Pennsylvania Code › Title 34 - LABOR AND INDUSTRY › Part I - Department of Labor and Industry › Chapter 43 - TUNNEL CONSTRUCTION AND COMPRESSED AIR WORK › Subchapter A - TUNNEL CONSTRUCTION AND WORK IN COMPRESSED AIR › GENERAL PROVISIONS › Section 43.1 - Definitions

Current through Register Vol. 54, No. 28, July 13, 2024
The following words and terms, when used in this
						subchapter, have the following meanings, unless the context clearly indicates
						otherwise:
Blaster
-Any person designated by the
						superintendent to supervise blasting operations who shall be charged with the
						responsibility of properly thawing explosives, preparing and fixing charges,
						firing and approaching misfires.
Bulkhead
-A longitudinal or transverse
						partition separating the tunnel into sections or chambers.
Caisson
-A wood, steel, concrete, or
						reinforced concrete air and watertight chamber in which it is possible for men
						to work to excavate material.
Carrying capacity
-Carrying a capacity of
						a given wire as prescribed for various insulated wires in Chapter 39,
						Subchapter B (relating to electric safety).
Constructor
-The person, firm, or body
						corporate in immediate control of the construction of any tunnel or its
						accessories, and as such responsible for the condition and management
						thereof.
Difference of potential
-The difference
						of electrical potential, as determined by a voltmeter, existing between any two
						points of an electrical system or between any point of such a system and the
						earth.
Employe
or
person
						employed
-Any person receiving compensation for labor or services
						performed on the works.
Explosive
-Any compound or mixture
						containing any ingredients in such proportions, quantities, or packing that an
						ignition of any part of the compound or mixture may cause pressures capable of
						destroying life, limb or contiguous objects.
Flammable
-aterial which readily ignites
						or burns.
Foreman
-A person in charge of a
						subdivision of work or of the entire work and under the instructions of the
						superintendent.
Grounding
-Connecting any part of an
						electrical system to the earth so that there is no material difference of
						potential between such part and the earth.
Guarded, encased,
or
enclosed
-An object so covered, fenced or surrounded that
						contact at the point of danger is remote.
High voltage supply
-The supply of
						electricity if the difference of potential between any two points of the
						circuit may at any time exceed 650 volts.
Lock
-A chamber designed to facilitate
						the passage of men and materials from an air pressure greater than normal, as
						in a compartment, caisson or tunnel, to the ground or water level or normal air
						pressure. This term shall include the following:
(i)
Emergency lock
-A lock
					 designed to hold and permit the quick passage of an entire shift.
(ii)
Man lock
-A lock through
					 which only men pass.
(iii)
Medical lock
-A lock to which men suffering from compressed air
					 diseases (bends) may be removed for medical attention.
Low voltage supply
-The supply of
						electricity if the difference of potential between any two points of the
						circuit does not exceed 300 volts.
Magazine
-Any building or other structure
						or place in which explosives are stored or kept, whether above or below
						ground.
Medium voltage supply
-The supply of
						electricity if the difference of potential between any two points of the
						circuit may, at any time, exceed 300 volts, but which shall not exceed 650
						volts.
Nuisance
-Any horseplay or any offensive
						or obnoxious practice that endangers the lives, limbs, or health of persons
						employed.
Person
-A firm or corporation as well as
						natural persons.
Potential
or
voltage
-Electrical pressure.
Potential of a circuit
-The potential
						normally existing between the conductors of such circuit or the terminals of
						such machines or apparatus.
Shaft
-An excavation made from the
						surface of the ground, the longer axis of which is steeper than 45° with
						the horizontal.
Shafting
-An air and watertight shaft
						built in the roof of the caisson and extended upward until above the normal
						water level.
Superintendent
-The person resident on
						the work having general supervision and responsibility.
Tunnel
-A subterranean passage or
						chamber.
Tunnel heading
-The section of a tunnel
						where excavation work for driving the tunnel is being carried on.
Underground
-Within the limits of any
						shaft or tunnel.
Underground station
-Any place where
						electrical machinery is permanently installed in the tunnel.
Works
-Any or all parts of a tunnel
						excavated or being excavated as well as shafts and approaches, powerhouses,
						lumberyards, storage yards and structures of all kinds in the immediate
						vicinity used in connection with the excavation or the immediate disposal of
						excavated material or in connection with the construction of the tunnel
						lining.