1 Scope

NOTE This standard covers the materials, ratings, configuration, installation, and testing of individually enclosed low-voltage switches and disconnects rated 600V and below and used as service, feeder, motor, and equipment disconnecting means. (1.1)

NOTE The work includes fusible and non-fusible enclosed safety switches, enclosed molded-case switches, and the door interlocks, lockout provisions, neutral and grounding arrangements, and enclosures that accompany them. (1.2)

NOTE An enclosed switch provides a manually operable, visible, and lockable means of disconnecting a circuit or piece of equipment from its supply; a fusible switch additionally provides branch or feeder overcurrent protection through its fuses. (1.3)

1.4 Enclosed switches shall be listed and labeled to UL 98 by a Nationally Recognized Testing Laboratory.

1.5 Enclosed switches shall be applied and installed in accordance with NFPA 70, including Article 404 for switches, Article 408 where the switch is part of distribution equipment, Article 430 Part IX for motor disconnecting means, and Article 440 for air-conditioning and refrigerating equipment.

NOTE A non-fusible switch contains no overcurrent device and depends entirely on an upstream overcurrent protective device for short-circuit and overload protection; it provides isolation only. (1.6)

1.7 Assemblies Covered

NOTE Switches covered by this standard are individually enclosed air switches, manually operable by an external handle, with all current-carrying parts enclosed, rated 600V and below and 1200A and below. (1.7.1)

NOTE For assemblies that subdivide a feeder into branch circuits with individual overcurrent devices, see PanelboardsPanelboardsResolves to the current edition.sync/panelboards. (1.7.2)

NOTE For drawout power circuit breaker assemblies and higher fault-duty distribution, the switch is part of switchboard or switchgear scope and is not covered here. (1.7.3)

1.8.1 Line and load conductors terminating in the switch shall comply with Conductors And CablesConductors and CablesResolves to the current edition.sync/conductors-and-cables.

1.8.2 Raceways and conduit entering the switch enclosure shall comply with Raceways And ConduitRaceways and ConduitResolves to the current edition.sync/raceways-and-conduit.

1.8.3 Switches serving motor loads fed from motor control centers shall be coordinated with Motor Control CentersMotor Control CentersResolves to the current edition.sync/motor-control-centers.

1.8.4 The equipment grounding and any service or system bonding at the switch shall comply with Grounding And BondingGrounding and Bonding for Electrical SystemsResolves to the current edition.sync/grounding-and-bonding.

1.8.5 Switch identification and warning labels shall follow Equipment LabelingElectrical Equipment LabelingResolves to the current edition.sync/equipment-labeling.

1.8.6 The available fault current used to select the switch SCCR and any series rating shall be taken from the project arc-flash and short-circuit study per Arc Flash StudyArc-Flash Hazard AnalysisResolves to the current edition.sync/arc-flash-study.

2 Referenced Standards

2.1 Equipment, materials, and installation shall comply with the latest adopted edition of the following standards and codes.

Standard	Title
NFPA 70	National Electrical Code (Articles 110, 230, 240, 250, 404, 408, 430, 440)
NFPA 70E	Standard for Electrical Safety in the Workplace
UL 98	Standard for Enclosed and Dead-Front Switches
UL 50	Standard for Enclosures for Electrical Equipment, Non-Environmental Considerations
UL 50E	Standard for Enclosures for Electrical Equipment, Environmental Considerations
UL 248-1	Low-Voltage Fuses, General Requirements
NEMA KS 1	Enclosed and Miscellaneous Distribution Equipment Switches (600V Maximum)
NEMA 250	Enclosures for Electrical Equipment (1000 Volts Maximum)
OSHA 29 CFR 1910.147	The Control of Hazardous Energy (Lockout/Tagout)
NEMA FU 1	Low Voltage Cartridge Fuses
NETA ATS	Acceptance Testing Specifications for Electrical Power Equipment and Systems

2.2 Where the contract documents, the adopted building code, or a referenced standard conflict, the more stringent requirement shall govern unless the Engineer of Record directs otherwise in writing.

