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Suggested Wiring Procedures of an Underground Temporary Service Pole (NEC 2002)

By Warren Goodrich
Suggested Wiring Procedures of an Underground Temporary Service Pole (NEC 2002)

Underground Temporary: Receptacle Style and Type

All 125 volt rated receptacles rated in amps 15, 20, or 30 that are installed on a temporary service pole or installed for use as temporary wiring must be GFCI protected. NEC Article 527.6.A If all 125 volt receptacles installed on the temporary or installed for use as temporary wiring are on the same branch circuit, the GFCI protective device installed as the first receptacle on that circuit may protect be used as the GFCI protective device serving all other receptacles on that circuit attached to the load side of that GFCI protective device. The GFCI receptacle on each circuit must be the lead receptacle with the other normal receptacles on that same branch circuit are then GFI protected by that one GFCI protective device installed as the first receptacle on that certain branch circuit. You may use a GFCI breaker serving each certain circuit and also serving as the overcurrent device instead of the use of a GFCI receptacle style protective device if you wish. Any direct connect circuit {connectors & wire nut style connection} is allowed not to be GFCI protected, unless a receptacle appears on that certain branch circuit. Then a GFCI protective device must appear when that receptacle appears. NEC Article 527.6.A.

You may view a close up of a weatherproof GFI receptacle installation by clicking on the picture icon to the left.

If the branch circuit is direct connected, at the end of line, without any receptacle installed on that certain branch circuit, then no GFCI protective device is required. Code mute

Any other type receptacle other than 125 volt 15, 20, 30 amp receptacles, no matter what amp or voltage rating, must also be GFCI protected or you must have documented, and recorded records showing the tests were done before initial use and every 3 months thereafter. These records must be presented to the Electrical Inspector upon his or her request. NEC Article 527.6.B The requirements of other receptacles stated in NEC Article 527.6.B includes 40 and 50 amp receptacles or even 220 volt receptacles if not part of a permanent wiring system of a permanent structure.

Receptacle Box: Style and Type

All boxes on an underground temporary service pole will be considered exposed to a wet location. See definitions in NEC Article 100 Therefore all boxes, fittings, and covers must be listed and labeled as being weatherproof if surface mounted. NEC Article 312.2.A and NEC Article 314.15.A The receptacles on the temporary must have a weathershield mounted over the box. NEC Article 406.8 This weather shield will look like a plastic cover you would find over a thermostat in a motel hallway, except the weathershield must be listed and labeled as being weatherproof and approved for the purpose. This weathershield might be clear or opaque.

Example of Weatherproof Device Bos

To view an example of a weatherproof device box and a weather shield try clicking on the picture icon to the left.

If the box is metal, you must bond the metal box to the grounding conductor. NEC Article 250.110 The bonding method may be accomplished by installing a green ground screw NEC Article 250.126 secured to a threaded hole in the back of the box. The bonding method of a receptacle to a surface mounted metal box may be accomplished by installing a non self grounding receptacle style as the grounding contact between the yoke of the normal duplex receptacle NEC Article 250.146.A and the metal box. If the box is not in direct contact with that metal box this grounding method must not be used. A recessed box may also use the mounting yoke but only if the receptacle is a listed and labeled as a self grounding receptacle NEC Article 250.126.B using the spring clip of a self grounding receptacle included on the mounting yoke. The previous rules applies if the box is with equipment grounding such as the box connected by an equipment grounding conductor to a green grounding screw NEC Article 250.126 or a metal conduit being used as an equipment grounding conductor bonding the metal box. NEC Article 250.118

You can identify a self-grounding receptacle by the spring clip mounted at the yoke, to insure an adequate contact to the box. NEC Article 250.146.B This type of self-grounding receptacle is commonly used on metal conduit wiring style often found on commercial project where no grounding conductor is ran, but instead this wiring style is using the conduit as the grounding path. NEC Article 250.118 The boxes must be securely mounted to the structure of the temporary. NEC Article 300.11.A

