prescriptive approach...10/12/2015 slide 116 prescriptive approach 1,270.7 w main entry lobby main...

PRESCRIPTIVE APPROACH

1. Actual and Allowed LPD

2. Complete Building Method

3. Area Category Method

4. Tailored Method

This section contains exercises for lighting power adjustments,

Complete Building Method, and Area Category Method.

The exercises are designed to follow the forms and Certificates

of Compliance for Nonresidential indoor Lighting.

SECTION 7

THE COMPLIANCE PROCESS

There are two major steps to Title 24 compliance:

1. Meet all mandatory requirements by installing required controls and

devices and ensuring that they have all of the required functionality.

2. Meet all prescriptive or performance requirements by ensuring that the

actual lighting power installed in a space is less than the allowed lighting

power for that space.

SLIDE 91 10/12/2015 PRESCRIPTIVE APPROACH

SECTION 7

ACTUAL LIGHTING POWER

The actual indoor lighting power of the proposed

building area is the total wattage of all planned,

permanent and portable lighting systems,

adjusted by the following:

1. Reduction of wattage through controls beyond

what the standards require

2. Lighting wattage exclusions

10/12/2015 PRESCRIPTIVE APPROACH SLIDE 92

SECTION 7

ACTUAL LIGHTING POWER: REDUCTION THROUGH CONTROLS

If you exceed the mandatory controls

requirements by installing a control where

it is not required, you are eligible for a

Power Adjustment Factor (PAF). This

will result in a lower calculated lighting

power use for the installed system.

( Controlled W ) X ( PAF from 140.6-A )

= Lighting Power Reduction

For example, a 480 ft2 open office plan

with an occupancy control is eligible for a

PAF of 0.2. Given that the controlled

lighting in that space totaled 100W :

(100W) X (0.2) = 20W of excluded

lighting power (80W total)


SECTION 7

ACTUAL LPD: LIGHTING WATTAGE EXCLUDED

Wattage of many lighting applications may be excluded, including:

• Studio lighting for film or photography and for a videoconferencing studio

• Equipment that is for sale and for demonstration

• Lighting installed by the manufacturer in vending machines, scientific and

industrial equipment, refrigerated cases, walk-in freezers, and food

preparation equipment

SLIDE 94

Photo: Jessie Whiteman

10/12/2015 PRESCRIPTIVE APPROACH

SECTION 7

ALLOWED LIGHTING POWER

The allowed indoor lighting power for each building or area is

calculated using one of the following methods:

• Complete Building Method

• Area Category

• Tailored Method

Each of these methods involves multiplying the square footage of a space by

the allowed wattage per square foot for that space.


SECTION 7

AREA CATEGORY METHOD


SECTION 7

AREA CATEGORY METHOD

The total allowed lighting power for the building is the sum of all allowed lighting

powers for all areas in the building. An “area” is all adjacent spaces which are

associated with a single function type listed in TABLE 140.6-C.

(TABLE 140.6-C ) X (floor area of area) = Allowed Lighting Power for that area


Photo Credit: Acuity Brands

SECTION 7

ADDITIONAL POWER ALLOTMENTS

Additional lighting power is allowed under the Area Category Method for:

• Specialized task work lighting

• Ornamental lighting

• White board lighting


Photo Credit: Finelite Photo Credit: Tech Lighting

SECTION 7

TABLE 140.6-C: AREA CATEGORY METHOD—

LIGHTING POWER DENSITY VALUES


SECTION 8

PRESCRIPTIVE APPROACH IN PRACTICE


The following example will show the steps to determine whether the actual lighting

power of a project will comply with the allowed lighting power budget using the

Area Category Method:

1. Calculate the lighting power allowance

2. Calculate the total installed lighting power for all planned lighting from a lighting schedule

3. Exclude portable task lighting power for the office areas, using an option available under the

Area Category Method

4. Apply control credits earned by specifying lighting controls that go beyond code requirements

5. Determine the adjusted lighting power using answers from steps one through four

6. Compare the adjusted installed lighting power to the allowed lighting power

This section concludes with an example calculation of allowed lighting power using

the Complete Building Method to compare results with the Area Category Method.