NOTE UL 98 is the listing standard that establishes the switch's voltage, ampere, horsepower, and short-circuit ratings, while NFPA 70 governs where and how the switch is applied as a disconnecting means. (2.3)

NOTE NEMA KS 1 defines the heavy-duty and general-duty construction classes referenced throughout this standard and the corresponding endurance and performance requirements. (2.4)

3 Submittals

3.1 Action Submittals

3.1.1 The Contractor shall submit the following for the Engineer's review and approval prior to procurement:

Product data for each switch identifying the duty class (heavy-duty or general-duty), fusible or non-fusible construction, ampere rating, voltage rating, horsepower rating, number of poles, and neutral arrangement
The UL 98 listing and the marked short-circuit current rating, including the fuse class and maximum fuse ampere rating on which a fusible switch's SCCR depends
Catalog data confirming the enclosure NEMA 250 type and the enclosure listing to UL 50 or UL 50E for the installation environment
For service-entrance-rated switches, documentation of the UL 98 service-entrance listing and the neutral bonding and equipment grounding provisions
A schedule identifying every switch on the project, its tag, the equipment it serves, its location, and its ratings
Where a series rating is relied upon, documentation of the tested series combination identifying the upstream device type and rating

Action Submittals Requiredcheckbox

☐ Product data (duty class, fusible/non-fusible, ratings, poles, neutral)

☑ UL 98 listing and marked SCCR with fuse class basis

☐ Enclosure NEMA type and UL 50 / UL 50E listing

☐ Service-entrance listing and bonding/grounding provisions (where applicable)

☐ Project switch schedule

☐ Series rating documentation (where applicable)

3.1.2 Switch procurement shall not proceed until the corresponding submittals are reviewed and returned.

3.1.3 The marked SCCR submitted for a fusible switch shall state the specific fuse class and maximum fuse ampere rating, because the assembly SCCR is established only with those fuses installed.

3.2 Closeout Submittals

3.2.1 The Contractor shall provide the following at substantial completion before the switch work is accepted:

As-built switch schedule reflecting installed locations, tags, ratings, and the equipment served
Operation and maintenance data covering fuse type and rating for each fusible switch, interlock defeat procedure, and recommended maintenance
Field test and torque records for line and load terminations
Warranty documentation

Required Closeout Submittalscheckbox

☑ As-built switch schedule

☑ Operation and maintenance data (fuse data, interlock, maintenance)

☑ Field test and termination torque records

☑ Warranty documentation

4 Quality Assurance

4.1 Listing and Labeling

4.1.1 Every enclosed switch shall be listed and labeled to UL 98 by a Nationally Recognized Testing Laboratory.

4.1.2 Each switch shall be marked with its voltage rating, ampere rating, horsepower rating, number of poles, and short-circuit current rating.

4.1.3 A switch that is not listed to UL 98, or whose marking does not display the ratings required by this standard, shall not be installed.

NOTE A horsepower rating is required for any switch applied as a motor disconnecting means, because NFPA 70 430.109 requires the disconnect to be horsepower-rated, not merely ampere-rated. (4.1.4)

4.2 Manufacturer Qualifications

4.2.1 Switches shall be the product of a manufacturer regularly engaged in producing UL 98 listed enclosed switches.

4.2.2 All switches of a given duty class on the project should be furnished by a single manufacturer so that fuse provisions, handle and interlock operation, and spare parts are consistent across the facility.

4.3 Installer Qualifications

4.3.1 Switch installation shall be performed by a licensed electrical contractor and journeyman-level electricians experienced in the installation of low-voltage disconnecting means.

5 Environmental and Service Conditions

5.1 A switch and its enclosure shall be suitable for the electrical system, ambient conditions, and physical environment at its point of installation.

