MAY 21.] THE NEW ZEALAND GAZETTE. 1541

ground until after it has been sent to the surface and there
properly repaired.

267. In any part of a mine in which inflammable gas,
     although not normally present, is likely to occur in quantity
     sufficient to be indicative of danger—

(a.) All cables, apparatus, signalling-wires, and signalling-
instruments shall be constructed, installed, pro-
tected, worked, and maintained so that in the
normal working thereof there shall be no risk of
open sparking.

(b.) All motors shall be constructed so that when any part
is live all rubbing-contacts (such as commutators
and slip-rings) are so arranged or enclosed as to
prevent open sparking.

(c.) The pressure shall be switched off apparatus forthwith
if open sparking occurs, and during the whole time
that examination or adjustment disclosing parts
liable to open sparking is being made. The pressure
shall not be switched on again until the apparatus
has been examined by the electrician or one of his
duly appointed assistants and the defect (if any)
has been remedied or the adjustment made.

(d.) Every electric lamp shall be enclosed in an airtight
fitting, and the lamp-globe itself shall be hermetic-
ally sealed.

(e.) A safety-lamp shall be provided and used with each
motor when working, and should any indication of
fire-damp appear from such safety-lamp the person
appointed to work the motor shall forthwith cut off
the pressure therefrom, and report the matter to a
fireman-deputy or other official.

(f.) Haulage by electric locomotives on the trolley-wire
system is prohibited.

268. With the consent in writing first obtained of the
     Minister in all cases, and subject to such conditions affecting
     safety as may be prescribed by him, haulage by electric
     locomotives on the trolley-wire system or by storage-battery
     locomotives may be used in mines in which inflammable gas
     does not occur in quantity sufficient to be indicative of
     danger.

269. (1.) Current from lighting or power circuits shall not
     be used for firing shots.

(2.) Shot-firing cables shall be covered and protected as
provided by Regulation 265 (1) for flexible cables. Adequate
precautions shall be taken to prevent them from touching
other cables and apparatus.

270. (1.) Where electricity is used for signalling, the pres-
     sure in any one circuit shall not exceed 25 volts.

(2.) Contact-makers shall be so constructed as to prevent
the accidental closing of the circuit.

(3.) Adequate precautions shall be taken to prevent signal
and telephone wires from touching cables and apparatus.

271. Any of the requirements of this part of these regula-
     tions shall not apply in any case in which exemption is
     obtained from the Minister on the ground either of emergency
     or special circumstances, on such conditions as the Minister
     may prescribe.

ELECTRICITY ON SURFACE.

272. The preceding provisions pertaining to electricity shall
     apply to apparatus used above ground, subject to the following
     amendments:—

(1.) In Regulation 250 and Regulation 266 (3) the words
“at the surface of the mine” shall be substituted in every
case for the words “in the mine.”

(2.) Regulations 253, 254, 255 (d), 173, 258 (2), 263 (1,)
267, 269, and 270 (1) shall not apply.

(3.) The following regulation shall be substituted for
Regulation 258 (1) thereof:—

“Where necessary to prevent danger or mechanical damage,
apparatus shall be placed in a separate room, compartment,
or box of fireproof construction. Inflammable or explosive
material shall not be stored in any such room, compartment,
or box.”

(4.) Regulation 260 (2) is amended by adding thereto the
words: “Except that in the case of a portable lamp or
other portable apparatus of small current capacity, connected
to the system by means of a flexible cable complying with
Regulation 265 (1), the cross-sectional area of the earthing-
conductor in the flexible cable shall not be required to be
greater than the cross-sectional area of either of the live
conductors in the same flexible cable.”

(5.) The following regulation shall be substituted for
Regulation 264 thereof:—

“Unless so placed or otherwise safeguarded as to prevent
danger, all cables other than flexible cables for portable
apparatus and signal and telephone wires shall comply with
the following requirements:—

“(a.) They shall be covered with insulating-material
(except that the outer conductor of a concentric
system may be bare). The lead sheath of lead-
sheathed cables and the iron or steel armouring of
armoured cables shall be of not less thickness re-
spectively than is recommended by the British
Engineering Standards Association.

“(b.) They shall be efficiently protected from mechanical
damage and supported at sufficiently frequent
intervals and in such a manner as adequately to
prevent danger and damage to the cables.

“(c.) Concentric cables, or two-core or multi-core cables
protected by a metallic covering, or single-core
cables protected by a metallic covering which shall
contain all the conductors of the circuit, shall be
used (i) where the pressure exceeds low pressure and
(ii) where there may be risk of igniting coal-dust
or other inflammable material: Provided that if
the medium-pressure direct-current system is used,
two single-core cables protected by metallic cover-
ings may be used for any circuit.

“(d.) Cables unprotected by a metallic covering shall be
properly secured to efficient insulators.

“(e.) The metallic covering of every cable shall be (i)
electrically continuous throughout; (ii) earthed, if
it is required by Regulation 260 (1) to be earthed,
by a connection to the earthing system of not less
conductivity than the same length of the said
metallic covering; (iii) efficiently protected against
corrosion where necessary; (iv) of a conductivity at
all parts and at all joints at least equal to 50 per cent.
of the conductivity of the largest conductor enclosed
by the said metallic covering; and (v) where there
may be risk of igniting coaldust or other inflammable
material, so constructed as to prevent as far as is
practicable any fault or leakage of current from the
live conductors from causing open sparking.

“(f.) Cables and conductors where jointed up to motors,
transformers, switch-gear, and other apparatus shall
be installed so that (i) they are mechanically pro-
tected by securely attaching the metallic covering
(if any) to the apparatus, and (ii) the insulating
material at each cable, and is efficiently sealed so as
to prevent the diminution of its insulating pro-
PERTIES. Where necessary to prevent abrasion there
shall be properly constructed bushes.”

(6.) Regulation 265 (3) is amended to read: “At every
point where flexible cables for portable apparatus are joined
to main cables a switch capable of entirely cutting off the
pressure from the flexible cables shall be provided.”

(7.) Regulation 266 (6) shall not apply.

(8.) The following regulation shall be substituted for
Regulation 266 (8) thereof:—

“The person authorized to work an electrically driven
portable machine shall not leave the machine while it is
working, and shall, before leaving the machine, ensure that the
pressure is cut off from the flexible trailing cable which sup-
plies such portable machine. Trailing cables shall not be
cragged along by the machine when working.”

(9.) The last sentence of Regulation 266 (9) shall not apply.

(10.) In Regulation 270 (2) the words “used for signalling”
shall be inserted after “contact-makers.”

PENALTY.

273. The fine payable for a breach of any of the foregoing
     regulations shall, where no penalty is elsewhere provided, be
     for a first offence not exceeding £5, and for a second or
     subsequent offence not exceeding £10.

SCHEDULE.

FORM 1. [Reg. 6.

The Coal-mines Act, 1908.

FIRST-CLASS MINE-MANAGER’S CERTIFICATE (BY EXAMINA-
TION).

No. Office of Board of Examiners,
Wellington, , 19 .

THIS is to certify that [State the name in full, address, and
occupation of person examined] has produced a certificate
from his previous employers that he has been actually en-
gaged in underground workings in a mine for the necessary
period, and has passed a satisfactory written and oral examina-
tion as a first-class mine-manager of a coal-mine, as required
by the Coal-mines Act, 1908, and the regulations made
thereunder.

A. B.,
Chairman of Board of Examiners.

Entered, Vol. , folio .
C. D., Secretary.