5.10 Additions and Alterations

New additions, similar to newly constructed buildings, must meet all mandatory measures for the prescriptive and performance method of compliance. Prescriptive requirements, including the lighting power densities, must be met if the prescriptive method of compliance is used. If the performance approach is used and the new addition includes envelope or mechanical systems in the performance analysis, the lighting power densities may be traded-off against other system energy budgets.

Alterations to indoor lighting systems that include 10 percent or more of the existing luminaires serving an enclosed space must meet the indoor lighting alteration requirements in §141.0(b)2I. Indoor lighting alterations include adding luminaires, removing and reinstalling luminaires, modifying luminaires, or combining the replacement of lamps and ballasts or drivers. Alterations to wiring serving lighting are also lighting alterations.

Any space with a lighting system installed for the first time must meet the same lighting requirements as a newly constructed building.

5.10.2 Additions

The nonresidential indoor lighting of the addition shall meet either the prescriptive approach or the performance approach.

When using the performance approach, the indoor lighting in the addition must meet the lighting requirements of §110.0, §110.9, §130.0 through §130.5, and one of the following two options of the performance requirements:

1. The addition alone meet §140.1|topic=SECTION 140.1 – PERFORMANCE APPROACH\: ENERGY BUDGETS

5.10.3 Alterations – General Information

5.10.3.1 Scope

Alterations to existing nonresidential, hotel/motel, or relocatable public-school buildings or alterations in conjunction with a change in building occupancy to a nonresidential, or hotel/motel occupancy shall meet one of the following requirements:

i. Any change to a building water-heating system, space-conditioning system, lighting system, electrical power distribution system, or envelope that is not an addition.

An altered component is defined by the Energy Code as a component that has undergone an alteration and is subject to all applicable requirements.

5.10.3.2 Indoor Lighting Alteration Exceptions

The following indoor lighting alterations are not required to comply with the lighting requirements in the Energy Code:

1. Alterations where less than 10 percent of existing luminaires in an enclosed space are being altered.

2. Alteration of portable luminaires, luminaires affixed to moveable partitions, or lighting excluded by §140.6(a)3.

4. Any alteration that would directly cause the disturbance of asbestos unless the alterations are made in conjunction with asbestos abatement.

5. Alterations limited to addition of lighting controls or replacing lamps, ballasts, or drivers.

5.10.3.3 Skylight Exception

When the daylighting control requirements of §130.1(d) are triggered by the addition of skylights to an existing building and the lighting system is not re-circuited, the daylighting control need not meet the multilevel requirements in §130.1(d). Daylit areas must be controlled separately from nondaylit areas. An automatic control must be able to reduce lighting power by at least 90 percent when the daylit area is fully illuminated by daylight.

5.10.3.4 Alterations – Performance Approach

5.10.3.5 Alterations – Prescriptive Approach

5.10.4 Indoor Lighting Alterations

Alterations to the lighting systems must comply with the requirements in §141.0(b)2I when 10 percent or more of the luminaires serving an enclosed space are altered.

The Energy Code compliance goals for the lighting alterations are twofold. First, the installation must meet the lighting power requirements; second, the installation must provide lighting controls.

The Energy Code allows three options for meeting the installed power and associated control requirements and specifies a set of requirements for lighting power allowance and controls for each of the following cases:

1. The altered lighting power does not exceed the indoor lighting power requirements specified in §140.6,

2. The altered lighting power is equal to or less than 80 percent of indoor lighting power requirements specified in §140.6, or

3. The alteration is a one-for-one luminaire alteration within a building or tenant space of 5,000 sq. ft. or less, and the total wattage of the altered luminaires is at least 40 percent lower compared to the total prealteration wattage.

Altered lighting systems must meet one of the three requirements above for lighting power allowance. Options 1 and 2 require the lighting power allowance to be calculated according to §140.6.