5.2 Installation Environment

5.2.1 The installation environment shall determine the required enclosure NEMA 250 type.

Installation Environmentselect

Indoor, dry, climate-controlled

Indoor, damp or uncontrolled (unconditioned mechanical room)

Outdoor, exposed (rain, sleet, snow)

Wet location or washdown (hose-directed water)

Corrosive (coastal salt air, chemical exposure)

Industrial, dust and falling dirt (indoor, dust-tight)

5.2.2 Indoor dry installations may use a NEMA Type 1 enclosure.

5.2.3 Outdoor and damp locations shall use a NEMA Type 3R enclosure as a minimum.

5.2.4 Wet and washdown locations shall use a NEMA Type 4 or Type 4X enclosure.

5.2.5 Corrosive locations shall use a NEMA Type 4X enclosure of stainless steel or nonmetallic construction.

5.2.6 Industrial dust-tight indoor locations may use a NEMA Type 12 enclosure.

NOTE The detailed enclosure requirements for each environment are addressed in the Enclosure section. (5.2.7)

5.3 Ambient Temperature

Ambient Temperature (Maximum)select

40°C (standard rating)

50°C (elevated indoor or mechanical room)

55°C (rooftop or process area, consult manufacturer)

5.3.1 Switches installed in locations with sustained ambient temperatures above 40°C shall be derated or an oversized switch shall be specified per the manufacturer's published derating data.

5.3.2 Rooftop-mounted switches serving air-conditioning equipment routinely see elevated ambient temperatures from solar gain and shall be rated accordingly.

6 Duty Class

NOTE NEMA KS 1 defines two construction classes for enclosed switches, heavy-duty (HD) and general-duty (GD), differing in endurance, voltage rating, fault withstand, and available enclosure types. (6.1)

NOTE Heavy-duty switches are rated to 600V and up to 1200A, accept current-limiting fuses for a high short-circuit current rating, and are available in the full range of enclosure types; general-duty switches are limited to 240V and 600A and to NEMA Type 1 and Type 3R enclosures. (6.2)

6.3 The switch duty class shall be specified for each application, selected to meet the required voltage, ampacity, short-circuit rating, and enclosure type.

Duty Classradio

● Heavy-duty (HD) — to 600V, to 1200A

○ General-duty (GD) — to 240V, to 600A

6.4 Switches applied at 480V or 600V shall be heavy-duty, because general-duty switches are rated only to 240V.

6.5 Switches applied as feeder or service disconnecting means shall be heavy-duty.

6.6 Switches subject to frequent operation, motor switching, or higher fault exposure shall be heavy-duty.

NOTE General-duty switches may be used only on 240V and below circuits with light operating duty and low available fault current, typically small commercial and residential service or branch applications. (6.7)

NOTE Applying a general-duty switch where a heavy-duty switch is required is a frequent and consequential error, because the general-duty switch lacks the voltage rating, fault withstand, and endurance the application demands. (6.8)

7 Switch Function

7.1 Fusible or Non-Fusible

Switch Functionradio

○ Fusible (switch with integral fuse provisions)

● Non-fusible (disconnect only, no overcurrent device)

7.1.1 A fusible switch shall be provided where the switch is required to provide branch or feeder overcurrent protection in addition to disconnection.

7.1.2 A non-fusible switch may be provided where overcurrent protection is supplied by an upstream device and the switch is required only as a disconnecting or isolating means.

7.1.3 A non-fusible switch shall be applied only where the upstream overcurrent device protects the conductors and equipment served by the switch.

7.2 Fuse Provisions

Fuse Class (fusible switches)select

Class R (rejection, RK1 or RK5)

Class J

Class T

Class L (above 600A)

Class H / K (basic, low SCCR)

7.2.1 Fusible switches shall be furnished with fuse clips and rejection features matched to the specified fuse class.

7.2.2 Fusible switches shall use current-limiting fuses of Class R, J, T, or L where a short-circuit current rating above 10kA is required.

