WHATS NEW IN 2002

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RANDOM SEPARATION
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RANDOM SEPARATION
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RARANDOM SEPARATION
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RANDOM SEPARATION
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IDENTIFICATION MARKING BURIED CABLE
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WHATS NEW IN 2002?
NESC SUBCOMMITTEE 7

• NESC Significant Changes
• Underground Lines

O. Chuck Amrhyn NESC Chairman July 19, 2001
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New NESC Rule 323C5

• 5. Any manhole greater than 1.25 m (4 ft) in
  depth shall be designed so it can be entered by
  means of a ladder or other suitable climbing
  device. Equipment, cables and hangers are not
  suitable climbing devices.
• Reason This rule was added because it was not
  adequately covered in the code.

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New NESC Rule 350H

• H. The rules in this section also apply to direct
  buried supply and communications cables installed
  in duct that is not part of a conduit system.
• (the section referenced above is section 35,
  rules for direct buried cables)
• Also a NOTE will be added at the beginning of
  section 32
• (Underground Conduit Systems) thusly

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New NESC Rule 350H (cont.)

• For cables installed in a single duct not part
  of a conduit system, the rules in section 35
  apply.
• Reason This rule was added to clarify the
  intent of the code that the direct buried
  cable rules in Section 35 apply to direct
  buried cable in duct that is not part of
  conduit system.

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Revised NESC Rule 351A1

• 351A1 Cables should be located so as to be
  subject to the least disturbance practical. When
  cables are Cables to be installed parallel to
  other subsurface structures, but if this is not
  practical, the rules on separation in Rule 352
  353 or 354 shall should be followed.

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Revised NESC Rule 351A1 (cont.)
Reason This rule was revised to allow joint
use trench without qualifications as to the
practicality of it. Joint trench has become
an accepted normal practice, and if the
appropriate rules are followed, it is a safe
practice.
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Revised NESC Rule 352 and 354

• Presently the separation rules require a 12
  separation between supply cables and other
  underground structures, including gas and other
  fuel lines. If this is not practical, or
  conditions do not permit it, then a separation of
  less than 12 (random lay) is OK, provided all
  parties affected are in agreement and the random
  lay rules are followed.

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Revised NESC Rule 352 and 354(cont.)

• The revised rules on separation will be two
  distinct rules
• (1) Revised Rule 353 for deliberate separation
  (Equal to or Greater Than 12), And
• (2) Revised Rule 354 for random separation (Less
  Than 12).

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The most significant change is new NESC Rule
354A2 which states

• 354A2. Radical separation of supply and
  communication cables or conductors from steam
  lines, gas and other fuel lines shall be not
  less than 12 inches and shall meet Rule 353.
• The present rules do not allow a supply cable and
  gas line to have a separation of less than 12
  provided all the affected parties agree, but the
  new Rule 354A2, as stated above, will not allow a
  radical separation less than 12, even if the
  parties agree to it, or if they are owned by the
  same utility. The 2002 edition will have no
  exceptions.

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Reason This rule was added because of the
concerns between supply and communication
cables and gas lines as to adequate
separation.
New Rule 354A2 (cont.)
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Revised NESC Rule 353D1, Table 353-1, Exception

• Exception Where conflicts with other underground
  facilities exist, street light cables operating
  at not more than 150 volts to ground may be
  buried at a depth not less than 450 mm (18 in).
• Reason This rule was revised because the
  original intent was to allow a lessor depth only
  where other underground structures existed. The
  burial depth should correlate with voltage, not
  the type of system being installed.

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New NESC Rule 380D

• D. Padmounted equipment, pedestals and
  otherabove ground enclosures should be
  located not less than1.2 m (4 ft) from
  firehydrants.
• ExceptionWhere conditions do not permit a
  clearance of 1.2 m (4ft), a clearance of not less
  than 900 mm (3 ft) is allowed.
• Reason This rule was added because padmounted
  equipment creates the same problems for firemen,
  as do overhead structures. It will also now be
  consistent with the overhead clearance section.

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Revised NESC Rule 381G1

• 381 G1. Padmounted and other above ground
  equipment shall have an enclosure that is either
  locked or otherwise secured against unauthorized
  entry.
• Reason This rule was revised so that
  non-padmounted equipment, such as secondary
  pedestals are included.