Option 3 allows the maximum installed lighting power to be determined by taking a percentage of the existing installed lighting power, rather than measuring the square footage of the space and multiplying it by a lighting power allowance. Option 3 is allowed only for one-for-one luminaire alterations. One-for-one is defined as either replacement of whole luminaires one for one, in which the only electrical modification involves disconnecting the existing luminaire and reconnecting the replacement luminaire, or when components of a luminaire are modified without replacing the entire luminaire.

5.10.4.1 Indoor Lighting Alteration Control Requirements

Option 1 requires indoor lighting alterations to meet all the mandatory control requirements that are applicable to the project. The control requirements include manual area controls, multilevel controls, automatic shutoff controls, daylighting controls, and demand-responsive controls.

Options 2 and 3 are likely to result in a lower lighting power than Option 1; therefore, indoor lighting alterations must meet manual area control and automatic shut off control requirements. In offices larger than 250 square feet, occupant sensing shutoff controls are not required for Options 2 and 3. Multilevel lighting controls (§130.1[b]), daylighting controls (§130.1[d]), and demand-responsive controls (§130.1[e]) are not required for Options 2 and 3.

Alterations to indoor lighting systems shall not prevent the operation of existing, unaltered controls and shall not alter controls to remove functions specified in §130.1. Alterations to indoor lighting systems are not required to separate existing general, floor, wall, display, or decorative lighting on shared circuits or controls. New or completely replaced lighting circuits shall comply with the control separation requirements of §130.1(a)4 and 130.1(c)1D.

The acceptance testing requirement of §130.4 is not required for alterations where lighting controls are added to control 20 or fewer luminaires for the entire alteration project.

Table 5-3 (Modified from Table 141.0-F): Control Requirement for Indoor Lighting Alteration

Control Specifications	Control Specifications	Projects complying with §141.0(b)2Ii (Option 1)	Projects complying with §141.0(b)2Iii and §141.0(b)2Iiii (Option 2 and 3)
Manual Area Controls	130.1(a)	Required	Required
Manual Area Controls	130.1(a)2	Required	Required
Manual Area Controls	130.1(a)3	Only required for new or completely replaced circuits	Only required for new or completely replaced circuits
Multilevel Controls	130.1(b)	Required	Not Required
Automatic Shut Off Controls	130.1(c)1	Required; 130.1(c)1D only required for new or completely replaced circuits	Required; 130.1(c)1D only required for new or completely replaced circuits
Automatic Shut Off Controls	130.1(c)2	Required	Required
Automatic Shut Off Controls	130.1(c)3	Required	Required
Automatic Shut Off Controls	130.1(c)4	Required	Required
Automatic Shut Off Controls	130.1(c)5	Required	Required
Automatic Shut Off Controls	130.1(c)6	Required	Required; except for 130.1(c)6D
Automatic Shut Off Controls	130.1(c)7	Required	Required
Automatic Shut Off Controls	130.1(c)8	Required	Required
Daylighting Controls	130.1(d)	Required	Not Required
Demand-Responsive Controls	130.1(e)	Required	Not Required

Example 5-32: Warehouse Luminaire Alteration With 40 Percent Lighting Power Reduction

Question

All existing luminaires in a warehouse facility of 5,000 sq. ft. are proposed to be replaced by LED luminaires (shown below). There are 100 existing metal halide luminaires, and each uses 250 watts, all of which will be replaced. The replacement LED luminaires use 150 watts each. How is compliance being determined, and what controls are required?

Answer

The compliance option of §141.0(b)2iii requires a 40 percent reduction in installed lighting power for one-to-one luminaire alterations within a building or tenant space of 5,000 square feet or less. Thus, enter the number and wattage of the existing luminaires into NRCC-LTI, and use the form to calculate both the existing installed lighting power (100 x 250 W = 25,000 W) and the maximum allowance based on a 40 percent reduction (25,000 W x 0.6 = 15,000 W). Enter the number and wattage of the new luminaires into NRCC-LTI, just like any other project. This is a one-for-one replacement, so the total lighting power of the new luminaires meets the allowance (100 x 150 W = 15,000 W).

Since the alteration meets §141.0(b)2Iiii, only manual area controls and automatic shut off controls are mandatory as specified in Table 141.0-F (Table 5-2 in this manual).

