5. 26 05 33 Raceways and Boxes for Electrical Systems.pdf

Construction & Environmental Review BranchFBOP TECHNICAL DESIGN GUIDELINES

ISSUE DATE: 03-01-21

RACEWAYS AND BOXES FOR ELECTRICAL SYSTEMS 26 05 33-1

Sensitive But Unclassified – SBU

SECTION 26 05 33 – RACEWAYS AND BOXES FOR ELECTRICAL SYSTEMS

PART 1 - GENERAL

1.1 SUMMARY

1.2 RELATED SECTIONS AND DOCUMENTS (Not used)

1.3 SUBMITTALS (Not used)

1.4 REFERENCES AND/OR CODES

A. Standards: The design and construction of the facility shall comply with the following:

1. NFPA 70 - National Electric Code

1.5 SYSTEM DESCRIPTION

A. Design Requirements:

1. The minimum conduit size shall be 3/4 inch.

2. All conductors (power, communication, or signal) shall be installed in conduit.

3. Exposed conduits are required to be installed flat against the wall, or other vertical surface, secured with straps and non-removable security fasteners.

4. Rigid metal conduit is required, whether exposed or concealed, at all floor and security wall penetrations. Provide a protective coating at the transition point for rigid metallic conduit when conduit runs directly from concrete encasement to direct soil burial to prevent corrosive effects.

5. For electrical metallic tubing, compression fittings and metallic junction boxes are required.

6. Electrical non-metallic tubing is required to be tied at intervals not to exceed one (1) meter.

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7. Metallic sheathed cable is permitted for whip connectors to light fixtures when the electrical connection is concealed above a gypsum or acoustical tile ceiling. Cable length is limited to a maximum length of 2 meters. Metallic sheathed cable shall be limited to MC type only. AC or BX cables shall not be acceptable.

1.6 DEFINITIONS

A. The following definitions shall apply for all Division 26 Sections.

1. Concealed: Above hard and suspended ceilings, and in walls, partitions, floors, pipe chases, pipe shafts, duct shaft, etc. In general, not visible from the occupied space.

2. Exposed: In finished and non-finished spaces, and visible from outside location. In general, visible from the occupied space.

3. Finished Spaces: All areas that require a finished ceiling. See Technical Design Guidelines Section 09 51 23 – ACOUSTICAL

TILE CEILINGS.

4. Non-finished Spaces: All areas that have an exposed structure ceiling. See Technical Design Guidelines Section 09 51 23 –

ACOUSTICAL TILE CEILINGS.

5. Secure Perimeter: The outer perimeter fence.

1.7 QUALITY ASSURANCE (Not used)

1.8 WARRANTY (Not used)

PART 2 - PRODUCTS (Not used)

PART 3 - EXECUTION

3.1 INSTALLATION

A. Exterior within the secured compound, the following methods are required:

B. Exposed - Not permitted except for under roof structures where conduit is required to be rigid metal conduit. Example of such roof structures are loading docks, canopies, etc.

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C. Underground - Concrete encased PVC rigid schedule 40. Refer to Section

26 05 43 - UNDERGROUND DUCTS AND RACEWAYS FOR

ELECTRICAL SYSTEMS for details.

D. Connection to Vibrating Equipment (including transformers and hydraulic, pneumatic, electric solenoid, or motor driven equipment): liquid tight flexible metal conduit.

Table 1 Conduit Installation - Exterior Within the Secure Compound

Condition/Specific Area

R M C

I M C

E M T

E N T

F M C

L F M C

M C

B X

A C

P V C

P V C

P V C

Exposed X7 Exposed Under Roof Structure X Exposed Behind Security Fencing

X3 X4

Exposed General Housing X5 X6 Stair Lighting and CCTV Camera

X5

Underground X Connection to Vibrating Equipment

X

Notes: Concrete Encased X Installation method permitted only if marked X1 Permitted with water tight Connections.

X2 Permitted only with cable length limited to 6.6 ft.

X3 Permitted with surface mounted on exterior wall for exterior equipment (condensers, split system units, etc) X4 Permitted from equipment disconnect to exterior disconnect.