Pole Dimensions/Style/Type/Depth Requirements

The following requirements will not be found in the NEC, but these requirements will most likely be required by either the Utility Company rules, or the Authority Having Jurisdiction. The Authority Having Jurisdiction will use the NEC articles referring to the requirement that any permanent wiring style must be substantially mounted to a permanently installed structure. NEC Article 300.11.A You will find in the Chapter for temporary wiring that any electrical service is not considered as temporary but must be referred to NEC Article 230 for permanent service installations. NEC Article 527.4.A

In order to meet the minimum safety standards concerning wiring a permanent service try the following link to our web site titled “Wiring a Service

An underground temporary service is considered by the NEC to be a normal permanently installed electrical service, mounted on a pole. No less is required of an underground temporary pole service than a normal permanently installed main service only most often a temporary is built smaller in amp rating and required to be weatherproof. Normally this temporary underground service will be shorter than an overhead temporary with the meter base placed around three feet high due to a Utility Company exception allowing the lower meter base for underground temporary pole services.

If you are installing an overhead temporary instead of an underground temporary you should be reading the article written to help you with an overhead temporary service. To see the article concerning an overhead temporary service please use the following link; "Overhead Temporary"

Underground Temporary Service

If you are truly building an underground temporary service continue reading this article to help you build an underground temporary service.

The pole on an underground temporary pole service should be a minimum of 3 1/2" thick. The total length requirement, generally is, approximately 10’long. The burial depth of an underground temporary pole should be around 2’6”deep.

Special Note: Braces are not required for an underground temporary pole service due to the fact that it does not support any over head wires but is feed underground and placed by an underground transformer or an overhead transformer with conduit coming down that Utility pole into the ground then to the underground temporary pole service.

Explanation: Click on Picture Icon for Full Size Picture Explanation

If you put 2’6”of post in the earth, run your down pipe up the post to set your meter base at 3’{to center}, above finish grade, then, mount your disconnect, or panel above the meter base taking up approximately 1’6”, and then, mount your receptacle box [or boxes] above the disconnect [service panel] taking up approximately 17”above that, you have used up approximately 8’5”of a 10’pole. This leaves your pole approximately 7’6”above the finish grade and a total of 1’6”of unused pole left over, to install 240 volt receptacles etc., if needed. A 10’pole usually works out to "what is needed" for this design of underground temporary.

A commonly used temporary that has the meter base and panel manufactured as one unit would have all the above made into one unit pre-built. I have no intention of trying to promote either types of underground temporary services whether a combined unit or pieced together by the installer. I have seen both in the field and find not fault with either method. The decision of which you use is yours.

Nipple Style and Type (Between Disconnect and Receptacles)

When you come out of the top of the disconnect or panel, you will find your bossed [treaded] receptacle box conduit hole, or your PVC receptacle box’s conduit hole laying offset from the hole at the top of your disconnect or panel box. You can usually resolve this offset condition where the holes don’t line up, by twisting the offset weather proof hub of the weather proof disconnect or panel box. You will have to size the weather proof hub of the disconnect or panel box equal to the size of the nipple installed between the disconnect hub or panel and the receptacle box. The minimum size nipple, for a total number of conductors of three to nine 14 awg or three to nine 12 awg THWN conductors, which should be an adequate number for most applications from panel to receptacle paths, is 1/2". NEC Chapter 9, Table 1, Note 4. You may use a nipple in order to meet your receptacle box bossed [threaded] hub out to your panel box weather proof hub coming out of the top of the disconnect or panel box. The minimum size wire to your receptacles, through your nipple, from your over-current device [breaker or fuse], is 14 awg using a 15 amp maximum size overcurrent device. NEC Table 240.4.D The maximum size wire to your receptacles, through your nipple, from your overcurrent device [breaker or fuse], is 12 awg using a 20 amp maximum size overcurrent device. NEC Article 240.4.D and NEC 110.3.B [listing and labeling requirements.] The maximum wire size to a duplex receptacle is 12 awg on a 15 or 20 amp receptacle device. NEC Article 210.21.B.2 A 15 amp receptacle is allowed to serve a 14 awg -15 amp circuit and / or a 12 awg -20 amp branch circuit. NEC Article 210.21.B.2 Any form of receptacle must be and weather proof NEC Article 314.15.A. Any form of receptacle exposed to the weather must be with a weather shield. NEC Article 406.8.