7.2.3 Class H and Class K fuses shall not be used where the available fault current exceeds 10kA, because a switch fused with non-current-limiting fuses is rated only 10kA SCCR.

7.2.4 Rejection-style fuse clips shall be provided so that a current-limiting fuse cannot be replaced with a non-current-limiting fuse of a lower class, which would void the marked short-circuit current rating.

NOTE Class R, J, and T fuses are current-limiting and establish a switch SCCR of up to 200kA, while Class H and K fuses are not current-limiting and hold the switch to a 10kA SCCR; the fuse class is therefore a short-circuit decision, not only an overcurrent decision. (7.2.5)

8 Electrical Ratings

8.1 Voltage Rating

System Voltageselect

240V (1Φ or 3Φ)

480V, 3Φ

600V, 3Φ

208Y/120V, 3Φ 4-wire

480Y/277V, 3Φ 4-wire

8.1.1 The switch voltage rating shall equal or exceed the nominal system voltage of the circuit it disconnects.

8.1.2 A general-duty switch shall not be applied above 240V.

8.2 Ampere Rating

Switch Ampere Ratingselect

30 A

60 A

100 A

200 A

400 A

600 A

800 A

1200 A

Per drawings — one-line diagram (deferred by default)

8.2.1 The switch ampere rating shall equal or exceed the continuous load it carries and shall not be less than the rating of the overcurrent device protecting the circuit.

NOTE Enclosed switches are manufactured in the standard ampere frames of 30, 60, 100, 200, 400, 600, 800, and 1200A; the selected switch shall be the standard frame that equals or exceeds the required ampacity. (8.2.2)

8.3 Horsepower Rating

8.3.1 A switch applied as a motor disconnecting means shall be horsepower-rated for the motor it serves, in accordance with NFPA 70 430.109.

8.3.2 The switch horsepower rating at the applied voltage shall equal or exceed the rated horsepower of the motor.

NOTE A horsepower-rated switch is tested to interrupt the locked-rotor current of a motor of that rating; an ampere-only rating does not establish that the switch can safely break motor starting and stalled-rotor currents. (8.3.3)

8.4 Motor Disconnect Sizing

8.4.1 The ampere rating of a switch serving a single motor shall be not less than 115 percent of the motor full-load current, in accordance with NFPA 70 430.110(A).

8.4.2 The full-load current used for disconnect sizing shall be the value from the applicable NFPA 70 motor full-load current table, not the motor nameplate current.

NOTE Undersizing the motor disconnect to the nameplate current rather than to 115 percent of the table full-load current is a common code violation that an inspector will reject. (8.4.3)

8.5 Short-Circuit Current Rating

8.5.1 The short-circuit current rating (SCCR) of the switch, as marked and with the specified fuses installed for a fusible switch, shall equal or exceed the available fault current at its line terminals.

Short-Circuit Current Rating (SCCR)select

10 kAIC (non-current-limiting fuses or non-fusible, default duty)

100 kAIC (Class R, J, or T fuses)

200 kAIC (Class R, J, T, or L current-limiting fuses)

Per drawings — one-line diagram (deferred by default)

8.5.2 The available fault current shall be determined by the project short-circuit study and shall be confirmed for each switch location per Arc Flash StudyArc-Flash Hazard AnalysisResolves to the current edition.sync/arc-flash-study.

8.5.3 A non-fusible switch carries the SCCR established by its tested combination with a specific upstream overcurrent device, and that combination shall be verified for the available fault current at the switch.

NOTE A fusible switch with current-limiting Class R, J, or T fuses achieves an SCCR of up to 200kA, which is the principal reason a fusible switch is selected at locations with high available fault current. (8.5.4)

NOTE An SCCR below the available fault current allows the switch to fail destructively during a fault rather than safely interrupting or withstanding it, and is both a code violation and a safety hazard. (8.5.5)

8.6 Series Rating

8.6.1 Where a non-fusible or fusible switch relies on a tested series combination with an upstream overcurrent device to achieve its SCCR, the combination shall be a laboratory-tested and listed series combination per NFPA 70 240.86.