Example 5-33: Lighting Wiring Alterations

Question

If the lighting system is being rewired as part of a lighting alteration project, which Energy Code requirements must be complied with?

Answer

Alterations to lighting wiring are considered alterations to the lighting system, so the requirements are the same as for lighting system alterations. Only altered components of the alteration must meet applicable requirements. For example, rewiring or relocating existing controls will trigger applicable requirements for the existing controls. If existing luminaires are not altered, they would not be held to alteration requirements such as lighting power allowance requirements or additional control requirements in §141.0(b)2I.

Altered lighting circuits must comply with the control requirements as specified in §130.1(a)3.

The acceptance testing requirements are triggered if controls are added to control more than 20 luminaires.

Example 5-34: Alterations Projects Replacing Both Lamps and Ballasts of the Luminaires

Question

There are 100 lighting fixtures in an existing office space. For 20 fixtures, the internal components (lamps and ballasts) are being replaced with retrofit kits.

Which Energy Code requirements apply?

Answer

Example 5-35: One-for-One Alterations in Enclosed Spaces With One Luminaire

Question

A project includes more than 50 luminaires with one-for-one alterations on a floor, but a portion of those altered luminaires are in enclosed spaces containing one luminaire.

How are the luminaires in the enclosed spaces counted toward the trigger threshold of 50 luminaires under §141.0(b)2I in a one-for-one luminaire alteration?

Answer

Although Exception 2 to §141.0(b)2I exempts enclosed spaces with one luminaire from the requirements of §141.0(b)2I, it does not reduce the total luminaire count on a floor or a tenant space. Therefore, the altered luminaires on the floor that are not in the spaces with one luminaire are required to meet the requirements of either §141.0(b)2Ii, §141.0(b)2Iii, or §141.0(b)2Iiii.

Example 5-36: Lamp Replacements as Part of a Project

Question

A single-story retail store has 50 T12 linear fluorescent strip luminaires and two sections of track lighting. One of the tracks has 10 screw-in incandescent flood lights and the other track has 10 pin-based halogen PAR lamps. The linear luminaires are being retrofitted with T8 lamps and premium ballasts. In the track luminaires, the screw-in and pin-based incandescent lamps are being replaced with equivalent screw-in and pin-based LED lamps. There are no other alterations done to the lighting system of that tenant space in the calendar year.

What are the Energy Code requirements for this project?

Answer

There are a total of 70 luminaires (50+10+10 = 70 luminaires).

Out of the 70 fixtures included in the project, the 20 incandescent fixtures consist of lamp replacement only and do not count toward the trigger threshold of more than 50 luminaires under §141.0(b)2I (one-for-one luminaire alteration). Only 50 luminaires are being altered in this job. The Energy Code is not triggered for this project because 50 or fewer fixtures are being modified.

If occupancy sensing controls are added to a suite of office spaces, does this addition trigger the requirements of §141.0(b)2I (Indoor Lighting Alterations)?

Answer

No, since the alterations are limited to the addition of occupancy sensing controls, it does not trigger any of the requirements of §141.0(b)2I.

Example 5-38: Daylighting Requirements for Large Enclosed Spaces

Question

A 30,000 ft² addition has a 16,000 ft² space with an 18-ft. high ceiling and a separate 14,000 ft² space with a 13 ft high ceiling. The lighting power density in this building is 1 W/ft². Do skylights have to be installed in the portion of the building with 18-foot ceiling?

Answer

Yes. Section 140.3(c) requires daylighting in enclosed spaces that are greater than 5,000 ft² directly under a roof with a ceiling height over 15 feet. In this example the area with a ceiling height greater than 15 feet is 16,000 ft²; therefore, prescriptive daylighting requirements apply. (Note: Daylighting requirements do not apply in Climate Zones 1 and 16).

Example 5-39: Daylighting Requirements for Alterations

Question

A preexisting air-conditioned 30,000 ft² warehouse with a 30 ft. ceiling and no skylights will have its general lighting system replaced as part of a conversion to a big box retail store. Are skylights prescriptively required?

Answer