X5 Permitted surface mounted on exterior wall for exterior lighting and security cameras at exterior stairs.

X6 Permitted from J box to light or camera at exterior stairs.

X7 Permitted for USP compound recreation yard gate controls.

Construction & Environmental Review Branch

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FBOP TECHNICAL DESIGN GUIDELINES

3.2 INSTALLATION

A. Exterior outside the secured compound, the following methods are required:

B. Exposed - Rigid metal conduit is required at heights between grade level and up to 9.8 ft. For heights above 9.8 ft., either rigid metal conduit or intermediate metal conduit is permitted.

C. Concealed - Either rigid metal conduit or intermediate metal conduit.

D. Underground - Concrete encased PVC rigid schedule 40. Refer to Section 26 05 43 - UNDERGROUND DUCTS AND RACEWAYS FOR ELECTRICAL SYSTEMS for details.

E. Connection to Vibrating Equipment (including transformers and hydraulic, pneumatic, electric solenoid, or motor driven equipment): liquid tight flexible metal conduit.

Table 2 Conduit Installation - Exterior Outside the Secure Compound

Condition/Specific Area

R M C

I M C

E M T

E N T

F M C

L F M C

M C

B X

A C

P V C

C

P V C

Exposed up to 3 Meters X Exposed Above 3 Meters X X Concealed X X Underground X Connection to Vibrating Equipment

X

Notes: Concrete Encased X Installation method permitted only if marked X1 Permitted with water tight Connections.

X2 Permitted only with cable length limited to 6.6 ft.

X3 Permitted with surface mounted on exterior wall for exterior equipment (condensers, split system units, etc) X4 Permitted from equipment disconnect to exterior disconnect.

X5 Permitted surface mounted on exterior wall for exterior lighting and security cameras at exterior stairs.

X6 Permitted from J box to light or camera at exterior stairs.

Construction & Environmental Review Branch

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FBOP TECHNICAL DESIGN GUIDELINES

3.3 INSTALLATION

A. Interior within the secured compound, the following methods are required (See Table 3):

B. Secure Electronic Equipment Rooms, Mechanical Rooms, Electrical Rooms, Sprinkler Rooms, Elevator Machine Rooms, Compressor Rooms, etc - exposed conduit is permitted using electrical metallic tubing, intermediate metal conduit, rigid metal conduit.

C. Secure Perimeter Corridor - Exposed conduit is not permitted from the finished floor to 9.8 ft. above the finished floor. Exposed conduit above

9.8 ft. is permitted using intermediate metal conduit or rigid metal conduit.

D. General and Special Housing Units - Exposed conduit is not permitted with the exception of ceilings at a height of 11.8 ft. or higher. For ceilings at a height of 11.8 ft. or higher, exposed conduit is permitted using intermediate metal conduit or rigid metal conduit. Exposed conduit is not allowed on the wall and ceiling above the mezzanine level and within two

(2) meters horizontal measurement from the handrail location.

E. Indoor Active Recreation - Exposed conduit is not permitted with the exception of the ceiling. For ceilings, exposed conduit is permitted using intermediate metal conduit or rigid metal conduit.

F. Vocational Training Shops, Factories, Maintenance Shops, and Warehouses - Exposed conduit is permitted. Rigid metal conduit is required from the finished floor to 3 meters above the finished floor.

Above 9.8 ft., exposed conduit is permitted using rigid metal conduit, intermediate metal conduit, or electrical metallic tubing.

G. Cell Chases in General and Special Housing - Exposed conduit is permitted using rigid metal conduit, intermediate metal conduit, or electrical metallic tubing.

H. Exposed - Unless specifically mentioned in sections A through F above, exposed conduit is not permitted.

I. Concealed above gypsum wallboard ceilings (offices, classrooms, exam rooms, storage, etc) - The use of either rigid metal conduit, intermediate metal conduit, or electrical metallic tubing is permitted.