SECTION 8

PRESCRIPTIVE APPROACH IN PRACTICE


Forms Reference

This example includes notes on what sections of the Certificates of

Compliance for Nonresidential Indoor Lighting are necessary for this

scenario. Forms can be downloaded from the Energy Commission's website:

energy.ca.gov/title24/2013standards/nonresidential_manual.html.

Note: The forms included in this module have been adapted for the purpose of the exercises.

Please download the complete forms on the California Energy Commission website.

NRCC-LTI-02-E: Indoor Lighting—Lighting Controls

NRCC-LTI-01-E: Indoor Lighting

NRCC-LTI-03-E: Indoor Lighting Power Allowances

SECTION 8

J.S.H. ASSOCIATES


J.S.H Associates is a 1,944-square-foot office building.

OFFICE INFORMATION

• Open Office: 532 ft2

• Private Office: 222 ft2

• Conference Room: 252 ft2

• Main Lobby: 228 ft2

• Kitchen: 156 ft2

• Corridors: 278.5 ft2

• Restroom 1: 51 ft2

• Restroom 2: 51 ft2

• Copy Room: 89.25 ft2

SECTION 8

J.S.H. ASSOCIATES: 1,944 FT2 OFFICE BUILDING

SECTION 8

PORTABLE LIGHTING

Symbol Luminaire Quantity Watts System

Wattage

Efficacy

(Lumens/Watt)

45” LED UNDERCABINET LIGHTING Finelite Edge Undercabinet

10 12.2 W 122 W 62.2

LED TASK LIGHT Koncept Z Bar Mini Task Light

6.5 22.5 W 6.5 W —

Total Portable Lighting Watts: 128.5 W

INDOOR LIGHTING SCHEDULE


Symbol Luminaire Quantity Watts System

Wattage

Efficacy

(Lumens/Watt)

2x2 LED RECESSED TROFFER Cree CR22

15 35 W 525 W 90–100

1X4 1-LAMPFLUORESCENT RECESSED TROFFER Finelite HPR w/ Sylvania 32W T8 lamp; Sylvania Quicktronic Ballast

4 28 W 112 W 89

2X4 2-LAMP FLUORESCENT RECESSED TROFFER Finelite HPR w/ Sylvania 32W T8 lamp; Sylvania Quicktronic Ballast

2 54 W 108 W 89

6” LED RECESSED DOWNLIGHT Cree LR6

12 12 W 144 W 90

LED WALL SCONCE Tech Lighting Mura

6 8 W 48 W 50

8’ LED SUSPENDED LUMINAIRE Lunera Lighting L7-G3

1 85 W 85 W 84

8’ LED LINEAR WALL MOUNT LUMINAIRE Finelite Muro-Oval

1 45.2 W 45.2 W 57.3

LED PENDANT Philips Vetro

3 10 W 30 W 76

LED SUSPENDED LUMINAIRE Philips Ledino Cinta Suspension Light

2 22.5 W 45 W 100

Total Installed Lighting Watts: 1,142.2 W

TOTAL LIGHTING WATTS: 1,270.7 W

SECTION 8

DETERMINING COMPLIANCE WITH THE AREA CATEGORY METHOD


SECTION 7

SUMMARY OF ALLOWED LIGHTING POWER


SECTION 8

1. LIGHTING POWER ALLOWANCE


REQUIRED FORMS:

