Element D
Electrical
ODG010107
Services
D500001 Electrical Renovation
General Design Guidelines
Part 1. General
This section supplements Design Guideline Element D5000, with specific criteria for
projects involving construction of alterations to existing buildings.
Part 2. Design Criteria
1.
The A/E is responsible for surveying existing buildings to determine if adequate
space is available for electrical work and equipment. A/E must not rely upon M. D.
Anderson furnished as-built drawings alone.
2.
Early in the design phase, arrangements must be made with the M. D. Anderson
Project Manager for access above ceilings to determine field conditions and to
locate existing electrical components and utility services.
3.
Modification versus Replacement – Where equipment must be modified to be
physically utilized in a project, the following must be evaluated:
4.
5.
a.
Determine if one manufacturer must be used for final responsibility of the
modified equipment.
b.
Determine if a legitimate cost saving will be realized by modifying the
existing equipment rather than installing new. If yes, then modification
should be considered.
Age and Physical Condition:
a.
The length of time in service of the wiring, devices and equipment should
be reviewed prior to considering reuse.
b.
The equipment should be capable of remaining in use for a minimum of 15
years of additional life or having 60 percent of remaining life, if not the
equipment shall be replaced.
c.
Where equipment has been in operation for a number of years, physical
inspection of terminals, insulation, switching contacts, control wiring etc.,
shall be examined and recommended for use by the Engineer.
Parts Availability:
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6.
7.
8.
9.
a.
After the Engineer’s site survey’s the availability of spare parts for existing
equipment should be determined.
b.
Where the project involves extending an existing system but the existing
equipment spare parts are not available, the Engineer should inform the M.
D. Anderson Project Manager in writing. Specific directions will be given at
that time.
Conduit and Junction Boxes (Boxes):
a.
Conduit and boxes in existing walls to be demolished shall be removed.
b.
Conduit and boxes in existing walls to remain shall be abandoned in place
(if not reused) and the boxes shall be provided with blank covers.
c.
Conduit in existing or new ceilings that is not intended for reuse shall be
removed back to the panel from where it originates.
d.
Conduits that had been run in the existing concrete slab shall be saw-cut off
as they enter the slab and then sealed to prevent moisture access.
Conductors:
a.
Conductors with deteriorated or damaged insulation shall be replaced.
Conductors must be meggered to assure insulation integrity.
b.
Conductors that are not to be reused shall be removed back to the nearest
junction box. Where the entire circuit is to be removed, the conductors
shall be removed back to the panelboard from which they emanate.
c.
Disconnection and removal of telephone cabling may not be the
responsibility of the Contractor. Verify with M. D. Anderson.
d.
Disconnection and removal of communication, Nurse Call, Fire Alarm
wiring, etc., shall be the responsibility of the Contractor.
e.
Contractor shall not attempt to fish new conductors through an existing
conduit with existing conductors. All conductors shall be replaced.
Wiring Devices:
a.
Remove devices that are not installed at reusable locations. Boxes shall be
blanked.
b.
Existing receptacles and switches in good condition, located at acceptable
places, may be reused. Non-hospital-grade receptacles shall be replaced
in all patient care areas, including but not limited to Exam and Treatment
Rooms, with hospital-grade receptacles.
Lighting Fixtures:
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10.
11.
a.
Lighting fixtures that cannot be reused shall be removed, including
associated wiring to ceiling-mounted junction boxes.
b.
Where fixtures are determined to be reusable in new or existing ceilings,
they shall be taken down, cleaned and re-lamped prior to re-installation. An
economic analysis of labor costs shall be made for reuse or replacement of
fixtures.
Panelboards:
a.
Consider panelboards for reuse if physical condition, ratings and circuit
capacity requirements are met.
b.
Panelboards shall be installed in new or existing electrical closets.
Corridor-mounted panel boards shall not be used without specific
instructions. Refer to other articles of this Manual for closet requirements.
c.
In major secondary distribution renovation projects, existing panelboard
back boxes may be used as pull boxes for branch circuit transfer. All
branch circuit conductors shall be tagged to identify which circuit number
they are being transferred to in the new panel. Provide a requirement, in
the Contract Documents, for the Contractor to develop and type an
accurate Circuit Directory.
d.