8.6.2 Where a series combination is relied upon, the switch enclosure shall be field-marked to identify the series-rated combination and the required upstream device, in accordance with NFPA 70 110.22.

NOTE Substituting an upstream device that is not part of the tested series combination breaks the series rating and renders the installation noncompliant. (8.6.3)

9 Poles and Neutral

9.1 Number of Poles

Number of Switched Polesradio

○ 2-pole (1Φ, or 2-wire)

● 3-pole (3Φ, 3-wire)

○ 4-pole (3Φ with switched neutral)

○ 6-pole (double-throw or special)

9.1.1 The number of switched poles shall match the number of ungrounded conductors to be disconnected.

9.1.2 A switch used as a disconnecting means shall simultaneously open all ungrounded conductors of the circuit, in accordance with NFPA 70 404.

9.2 Neutral Arrangement

Neutral Arrangementradio

● Solid neutral (bonded-through, not switched)

○ Switched neutral (4th switched pole)

○ No neutral (3-wire system)

9.2.1 A solid neutral assembly shall be provided where the system includes a grounded neutral conductor that is carried through the switch but not switched.

9.2.2 A switched neutral (fourth switched pole) shall be provided where the neutral must be opened together with the ungrounded conductors, such as where the switch isolates a separately derived system or where required by the equipment served.

9.2.3 Switching the neutral of a system that is bonded both upstream and downstream of the switch creates objectionable neutral current paths; the neutral shall be switched only where the application requires it.

9.3 Service-Entrance Rating

Service-Entrance Ratingradio

● Not service entrance (feeder or equipment disconnect)

○ Service-entrance rated (with neutral bonding and grounding kit)

9.3.1 Where the switch serves as service disconnecting means, it shall be listed and labeled for use as service-entrance equipment per UL 98 and shall comply with NFPA 70 Article 230.

9.3.2 A service-entrance-rated switch shall include a means to bond the grounded service conductor to the enclosure and an equipment grounding terminal, in accordance with NFPA 70 250.

NOTE The neutral bonding jumper of a service-entrance switch establishes the main bonding connection for the service; its omission leaves the service ungrounded and is a serious safety defect. (9.3.3)

9.3.4 The Contractor shall coordinate the service neutral bond and grounding electrode connection at a service-entrance switch with Grounding And BondingGrounding and Bonding for Electrical SystemsResolves to the current edition.sync/grounding-and-bonding.

10 Construction and Components

10.1 Enclosure

Enclosure NEMA Typeselect

NEMA Type 1 (indoor, general purpose)

NEMA Type 3R (outdoor, rainproof)

NEMA Type 4 (watertight, indoor or outdoor)

NEMA Type 4X stainless steel (watertight, corrosion-resistant)

NEMA Type 4X nonmetallic (watertight, corrosion-resistant)

NEMA Type 12 (indoor, dust-tight)

10.1.1 The enclosure shall be listed to UL 50 and, for environmental types, UL 50E, and shall match the NEMA 250 type required by the installation environment.

10.1.2 The enclosure NEMA type shall be consistent with the installation environment selected in the Environmental and Service Conditions section.

NOTE A NEMA Type 3R enclosure protects against falling rain, sleet, and ice but is not watertight; washdown and hose-directed-water locations require Type 4 or Type 4X. (10.1.3)

NOTE A NEMA Type 4X enclosure of Type 304 or Type 316 stainless steel, or of nonmetallic construction, shall be provided in coastal, food-processing, and chemical-exposure environments where a painted steel enclosure would corrode. (10.1.4)

10.1.5 Where the switch is mounted outdoors, conduit shall enter from the bottom or be provided with listed rain-tight hubs where it enters from the top, to prevent water migration into the enclosure.

