Question 1

phase sequence

Answer 1

are L1 L2 AND L3. in the correct sequence

l1 comes first. l2 120 degrees out and l3 120 degrees out
if u get them the wrong way a 3 phase motor will run backwards so phase sequence needs to be maintained.
use an AVI

Question 2

purpose of initial verification.

Answer 2

to see if the the equipment selected and installed is in accordance with bs 7671 and is satisfactory to put into service. accompanied with electrical installation certificate and schedule of inspection and tests.

Question 3

10 steps for safe isolation on 3 phase

Answer 3

L1 - N L2-N L3- N
L1 - E. L2 -E L3-E
L1-L2 L2-L3 L1- L3
N-E

Question 4

safe isolation on a single phase.

Answer 4

L-N L-E N-E. each test giving 0 volts

Question 5

ip2x

Answer 5

prevention of a finger larger than 12.5mm

Question 6

ipxxb

Answer 6

up to 80 mm

Question 7

top horizontal surface is ip4x

Answer 7

smaller. prevention of dust from stairs maybe

Question 8

top horizontal surface is ip4x or ipxxd + boards need to be of the correct fire rating.

Answer 8

smaller. prevention of dust from stairs maybe

Question 9

it earthing arrangement

Answer 9

where there is no ASD and instead use a RCM which