An example of another weatherproof GFI protected receptacle with a bubble shield may be viewed by clicking on the picture icon to the left.

Any receptacle must be GFCI protected if on a temporary service pole. If a 220 volt rated receptacle or receptacles rated more than 30 amp is not GFI protected as allowed by the NEC then that receptacle must be recorded on documented records and made available to the electrical inspector upon request. NEC Article 527.6.A & B

An example of a 220 volt receptacle that must be GFI protected or provided with documented records of its use may be viewed by clicking on the picture icon to the left. Although this picture does not portray an underground installation you may see what the 220 volt receptacle may look like that is either protected by a GFI breaker or not GFI protected with the required records being available as mentioned;

Conductors Serving Receptacles

The conductors serving outside receptacles exposed to physical damage must be protected by the proper minimum nipple size required according to the size of the conductor being protected and the type of nipple being used.

Please keep in mind that any conductor 4 awg or larger must be protected with plastic bushings on the ends of the conduits. PVC is not exempt from the plastic bushing requirement for conductors 4 awg or larger. NEC Article 300.4.F

An example of a plastic bushing installed as required for 4 awg or larger conductors in a conduit may be viewed by clicking on the picture icon to the left.

 

Disconnects/Size/Styles/Types/Minimum Sizes Per Circuits

Your overcurrent device [breaker box or fuse box] can be of an array of sizes, each size creating new requirements. I will attempt to approach the majority of your choices.

You must ensure that whichever panel you use to install as a panel used on a temporary service pole is a service rated panel. Some panels are not approved as a service rated panel but only allowed to be used as a non service rated panel [sub panel]. When building a service you must use a service rated panel that is listed and labeled as a service rated panel. When wiring a service rated panel the neutral bar and the grounding bar must be married together as well as containing a main bonding jumper to the metal of the main service rated panel or disconnect box.

To view an example of the inside wiring of a weatherproof main service rated panel or disconnect showing the neutrals and grounding conductor married together you may view by clicking on the picture icon to the left.

If you use a type service panel limiting only one circuit in the box, you may use a minimum rating of 15 amps, weatherproof service rated panel. NEC Article 230.79.A

If you use a type service panel with only two circuits in the box, you must use a minimum rating of 30 amps, weatherproof service rated panel. NEC Article 230.79.B

If you use a type service panel with more than two [three or more] circuits in the box, you must use a minimum rating of 60 amps, weatherproof service rated panel. NEC Article 230.79.D

Example of Weatherproof Two Circuit Panel

An example of a weatherproof two circuit panel may be viewed by clicking on the picture icon to the left.

You must use a service rated panel equal to or larger than the demand load calculated for your project as required by NEC Article 220 and NEC Article 230.79

Main Service Rated Panels

It is allowed that if you have six or less [breakers or disconnects] {that are grouped}, a main disconnect, and / or, breaker is not required. NEC Article 230.71.A The number of breakers counted as main disconnects must not exceed 6 sweeps of the hand. The six maximum number of breakers may be either single pole or double pole breakers as long as it only takes six sweeps of the hand to shut off all the main disconnect forms. NEC Article 230.71.B

An example of a 200 amp main service rated panel that is using the six disconnect rule may be viewed by clicking on the picture icon to the left.

 

 

A second style of main service rated panel 100 amp main service rated panel using the six disconnect rule may be viewed by clicking on the picture icon to the left.

 

Please keep in mind, that if you use a single main overcurrent device smaller than the maximum rating of your service panel, you may reduce the feeder size to equal your main overcurrent device maximum rating, but you must provide ampacity of that service conductor equal to the maximum demand load of the equipment to be used. NEC Article 220 and NEC Article 230.79

Please keep in mind, that although you are working with a "temporary", NEC Article 230 must still apply as a permanent service, and be treated as such. When it comes to services connecting to utility company point of connection there is no temporary wiring concerning that service until you are on the load side of that service panel after the branch circuit fuses or breakers.