10.2 Operating Mechanism and Visible Blade

10.2.1 The switch shall be operated by an external handle that indicates the ON and OFF position of the switch blades.

10.2.2 The switch shall provide visible blade construction so that the open position of the blades can be confirmed by direct observation, where available for the ampere rating.

NOTE Visible-blade construction is commonly available through 400A and provides positive visual confirmation that the circuit is open before work begins; above 400A the open position is confirmed by the handle position indicator. (10.2.3)

10.2.4 The operating handle shall be lockable in the OFF position to accept at least one padlock for lockout/tagout.

10.3 Door Interlock

Door Interlockradio

● Defeatable (interlock can be bypassed by qualified person)

○ Non-defeatable (door cannot open with switch ON)

10.3.1 The switch shall include a door interlock that prevents the enclosure door from opening while the switch is in the ON position.

10.3.2 A defeatable interlock shall require a deliberate action by a qualified person to bypass and shall re-engage automatically when the door is closed.

NOTE A defeatable interlock allows a qualified person to open the door for inspection with the switch energized, while a non-defeatable interlock enforces de-energization before access and is preferred where unqualified persons may operate the equipment. (10.3.3)

10.4 Lockout/Tagout Provisions

10.4.1 The switch shall provide provisions for lockout/tagout in the OFF position in accordance with OSHA 29 CFR 1910.147.

10.4.2 The lockout provision shall accept the number of padlocks required by the facility's energy-control program, with multiple-lock hasps provided where more than one worker must lock out the switch.

10.4.3 A line-side barrier or shield shall be provided where required so that the line terminals remain guarded when the door is open and the switch is OFF.

11 HVAC and Equipment Disconnects

NOTE A disconnecting means shall be installed within sight from, and readily accessible from, air-conditioning and refrigerating equipment, in accordance with NFPA 70 440.14. (11.1)

11.2 The disconnect serving air-conditioning or refrigerating equipment shall not be mounted on a panel of the equipment that must be removed to service the equipment, per NFPA 70 440.14.

11.3 The disconnect serving air-conditioning or refrigerating equipment shall meet the working space requirements of NFPA 70 110.26(A).

HVAC / Equipment Disconnect Typeradio

● Non-fusible (overcurrent protection at upstream panel)

○ Fusible (overcurrent protection at the disconnect)

11.4 The disconnect type for air-conditioning and refrigerating equipment shall be selected according to the equipment nameplate, which states whether fuses are required at the disconnect.

NOTE A rooftop equipment disconnect shall be provided in a NEMA Type 3R enclosure as a minimum, and in a Type 4X enclosure in coastal or corrosive environments. (11.5)

12 Installation

12.1 Location and Mounting

12.1.1 Switch location and arrangement shall be as indicated on the equipment plans.

12.1.2 Switches shall be mounted plumb, level, and secured to structural backing or to the equipment they serve.

12.1.3 A disconnecting means shall be located so that it is readily accessible and within sight of the equipment it controls where the applicable NFPA 70 article requires it.

12.1.4 The operating handle, at its highest position, shall be not more than 6 ft 7 in. above the floor or working platform, in accordance with NFPA 70 404.8(A).

12.2 Working Space

12.2.1 Minimum working space shall be maintained in front of each switch in accordance with NFPA 70 110.26.

12.2.2 Working clearance shall be measured from the front of the enclosure or the front of any live parts, whichever is greater, to the nearest obstruction.

12.2.3 Working space in front of a disconnecting means shall not be used for storage.

12.3 Conductor Terminations

12.3.1 Line and load conductors shall be terminated in the switch lugs in accordance with Conductors And CablesConductors and CablesResolves to the current edition.sync/conductors-and-cables and the switch manufacturer's instructions.