NRCC-LTI-03-E: Indoor Lighting Power Allowance

C-2 Area Category Method General Lighting Power Allowance

1. Determine the allowed lighting power of each area according to Table 140.6-C.

2. Determine the square feet of each area type.

3. Calculate the wattage allowance by multiplying the square feet of each area type

by the additional watts allowed

4. Total the allowed watts.

SECTION 8

J.S.H ASSOCIATES: 1,944 FT2 OFFICE BUILDING

RESTROOM #1

51 ft2

RESTROOM #2

51 ft2

COPY ROOM

89.25 ft2 CORRIDOR

278.5 ft2

KITCHEN

156 ft2

OPEN OFFICE

532 ft2

PRIVATE OFFICE

222 ft2

CONFERENCE ROOM

252 ft2 MAIN ENTRY LOBBY

228 ft2

SECTION 7

C-2. AREA CATEGORY METHOD

GENERAL LIGHTING POWER ALLOWANCE


Open Office

Private Office

0.75

1.0

532 ft2

222 ft2

399 W

222 W

1,797 W

Conference Room

Main Lobby

1.2

1.5

252 ft2

228 ft2

302.4 W

342 W Kitchen

Corridors

1.6

0.6

156 ft2

278.5 ft2

249.6 W

167.1 W Restroom #1

Restroom #2

0.6

0.6

51 ft2

51 ft2

30.6 W

30.6 W

Copy Room

Office Area > 250ft2

Office Area ≤ 250ft2

Classroom, Lecture, Training, Vocational

Main Entry Lobby

Kitchen, Food Preparation

Corridor, Restroom, Stair, & Support



Corridor, Restroom, Stair, & Support 0.6 89.25 ft2 53.7 W

1859.75 ft2

SECTION 8

ADDITIONAL LIGHTING WATTAGE ALLOWANCE


REQUIRED FORMS:


C-3 Area Category Method Additional Lighting Wattage Allowance

1. Determine the allowed lighting power of each area according to Table 140.6-C.

2. Determine the square feet of the office primary function area.

For white board lighting, determine the linear feet of whiteboard

3. Calculate the wattage allowance by multiplying the square feet of each area type

by the additional watts allowed

4. Choose the smaller of either the newly calculated allowed watts or the total design

watts of the luminaire

5. Total the additional allowed watts.

SECTION 7

C-3. AREA CATEGORY METHOD

ADDITIONAL LIGHTING WATTAGE ALLOWANCE


Classroom

Main Entry Lobby

7 ft

228 ft2

5.5 W/LF

0.5 W/ft2

38.5 W

114 W

Whiteboard Lighting: Finelite Muro Wall Mount 45.2 W 38.5 W

Ornamental: Philips Ledino Cinta Suspended Luminaire

61 W

22.5 W 22.5 W

SECTION 8

TOTAL LIGHTING POWER ALLOWANCE


REQUIRED FORMS:


C-1 Area Category Method Total Lighting Power Allowances

Calculate the adjusted installed lighting power by adding the additional lighting

wattage allowance to the general lighting power allowance.

1,797 W + 61 W = 1,858 W total allowed lighting power

SECTION 7



1,858 W

SECTION 8

2. INSTALLED LIGHTING POWER


REQUIRED FORMS:


C. Indoor Lighting Schedule and Field Inspection Energy Checklist

The installed lighting power includes all planned permanent and portable

lighting. Complete the lighting schedule in "C. Indoor Lighting Schedule

and Field Inspection Energy Checklist" to determine the total to use for

compliance purposes.

SECTION 7

C. INDOOR LIGHTING SCHEDULE AND

FIELD INSPECTION ENERGY CHECKLIST


2x2 LED Recessed Troffer 35 W x 12 420 W Office Area > 250ft2

Office Area > 250ft2




45” LED Undercabinet Lighting

2x2 LED Recessed Troffer

LED Task Light

LED Suspended Luminaire

12.2 W

35 W

6.5 W

22.5 W

x

x

x

x

10

3

1

1

122 W

105 W

6.5 W

22.5 W

#

#

#

#

#

6” LED Recessed Downlight 12 W x 4 48 W Classroom, Lecture, Training

Classroom, Lecture, Training

Classroom, Lecture, Training

8’ LED Suspended Luminaire

8’ LED Linear Wall Mount Luminaire

85 W

45.2 W

x

x

10

3

85 W

45.2 W

#

#

#

SECTION 7

C. INDOOR LIGHTING SCHEDULE AND

FIELD INSPECTION ENERGY CHECKLIST


1,270.7 W

Main Entry Lobby

Main Entry Lobby

Main Entry Lobby

6” LED Recessed Downlight

LED Pendant

LED Suspended Luminaire

12 W

22.5 W

10 W

x

x

x

5

1

3

60 W

22.5 W

30 W

#

#

#

Corridor, Restroom, Support Area

Corridor, Restroom, Support Area

1x4 T8 Fluorescent Recessed Troffer

2x4 T8 Fluorescent Recessed Troffer

28 W

54 W

x

x

4

2

112 W

108 W

Corridor, Restroom, Support Area 6” LED Recessed Downlight 12 W x 3 36 W

Corridor, Restroom, Support Area LED Wall Sconce 8 W x 6 48 W

#

#

#

#

SECTION 8

3. INSTALLED PORTABLE LUMINAIRES IN OFFICES


REQUIRED FORMS:


B. Installed Portable Luminaires in Offices—Exception to Section 140.6(a)

When calculating actual lighting power, there is an exception to Section 140.6(a)

that states that up to 0.3 watts per square foot of portable lighting for office

areas shall not be required to be included in the calculation of actual indoor

Lighting Power Density.