J. Connection to Vibrating or Mechanical Equipment (including transformers and hydraulic, pneumatic, electric solenoid, or motor driven equipment) in wet or damp locations (kitchens, powerhouses, pump rooms, etc.): liquid tight flexible metal conduit.

K. Damp or Wet Locations - Rigid metal conduit with watertight connectors.

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L. Below On-grade Concrete Slab - PVC rigid schedule 40.

M. Unfilled CMU (masonry) - The use of either rigid metal conduit, intermediate metal conduit, or electrical metallic tubing is permitted.

N. Cast in Place Concrete (walls, slab on grade, topping slab, suspended slab, tunnel form) - The use of either rigid metal conduit, intermediate metal conduit, electrical metallic tubing, or PVC rigid schedule 40 or 80 is permitted.

O. Pre-Cast Concrete (pre-cast panels, tilt-up, concrete modules, pre-cast elements) - The use of either rigid metal conduit, intermediate metal conduit, electrical metallic tubing, PVC rigid schedule 40 or 80, or electrical non-metallic tubing is permitted.

P. Embedded in Structural Footing for Lightning Protection Down Leads - Either electrical nonmetallic tubing or rigid nonmetallic conduit is required.

Q. Embedded in grout filled CMU - PVC rigid schedule 40 or 80, electrical metallic tubing .

3.4 INSTALLATION

A. Interior outside the secured compound, the following methods are required (See Table 4):

B. Guard Tower Stairs (not including the Guard Tower CAB), Secure Electronic Equipment Rooms, Mechanical Rooms, Electrical Rooms, Sprinkler Rooms, Elevator Machine Rooms, Compressor Rooms, etc -exposed conduit is permitted using electrical metallic tubing, intermediate metal conduit, rigid metal conduit.

C. Dormitories - Exposed conduit is not permitted with the exception of ceilings at a height of 3.6 meters or higher. For ceilings at a height of 3.6 meters or higher, exposed conduit is permitted using intermediate metal conduit or rigid metal conduit.

D. Central Utility Plant, Vocational Training Shops, Garage/Landscape, Factories, Maintenance Shops, and Warehouses - Exposed conduit is permitted. Use rigid metal conduit from the finished floor to 3 meters above the finished floor. Above 9.8 ft., use rigid metal conduit, intermediate metal conduit, or electrical metallic tubing.

E. Exposed - Unless mentioned in A through C above, exposed conduit is not permitted.

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F. Concealed above ceilings (either acoustic tile or gypsum board) - Use rigid metal conduit, intermediate metal conduit, or electrical metallic tubing.

G. Connection to Vibrating or Mechanical equipment (including transformers and hydraulic, pneumatic, electric solenoid, or motor driven equipment) in wet or damp locations (kitchens, powerhouses, pump rooms, etc.): Liquid-tight flexible conduit.

H. Damp or Wet Locations - Rigid metal conduit with watertight connectors.

I. Below On-grade Concrete Slab - PVC rigid schedule 40.

J. CMU (masonry) - Use rigid metal conduit, intermediate metal conduit, or electrical metallic tubing.

K. Cast in Place Concrete (walls, slab on grade, topping slab, suspended slab, tunnel form) - The use of either rigid metal conduit, intermediate metal conduit, electrical metallic tubing, or PVC rigid schedule 40 or 80 is permitted.

L. Pre-Cast Concrete (pre-cast panels, tilt-up, concrete modules, pre-cast elements) - The use of either rigid metal conduit, intermediate metal conduit, electrical metallic tubing, PVC rigid schedule 40 or 80, or electrical non-metallic tubing is permitted.

M. Embedded in Structural Footing for Lightning Protection Down Leads - Electrical nonmetallic tubing or rigid nonmetallic conduit.