Provide in the Contract Documents for the Contractor to balance the loads
during the branch circuit transfer.
Owner Retained Equipment:
a.
After consulting with M. D. Anderson, determine if the following items
should be retained by the Owner:
i)
ii)
iii)
iv)
v)
vi)
vii)
b.
12.
Disconnects of 100 A (amperes) Motors and larger
Fire Alarm Devices
Nurse Call System Components
Panelboards and Circuit Breakers
Lighting Fixtures
Special Receptacles
Transformers
Contractor is to properly dispose offsite equipment not to be retained by
Owner.
Concealed or Exposed:
a.
Conceal all work wherever possible. Wherever it is physically impractical to
conceal conduits due to economic considerations, the Engineer shall
consult with the Owner to determine acceptable alternatives.
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13.
b.
All conductors shall be installed in conduit or in surface metal raceway.
c.
Where permission is granted, type AC cable (hospital grade) may be used
to fish down to outlets in existing walls as long as lengths do not exceed 3
m (10 feet). Locate a junction box directly above ceiling for the conduit
drop to the new outlet. This, however, is not permitted for emergency
circuits. Emergency circuits are to be routed in conduit.
d.
Surface metal raceways shall not be installed on the floor. Service to
equipment in open areas shall be served from under the slab or through
Tele/power poles wired from the ceiling.
Continuity of Service:
a.
Services passing through areas of remodeling shall be maintained
throughout construction period.
b.
Circuits that are modified as part of the remodeling project, which serve
areas adjacent to the construction area, shall be re-circuited as part of this
Project.
Part 3. Special Contract Document Requirements
1.
Required demolition of existing electrical systems must be indicated on the
Drawings.
2.
Specific detailing of interfaces between alterations and existing to remain shall be
clearly indicated on the Drawings.
3.
Where existing equipment must be modified to be physically used on a project,
evaluate if initial and operational cost savings will be realized by modifying the
existing equipment rather than installing new. Provide recommendations.
4.
Provide section(s) to resolve conflicts. Location of new equipment and services
must be coordinated with all involved parties. Phasing of construction work must
be coordinated with all involved parties. Phasing of construction work must be
coordinated with operation of the facility and M. D. Anderson staff and be
accounted for in the design.
5.
If M. D. Anderson wishes to retain existing electrical equipment considered
obsolete as a result of modification, A/E should note this on the demolition
drawings; otherwise, the contractor in accordance with General Conditions of the
Contract will dispose of it.
6.
Note on the drawings if applicable to the project, that services passing through
areas of renovation shall be maintained throughout the construction period.
7.
Required demolition of existing electrical systems must be indicated on the
drawings.
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8.
Specific detailing of interfaces between alterations and existing to remain shall be
clearly indicated on the drawings.
9.
Where existing equipment must be modified to be physically used on a project,
evaluate if initial and operational cost savings will be realized by modifying the
existing equipment rather than installing new. Provide recommendations.
10.
Provide section(s) to resolve conflicts. Location of new equipment and services
must be coordinated with all involved parties. Phasing of construction work must
be coordinated with all involved parties. Phasing of construction work must be
coordinated with operation of the facility and M. D. Anderson staff and be
accounted for in the design.
11.
If M. D. Anderson wishes to retain existing electrical equipment considered
obsolete as a result of modification, A/E should note this on the demolition
drawings; otherwise, the contractor in accordance with General Conditions of the
contract will dispose of it.
12.
Note on the drawings if applicable to the project, that services passing through
areas of renovation shall be maintained throughout the construction period.
Part 4. Products
1.
New equipment shall be compatible with existing components and systems to
which they interface.
2.
If existing equipment will be reused, the A/E shall check availability of spare parts.
3.
Refer to M. D. Anderson Master Construction Specifications.
Document Revision History
Issue
Date
01-01-07
Revision Description
Revisor
Initial Adoption of Element
Rev. 1
Rev. 2
Rev. 3
Rev. 4
Rev. 5
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