12.3.2 Line conductors shall be connected to the line terminals and load conductors to the load terminals, so that the line side is de-energized only by the upstream device and the load side is de-energized by the switch.

12.3.3 All conductor terminations shall be torqued to the manufacturer's published torque values using a calibrated torque wrench.

12.3.4 Termination torque values shall be recorded as part of the field test documentation.

12.3.5 Aluminum conductors shall be terminated only in lugs listed for aluminum and prepared per the lug manufacturer's instructions.

12.4 Fuse Installation

12.4.1 Fuses shall be installed in fusible switches only after the switch is verified de-energized and the conductors terminated.

12.4.2 The installed fuse class and ampere rating shall match the fuse class on which the switch SCCR and the circuit overcurrent protection were based.

12.4.3 A label identifying the required fuse class and maximum ampere rating shall be applied to or within each fusible switch.

13 Testing

13.1 Factory Tests

13.1.1 Each switch shall be production-tested by the manufacturer in accordance with UL 98 prior to shipment.

13.1.2 The Contractor shall furnish the manufacturer's certification that each switch passed its production tests on request.

13.2 Field Tests

13.2.1 After installation and before energization, the Contractor shall perform a visual and mechanical inspection of each switch, including verification of ratings, enclosure type, interlock operation, and termination torque.

13.2.2 The Contractor shall operate each switch through at least one open-close cycle to verify free mechanical operation and correct handle indication.

13.2.3 The Contractor shall perform an insulation-resistance test on each pole of switches 400A and larger, phase-to-phase and phase-to-ground, in accordance with NETA ATS.

Field Test Scopecheckbox

☑ Visual and mechanical inspection (ratings, enclosure, interlock)

☑ Operational test (open-close cycle, handle indication)

☑ Termination torque verification

☐ Insulation-resistance test (400A and larger)

13.2.4 The Contractor shall correct any switch that fails inspection or test and shall re-verify.

14 Identification and Labeling

14.1 Each switch shall be labeled to identify its tag, the equipment or circuit it serves, and the source of its supply, in accordance with Equipment LabelingElectrical Equipment LabelingResolves to the current edition.sync/equipment-labeling.

14.2 Each switch shall receive an arc-flash warning label in accordance with NFPA 70E prior to energization.

14.3 Where a fusible switch's fuse class is critical to its short-circuit rating, the required fuse class and maximum ampere rating shall be marked at the switch.

14.4 Where a series-rated combination is relied upon, the switch shall be field-marked to identify the series combination and the required upstream device per NFPA 70 110.22.

15 Delivery, Storage, and Handling

15.1 Switches shall be delivered in the manufacturer's original packaging with listing marks and ratings intact.

15.2 Switches shall be stored indoors in a clean, dry location and protected from moisture, corrosive atmospheres, and physical damage until installed.

15.3 Switches shall be inspected for damage on delivery, and any damage shall be documented and reported before installation.

15.4 A switch whose enclosure, operating mechanism, or interlock shows evidence of impact or moisture intrusion shall not be installed.

16 Warranty

Warranty Periodselect

1 year from substantial completion

2 years from substantial completion

5 years from substantial completion

16.1 Switches shall be warranted by the manufacturer against defects in materials and workmanship for the specified period.

16.2 The warranty period shall begin at the date of substantial completion, not the date of shipment or installation.

16.3 The Contractor shall warrant the installation, including terminations, interlock operation, and correct fuse selection, for the project warranty period.

17 Spare Parts

Spare Fuses (fusible switches)radio

○ None

● Three spare fuses of each class and rating installed

○ One spare set per fusible switch

17.1 Where fusible switches are installed, the Contractor shall provide spare fuses of the same class and ampere rating as those installed.

17.2 Spare fuses shall be stored in the electrical room in their original packaging and identified with the switch tag and rating they serve.

NOTE Stocking spare fuses allows a cleared fuse to be replaced promptly, restoring the disconnect to service without waiting on procurement. (17.3)