• For the Complete Building Method, include the total wattage for portable

lighting into the installed lighting total.

• This section is used to determine if greater than 0.3 W of portable lighting is

planned for any office.

Two portable luminaires in the offices

• LED undercabinet lighting in the open office area

• LED task light in the private office

SECTION 8

3. INSTALLED PORTABLE LUMINAIRES IN OFFICES


REQUIRED FORMS:


B. Installed Portable Luminaires in Offices—Exception to Section 140.6(a)

Two portable luminaires in the offices

• LED undercabinet lighting in the open office area

• LED task light in the private office

1. Multiply the watts per luminaire by the number of luminaires to determine

installed portable luminaire watts in this office.

2. Determine the square feet of each office primary function area.

3. Divide the installed portable luminaire watts by the square feet of the office to

determine watts per square foot.

4. Determine accountable wattage by multiplying the square feet of the office

primary function area by the watts per square feet. If the watts per square foot

is ≤ 0.3, claim 0 W of accountable watts for installed portable luminaires.

SECTION 7

B. INSTALLED PORTABLE LUMINAIRES IN OFFICES —

EXCEPTION TO SECTION 140.6(A)


LED undercabinet lighting 12.2 W 10 122 W

LED task light 6.5 W 1 6.5 W

532ft2

222ft2

0.23 W/ft2

0.03 W/ft2

0

0

Office > 250 ft2

Office ≤ 250 ft2

0

0

0 W

P

P

P

The new Installed Lighting total with the exclusion of portable luminaire wattage is 1,178.2

SECTION 8

4. LIGHTING CONTROL CREDITS


REQUIRED FORMS:


Mandatory and Prescriptive Indoor Lighting Control Schedule,

PAF Calculation, and Field Inspection Checklist

This lighting plan exceeds the mandatory requirements for lighting controls

• Partial-ON occupancy controls in the restrooms and copy room

Complies with §130.1(a), §130.1(c), and §140.6(a)2

• Combined manual dimming plus partial-ON occupant sensing control in

the conference room controlling pendants and suspended luminaire

Complies with §130.1(a), §130.1(b), §130.1(c), §130.1(d), and §140.6(a)2

SECTION 7

MANDATORY AND PRESCRIPTIVE INDOOR LIGHTING CONTROL

SCHEDULE, PAF CALCULATION, AND FIELD INSPECTION CHECKLIST


Restroom #1 Partial-ON occupancy Sensor 5.6

55.65 W

Restroom #1 Partial-ON occupancy Sensor 5.6

Copy Room Partial-ON occupancy Sensor

1

1

1

28 W

28 W

56 W

0.20

0.20

0.20 11.2

Conference Room Combined Manual Dimming and Partial-ON

Occupancy Sensor

1 133 W 0.25 33.25

P

P

P

P

P P P E

P P P E

P P P E

E

E

E

P P P P P E

SECTION 8

5. ADJUSTED LIGHTING POWER


REQUIRED FORMS:


Summary of Allowed Lighting Power

Use the "Summary of Allowed Lighting Power" in Form NRCC-LTI-01-E to

calculate the adjusted installed lighting power by adding the portable lighting and

subtracting the lighting control credits from the total installed lighting.

1,142.2 W + 0 W – 55.65 W = 1,086.55 W total adjusted installed lighting power

SECTION 7

6. COMPARE ADJUSTED INSTALLED LIGHTING POWER TO

ALLOWED LIGHTING POWER


1,858 W

1,142.2 W

0 W

55.65 W

1,086.55 W

Our lighting plan is compliant.

REQUIRED FORMS:



SECTION 7

COMPLETE BUILDING METHOD


SECTION 7

COMPLETE BUILDING METHOD

The Complete Building Method may only be used on projects involving entire

buildings with one primary type of use or in mixed-use buildings or tenant spaces

where 90% of the spaces have one primary use.

