Sept. 6.] THE NEW ZEALAND GAZETTE. 2549

corrosive gas, fume, and/or liquid is present, or liable to be
present, special precautions shall be taken to prevent corrosion
or deterioration of the earthing-clip and earthing-lead.

(2) For armoured cables such clips shall be so designed as
to grip firmly the wires of the armouring without damage to
the insulation.

(3) For lead-sheathed armoured cables the principal con-
tact shall be with the lead, but the clip shall be so designed
as to grip the armouring firmly without damage to the lead.

PART 35.—RADIO APPARATUS.

35–01. Every transformer which is used with any radio
apparatus and which is, or which may be, in electrical contact
with any submain or subcircuit which is connected to a
service-main shall—

(a) Be of the double-wound type in which the primary
winding is effectively separated from all other
windings by adequate insulation capable of with-
standing the test prescribed by Regulation 62–41
hereof; and

(b) Be of such design, construction, and material that
no accessible part of the transformer shall rise to a
temperature higher than 176° F.

35–02. Every resistance which is used with any radio ap-
paratus and which is, or which may be, in electrical contact
with any submain or subcircuit which is connected to a service-
main shall be of such design, construction, and material that
no accessible part of the resistance shall rise to a temperature
higher than 176° F.

35–03. Where condensers used with any radio apparatus
are connected in series across any submain or subcircuit
which is connected to a service-main the mid-point between
the condensers shall not be connected to the chassis nor
shall a condenser be connected between the chassis and such
submain or subcircuit.

35–04. Every battery-eliminator shall comply with the
following requirements:—

(a) It shall be enclosed in a case of metal or of some material
that is tough, not readily combustible, and non-
hygroscopic; and

(b) Such case shall be adequately ventilated and of such
design, construction, and material as reasonably to
prevent all risk of causing injury to any person.

35–05. Every condenser which is used with any radio
apparatus and which is, or which may be, in electrical contact
with any submain or subcircuit which is connected to a
service-main shall be capable of withstanding the test
prescribed by Regulation 62–42 hereof.

PART 36.—MARKING OF ACCESSORIES, APPLIANCES,
LAMPS, AND SWITCHES.

36–01. There shall be permanently and legibly marked—

(a) The maker’s name, or registered trade-mark, or
registered trade-name on all appliances, lamps,
adaptors, ceiling-roses, cut-outs, circuit-breakers,
flexible cord connectors, lamp-holders, plugs and
sockets, and switches; and

(b) The maximum operating voltage and amperage on all
cut-outs, circuit-breakers, flexible cord connectors,
plugs and sockets, and switches other than switch
lamp-holders, switches not exceeding 1·25 amperes
rating if incorporated in an appliance or fitting, and
pendant switches save that in the case of pendant
switches the maximum operating voltage shall be
marked thereon; and

(c) The operating voltage and either amperage or wattage
on all appliances; and

(d) The operating voltage and the amperage, or wattage,
or lumens, or candle-power on all lamps other than
series street-lighting lamps.

36–02. Where alternative ratings are marked on any
appliance, accessory, or apparatus, such appliance, accessory,
or apparatus shall be capable of withstanding the prescribed
tests at the highest marked rating.

PART 37.—GENERAL.

37–01. All apparatus shall be so designed, proportioned,
and constructed that it will carry its rated load at all times
without heating to an extent which will cause risk of break-
down of its insulation.

37–02. All material used in the construction of any acces-
sory, fitting, appliance, or apparatus shall, where practicable,
be non-ignitable. Where the use of ignitable material is
necessary, such material shall not come in contact with any
part the temperature of which exceeds 212° F. and unless
adequately separated therefrom by fire-resisting material,
shall be maintained at a distance from all parts in which
this temperature is exceeded sufficient to avoid any risk of
fire.

37–03. Resistances, control gear, and all apparatus, other
than apparatus designed and intended for heating and cooking
purposes, shall be so arranged that in normal operation no
accessible part of the enclosing case can rise to a temperature
exceeding 176° F.

37–04. The connecting terminals of every apparatus in
which heat is generated shall be so arranged that connecting
cables are not exposed to temperatures in excess of those
permitted under these regulations for the class of insulation
to be used, the terminals being situated to facilitate the
connecting cables entering from below where this is necessary
to avoid exposure to any such excess temperatures.

DIVISION IV.—INSTALLATION I.

PART 41.—ELECTRICAL PLANT.

GENERATORS.

41–01. (1) Generators, other than flame-proof, forced-
draught, induced-draught, or pipe-ventilated machines shall
be placed in well-ventilated rooms where inflammable or
explosive dust or gas cannot accumulate under normal
conditions. In situations where inflammable or explosive
materials are stored or handled generators may be placed only
if adequately protected to the satisfaction of the Authorized
Inspector.

(2) Generators shall be placed in positions in which they
are not exposed to risk of mechanical injury, or to damage
from water, steam, or oil.

41–02. Adequate precautions shall be taken in the installa-
tion of every generator as will ensure immunity from electrical
hazard.

TRANSFORMERS, RESISTANCES, AND CHOKE-COILS.

41–11. (1) Transformers, resistances, and choke-coils
operating at other than extra-low pressure shall, unless cased,
be carried on supports of incombustible material.

(2) In situations where in the opinion of an Authorized
Inspector inflammable or explosive gas, dust, or flyings are
liable to be present the transformers shall be oil-immersed or
gas-tight.

41–12. Adequate precautions shall be taken in the installa-
tion of every transformer, resistance and choke-coil as will
ensure immunity from electrical hazard.

41–13. Auto-transformers, resistances, or choke-coils shall
not, except as provided in the next succeeding regulation, be
used to reduce the voltage to low pressure or extra-low
pressure—

(a) To supply general wiring in buildings; or

(b) For any other purpose where the low pressure or extra-
low pressure circuit or apparatus has exposed live
metal with which it is possible for any person to
make accidental contact.

41–14. Notwithstanding anything in the last preceding
regulation resistances or choke-coils may be used for—

(a) Battery charging; and

(b) Arc lamps, provided that the maximum potential
difference across the terminals of the arc or any
part of the circuit between such resistance or choke-
coil and the arc does not exceed 50 volts.

SECONDARY BATTERIES.

41–21. When apparatus is supplied from a secondary
battery the work of connecting such apparatus to such
battery shall be done in accordance with the provisions of
these regulations which would govern the connecting of such
apparatus with a generating plant developing the same
difference of potential.

41–22. Every battery shall be so arranged that the difference
in potential between adjacent cells does not exceed 50 volts
unless adequate protection is provided against electrical
hazard. Each cell shall be readily accessible from the top
and from at least one side.

41–23. The room in which any battery is placed shall
be thoroughly ventilated.

41–24. Suitable apparatus shall be provided for controlling
the current with which a battery is being charged.

41–25. Where a battery is being charged through a
resistance or rectifier such resistance or rectifier shall be
connected·in the live conductor between the source of supply
and the battery. The supply to the battery shall be controlled
by a suitable switch fixed in an accessible position.

41–26. Every portable battery shall while being charged
from a source of supply exceeding extra-low pressure be
placed so that an attendant can handle the battery only
while standing upon a wooden platform, or other insulated
platform, suitably designed and placed so as to prevent
the accumulation of acid or water in contact with it.