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220 CMR 126.00 UNDERGROUND ELECTRIC SUPPLY AND COMMUNICATION LINES 50,000 VOLTS AND BELOW Section 220 CMR 126.00
UNDERGROUND ELECTRIC SUPPLY AND COMMUNICATION
LINES 50,000 VOLTS AND BELOW
Section
126.01: Definitions
126.30: Purpose, Scope and Application of Rules
126.31: General Requirements Applying to Underground Lines
126.32: Underground Conduit Systems
126.33: Supply Cable
126.34: Cable in Conduit Systems
126.35: Direct Buried Cable
126.36: Risers
126.37: Supply Cable Terminations
126.38: Equipment
126.01: Definitions
The following definitions are for use with the Massachusetts Department of
Public Utilities Code for Underground Electric Supply and Communication Lines. For
other use and for definitions not contained herein, see "Definitions of Electrical Terms"
(ANSI C-42.100-1972).
Appliance. Current-conducting, energy-consuming equipment, fixed or portable; for
example, heating, cooking, and small motor-operated equipment.
Automatic. Self-acting, operating by its own mechanism when actuated by some
impersonal influence -- as, for example, a change in current strength; not manual,
without personal intervention. Remote control that requires personal intervention is not
automatic, but manual.
Backfill (when used as a noun). Materials such as sand, crushed stone, soil, etc., that
are placed to fill an excavation.
Ballast Section (Railroads). The section of material, generally trap rock, which
provides support under railroad tracks.
Bonding. The electrical interconnection of conductive parts, e.g., cable sheaths,
armors or enclosures, designed to maintain a common electrical potential.
Cable. A conductor with insulation, a stranded conductor with or without insulation
and other coverings (single-conductor cable) or a combination of conductors insulated
from one another (multiple-conductor cable).
Current-Carrying Part. A conducting part intended to be connected in an electric circuit to a source of voltage. Non-current-carrying parts are those not intended to be
so connected.
Cable Sheath. A conductive protective covering applied to cables.
Note: A cable sheath may consist of multiple layers of which one or more is
conductive.
Cable Terminal (Termination). A device which provides insulated egress for the
conductors.
Circuit. A conductor or system of conductors through which an electric current is
intended to flow.
Conductor. A material, usually in the form of a wire, cable, or bus bar, suitable for
carrying an electric current.
Conductor Shielding. An envelope which encloses the conductor of a cable and
provides an equipotential surface in contact with the cable insulation.
Conduit. A structure containing one or more ducts.
Note: Conduit may be designated as iron pipe conduit, tile conduit, etc. If it
contains one duct only, it is called "single-duct conduit," if it contains more than
one duct it is called "multiple-duct conduit," usually with the number of ducts as
a prefix, viz., two-duct multiple conduit.
Conduit System. Any combination of duct, conduit, conduits, manholes, handholes and
vaults joined to form an integrated whole.
De-Energized (Dead). Free from any electrical connection to a source of potential
difference and from electrical charges: not having a potential different from that of the
earth.
Note: The term is used only with reference to current-carrying parts which are
sometimes energized (alive or live).
Department. The Department of Public Utilities, Commonwealth of Massachusetts.
Duct. A single enclosed raceway for conductors or cable.
Enclosed. Surrounded by a case, cage or fence, which will protect the contained
equipment and prevent accidental contact of a person with live parts.
Energized (Alive or Live). Electrically connected to a source of potential difference, or
electrically charged so as to have a potential significantly different from that of the
earth in the vicinity. The term "live" is sometimes used in place of the term
"current-carrying," where the intent is clear, to avoid repetition of the longer term. Equipment. A general term which includes fittings, devices, appliances, fixtures
apparatus, and the like used as part of, or in connection with, a supply or
communications installation.
Electric Supply Equipment (Supply Equipment). Equipment which produces, modifies,
regulates, controls, or safeguards a supply of electric energy.
Exposed. Not isolated or guarded.
Fire-Proofing (of Cables). The application of a fire-resistant covering.
Grounded. Connected to or in contact with earth or connected to some extended
conducting body which serves instead of the earth.
Grounded Effectively (Effectively Grounded). Intentionally connected to earth through
a ground connection or connections of sufficiently low impedance and having sufficient
current-carrying capacity to prevent the building up of voltages which may result in
undue hazard to connected equipment or to persons.
Grounded System. A system of conductors in which at least one conductor or point is
intentionally grounded, either solidly or through a current-limiting device (not a
current-interrupting device).
Grounding Conductor. A conductor which is used to connect the equipment or the
wiring system with a grounding electrode or electrodes.
Guarded. Covered, fenced, enclosed, or otherwise protected by means of suitable
covers or casings, barrier rails or screens, mats or platforms, designed to prevent
dangerous approach or contact by persons or objects.
Note: Wires which are insulated but not otherwise protected are not considered
as guarded.
Handhole. An opening in an underground system containing cable and/or equipment
into which workmen reach but do not enter.
Insulated. Separated from other conducting surfaces by a dielectric substance
(including air space) offering a high resistance to the passage of current.
Note: When any object is said to be insulated, it is understood to be insulated in
a suitable manner for the conditions to which it is subjected. Otherwise, it is,
within the purpose of 220 CMR 126.00, uninsulated. Insulating covering of
conductors is one means of making the conductor insulated.
Insulation (as applied to cable). That which is relied upon to insulate the conductor
from other conductors or conducting parts or from ground. Insulation Shielding. An envelope which encloses the insulation of a cable and
provides an equipotential surface in contact with the cable insulation.
Isolated (as applied to objects). Not readily accessible to persons unless special means
of access are used.
Jacket. A protective covering over the insulation, core, or sheath of a cable.
Joint Use. Simultaneous use by two or more kinds of utilities.
Communication Lines. The conductors and their supporting or containing structures
which are used for public or private signal or communication service, and which
operate at potentials not exceeding 400 volts to ground or 750 volts between any two
points of the circuit, and the transmitted power of which does not exceed 150 watts.
When operating at less than 150 volts no limit is placed on the capacity of the system.
Under specified conditions, communication cables include communications circuits not
complying with the preceding limitations where such circuits are also used to supply
power incidentally to communications equipment.
Note: Telephone, telegraph, railroad-signal, data, clock, fire, police-alarm,
community television antenna and other systems conforming with the above are
included. Lines used for signaling purposes, but not included under the above
definition, are considered as supply lines of the same voltage and are to be so
run.
Electric Supply Lines (Supply Lines). Those conductors used to transmit electric
energy and their necessary supporting or containing structures. Signal lines of more
than 400 volts wire to wire are always supply lines within the meaning of the rules, and
those of less than 400 volts wire to wire may be considered as supply lines, if so run
and operated throughout.
Manhole. A subsurface enclosure which personnel may enter and which is used for the
purpose of installing, operating, and maintaining submersible equipment and/or cable.
Manhole Cover. A removable lid which closes the opening to a manhole or similar
subsurface enclosure.
Manhole Grating. A grid which provides ventilation and a protective cover for a
manhole opening.
Manual. Capable of being operated by personal intervention.
Padmounted. A method of supporting equipment, gener