This is the simplest way to comply with the standards, and many will attempt this

method first before trying one of the two more complex methods.

(TABLE 140.6-B ) X (floor area of entire building ) = Allowed Lighting Power


SECTION 8

LIGHTING POWER ALLOWANCE


REQUIRED FORMS:


B. Complete Building Method Lighting Power Allowance

1. Determine the allowed lighting power density of an office building according to

Table 140.6-B.

2. Multiply the allowed lighting power density by the area of the space.

SECTION 7

B. COMPLETE BUILDING METHOD LIGHTING POWER ALLOWANCE


Office Building 0.8 W/ft2 1,944 ft2 1,555.2 W

1,555.2 W

1,555.2 W

1,306.7 W

P

SECTION 7

REQUIRED FORMS:





1,270.7 W

55.65 W

1,215.05 W

1,555.2 W

Our lighting plan is compliant.

SECTION 7

TAILORED METHOD


SECTION 7

TAILORED METHOD

This is the most granular of the three methods.

• Allowances for each area (just like area category)

• Allowances for display and task lighting within an area

Allowed lighting power is determined by the occupancy type and the

physical characteristics (e.g. ceiling height) of a space.

See Table 140.6-D for details.


SECTION 7

ALLOWANCES UNDER THE TAILORED METHOD

The Tailored Method adds additional lighting power allowances for:

• Wall displays

• Floor displays

• Task lighting

• Ornamental/special effects lighting

• Very valuable display cases

These lighting power allowances cannot be used in any space other

than the display or task area. Any wattage not covered by these

allowances must be deducted from the general lighting allowance for

that area.


SECTION 7

EXTERIOR SPACES


Photo: Cree

SECTION 7

LIGHTING ZONES

Lighting Zone 1: Government parks, recreation areas, and wildlife preserves

Ambient Illumination: Dark

The local entity with authority over the property will know if the property is a

government designated park, recreation area, or wildlife preserve. If the park is

within a rural or urban area, it can be considered a part of lighting zone two or three.

Lighting Zone 2: Rural Areas

Ambient Illumination: Low

Rural areas include any population, housing, and territory that contain

less than 2,500 people.


SECTION 7

LIGHTING ZONES

Lighting Zone 3: Urban Areas

Ambient Illumination: Medium

An urban area is a densely settled core of census tracts that contain

at least 2,500 people.

Lighting Zone 4: Special Use District

Ambient Illumination: High

This zone may be created by a local government through application

to the California Energy Commission and is used for special area

types that require a particularly high amount of light.


SECTION 7

LIGHTING POWER ALLOWANCES

The allowed lighting power for a space is determined by measuring

the area of the installation and multiplying by the lighting power

allowance for that space.

The actual lighting power is the total watts of all non-exempt lighting

systems (including ballast, driver, or transformer losses).


SECTION 7


When determining allowed lighting power, the

number of luminaires, their mounting heights, and

their layout affect the size of the illuminated area and

thus the allowed lighting power for a space.

The illuminated area is any hardscape area within

a square around each luminaire or pole, less any

obstructions. The size of this square is 10 times the

luminaire mounting height, with the luminaire in

the middle of the square.


SECTION 7


There are three major areas that are considered when determining the

allowed lighting power for a space:

Area Wattage Allowances (AWA)

The Area Wattage Allowance is determined for the total illuminated

hardscape area.

Linear Wattage Allowances (LWA)

The Linear Wattage Allowance is determined for the total perimeter

length of the hardscape. The total hardscape perimeter does not

include areas that are not illuminated.

Initial Wattage Allowances (IWA)

The Initial Wattage Allowance may be used once per project site.

The IWA provides additional wattage for small sites or for unusual

hardscape geometries.


SECTION 7



SECTION 7

PLANTERS AND LANDSCAPE AREAS

Planters and small landscape areas are included

within the general hardscape area as long as the

width or length of the inclusion is less than 10 ft.,

and the inclusion is bordered on at least three sides.

Landscape areas that are greater than 10 ft. in both

width and length are excluded from the general

hardscape area calculation, but the perimeter of

these exclusions may be included in the linear

wattage allowance (LWA) calculation


prescriptive approach...10/12/2015 slide 116 prescriptive approach 1,270.7 w main entry lobby main...

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