Page 109 - SMM2 eBOOK

R.2 Classification of work

1. Work together with its trunking, ducting and cable trays (unless associated with more than
one installation) shall be classified as follows and given Under an appropriate heading:

a. Incoming services which include high voltage switchgear, high voltage cables,
transformers, sub-station equipment and control gear and medium voltage cables.
b. Standby equipment which inclUdes inverter and battery units, generator sets and
cables to main medium voltage switchpear.
c. Mains installation which includes main medium voltage switchgear, sub-main
cables, busbar distribution and distribution boards bUt excluding finai sub-circuits.
d. Power installation.
e. Lighting installation.
f. Heating installation which includes final circuits supplying primarily electrical heating
systems or heating appliances. Installations in connection with plumbing and
engineering installations are referred to in clause R.2.1.h.
g. Electrical appliances (All appliances which do not form an integral part of another
classification shall be included under this heading.)
h. Electfical work associated with plumbing and mechanical engineering installations.
j. Telephone installation which includes both communication systems within the
building and provisions for the extemal telephone system.
k. Clock installation which includes impulse clock systems but not simple clocks fed
fnom final circuits.
I. Sound distribution installation which includes public address, bells, signal systems
and the like.
m. Alarm system installation which includes hre alarms, burglar alarms and the like.
n. Earthing system installation.
p. Lightning protection installation which includes finials, tapes, ionised protectors and
the like.
q. Special services identifying whether direct current, extra low voltage, flame-proof,
pressurised installation, etc.
r. Any other installation.
s. Trunking, ducting and cable trays associated with more than one installation.

R.3 Location of work

1. Work shall be identified in respect of location as follows:

a. Internally.
b. Externally.

Equipment and control gear

R.4 Generally

1. Unless otherwise stated, equipment (e.g. prime movens, generators, motors, fans,
mechanical drives, batteries, rectifiers, heavy duty circuit breakers, feeder pillars,
transformens and the like) and control gear (e.g. fuse and link disconnecting boxes,
isolators, change-over switches, switch fuses, fused switches, distribution boards,
contactons, motor starters, busbar chambers and the like) shall be described and
enumerated.

2. Packaged items of equipment and control gear shall be described in conjunction with a
manufacturers detailed specification.

3. Any limiting dimensions on the size of equipment shall be given.

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