Section 55: No person other than a skilled person or person in control Skilled

• persons only shall enter or be caused or permitted to enter transformer to enter houses or switch-houses unless all live conductors therein which tra:sfo:m~r are not adequately insulated against the possibility of inadvertent ~~us~;.ltc human contact are effectively bratticed off; provided that the skilled person may in case of necessity be assisted by any unskilled person acting under his immediate personal supervision. For the purpose of this rule " a skilled person " means a person who has been sufficiently instructed in the particular work that he is called upon to do to appreciate the dangers attaching thereto . . 56. Where in any premises in which electrical apparatus is Installed there may be risk of igniting gas, coal-dust or other explosive material flame-proof or explosion-proof apparatus shall be provided by the owner. Provision of flame-proof and explosion-proof apparatus. 1860 Cap. 218] Machinery (Safe Working & Inspection) Traction. Persons not to drive engines or operate brakes except under Persons not to travel on truck or haulage rope without Clearance between double lines. SPECIAL PROVISIONS RELATING TO TRACTION. 57. {l) Where traction is operated by machinery other than a locomotive a signalling apparatus shall be provided at all stations by which distinct signals can be given- (i) to the engine-driver if the traction is operated by (ii) to the brake operator if the traction is operated by gravity and exceeds 150 feet in length. {2) On every inclined plane at intervals not exceeding 500 feet one or more effective contrivances shall be provided and used to arrest trucks or other vehicles should they run or move out of control down such inclined plane; provided that this sub-rule shall not apply to inclined planes where the gradient is such that trucks cannot run out of control. Where trucks are to be operated by a rope, they shall be properly attached to the rope before being moved into, or placed in, a position from which a runaway can occur. {3) Where the before-mentioned effective contrivances are hand-operated, every person operating the same shall be afforded adequate protection from any. truck or vehicle moving out of · control.