N. Embedded in grout filled CMU - PVC rigid schedule 40 or 80, electrical metallic tubing.

Table 3 Conduit Installation - Interior Within the Secure Compound

Condition/Specific Area

R M C

I M C

E M T

E N T

F M C

L F M C

M C

B X

A C

P V C

C

P V C

Exposed - Security Electronics Room

X X X

Exposed - Mechanical Room X X X Exposed - Electrical Room X X X Exposed - Sprinkler Room X X X

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Table 3 Conduit Installation - Interior Within the Secure Compound

Condition/Specific Area

R M C

I M C

E M T

E N T

F M C

L F M C

M C

B X

A C

P V C

C

P V C

Exposed - Elevator Machine Room

X X X

Exposed - Compressor Room X X X Secure Perimeter Corridor - up to 3 meters Secure Perimeter Corridor -above 3 meters

X X

General Housing General Housing - Ceilings above 3.6 meters

X X

General Housing - Exposed in Cell Chase

X X X

Special Housing Special Housing - Ceilings above 3.6 meters

X X

Special Housing - Exposed in Cell Chase

X X X

Indoor Recreation - Ceilings X X Vocational Training - up to 3 meters

X

Vocational Training - above 3 meters

X X X

Factories - up to 3 meters X Factories - above 3 meters X X X Maintenance Shops - up to 3 meters

X

Maintenance Shops - above 3 meters

X X X

Warehouses - up to 3 meters X Warehouses - above 3 meters X X X Other Exposed Areas

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Table 3 Conduit Installation - Interior Within the Secure Compound

Condition/Specific Area

R M C

I M C

E M T

E N T

F M C

L F M C

M C

B X

A C

P V C

C

P V C

Concealed Above Gypsum Board Ceilings

X X X

Concealed Above Gypsum Board Ceiling - Light Fixture Connection

X2

Connection to Vibrating Equipment

X

Damp/Wet Locations X1 Below On-Grade Concrete Slab

X

Unfilled CMU Masonry X X X Cast-in-Place Concrete (Walls, Slabs, Tunnel Forms)

X X X X X

Pre-Cast Concrete (Panels, Tilt-Up, Modules, Element)

X X X X X X

Embedded in Structural Footing (Lightning Protection)

X X X

Embedded in Grout Filled

CMU

X X

Embedded in Structural Footing (Lightning Protection)

X X X

Embedded in Grout Filled

CMU

X X

Notes: Concrete Encase Ductbank X Installation method permitted only if marked X1 Permitted with water tight Connections.

X2 Permitted only with cable length limited to 2 meters.

Table 4 Conduit Installation - Interior Outside the Secure Compound

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Condition/Specific Area

R M C

I M C

E M T

E N T

F M C

L F M C

M C

B X

A C

P V C

C

P V C

Guard Tower Stairs X X X

Exposed - Security Electronics Room

X X X

Exposed - Mechanical Room X X X

Exposed - Electrical Room X X X

Exposed - Sprinkler Room X X X

Exposed - Elevator Machine Room

X X X

Exposed - Compressor Room X X X

Central Utility Plant - up to 3 meters

X

Central Utility Plant - above 3 meters

X X X

Vocational Training - up to 3 meters

X

Vocational Training - above 3 meters

X X X

Garage/Landscape - up to 3 meters

X

Garage/Landscape - above 3 meters

X X X

Factories - up to 3 meters X

Factories - above 3 meters X X X

Maintenance Shops - up to 3 meters

X

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Maintenance Shops - above 3 meters

X X X

Warehouses - up to 3 meters X

Warehouses - above 3 meters X X X

Other Exposed Areas

Concealed Above Gypsum Board Ceilings

X X X

Concealed Above Gypsum Board Ceiling - Light Fixture Connection

X2

Connection to Vibrating Equipment

X

Damp/Wet Locations X1

Below On-Grade Concrete Slab

X

Unfilled CMU Masonry X X X

Cast-in-Place Concrete (Walls, Slabs, Tunnel Forms)

X X X X X

Pre-Cast Concrete (Panels, Tilt-Up, Modules, Element)

X X X X X X

Embedded in Structural Footing (Lightning Protection)

X X X

Embedded in Grout Filled

CMU

X X

Notes: Concrete Encased Ductbank X Installation method permitted only if marked X1 Permitted with water tight Connections X2 Permitted only with cable length limited to 2 meters

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END OF SECTION 26 05 33