Please keep in mind that any equipment being utilized as a service panel must be service rated as listed and labeled on that service rated panel’s label.

Nipple/Style/Type (Between Meter and Disconnect)

Your nipple between the service panel, and the meterbase, must be sized by the service conductor size using the 60% fill allowed concerning conduit fill.

If your service panel main over-current device size is 15 amps with only one circuit available in the disconnect or panel box, you may use a feeder rated no less than a 15 amp rated conductor, from the transformer, through to the main lugs of the service panel, or the lug of your main over-current device depending on the service rated panel style that you plan to use. You may use 14 awg copper UF Cable or conduit and THWN between the transformer and meter base. You may use 14 awg copper THWN between the meter base and the main service rated panel NEC Article 240.4.D The conduit minimum size for 14 awg would be ½”conduit no matter the type of conduit. NEC Appendix C

If your service panel main over-current device size is 30 amps with only two circuits available in your main service disconnect box, you may use a feeder rated no less than a 30 amp rated conductor, from the transformer, through to the main lugs of the service panel, or the lug of your main over-current device depending on the service rated panel style that you plan to use. You may use 10 awg copper UF cable or if in conduit THWN between the transformer and the meter base. You may use 10 awg copper THWN between the meter base and the main service rated panel NEC Article 240.4.D The conduit minimum size for 10 awg would be ½”conduit no matter the type of conduit. NEC Appendix C

If your service panel main over-current device size is more than two circuits and 60 amp rated, you must use a feeder rated no less than a 60 amp rated conductor, from the transformer, through to the main lugs of the service panel, or the lug of your main over-current device depending on the service rated panel style that you plan to use. You may use 6 awg copper USE or UF or if in conduit THWN between the transformer and the meter base. You may use 6 awg copper THWN between the meter base and the main service rated panel NEC Table 310.16 and NEC Article 110.14.C.1.A The conduit minimum size for 6 awg would be ¾”conduit no matter the type of conduit. NEC Appendix C

Service Panel Main Over-Current Device

If your service panel main over-current device size is 100 amps in a residential setting, you must use a feeder rated no less than a 100 amp rated conductor, from the transformer, through to the main lugs of the service panel, or the lug of your main over-current device depending on the service rated panel style that you plan to use. You may use 4 awg copper USE Cable or if in conduit THWN between the transformer and the meter base You may use 4 awg copper THWN between the meter base and the main service rated panel NEC Table 310.15.B.6 The conduit minimum size for 4 awg would be 1”EMT conduit NEC Appendix C 1”or 1 ¼”Schedule 40 PVC conduit NEC Appendix C 10 or 1 ¼”Schedule 80 PVC conduit. NEC Appendix C 9.

You must use the 60 degree column found in NEC Table 310.16 to decide the ampacity of your conductors if that conductor is smaller than 1 awg and larger than a 10 awg conductor NEC Article 240.3.D 10 awg or smaller conductors. You must use the 75 degree column found in NEC Table 310.16 to decide the ampacity of your conductors if that conductor is larger than 1 awg. This is true regardless of the temperature rating of the insulation of that conductor. NEC Article 110.14.C

The conduit size must be sized meeting the requirements of NEC Appendix C using the conduit type you plan to use compared to the conductor size and type of insulation on those conductors.

Meterbase/Supplier/Requirements

Some Utility companies will furnish that meter base for your temporary. Some Utility companies require you to furnish your meter base. Some temporary panels such as the Midwest panel is manufactured with the panel and disconnect as one unit built together. You really should call your local Inspector and your local Utility company to confirm what rules apply in your area concerning that meter base. Also check with your Utility company and your local Inspector concerning any special local rules applying to temporary services. Some Utility companies will even furnish the entire temporary and electricity for one set fee as a complete unit installed by the Utility Company at a monthly rate. This is where you really should make those two contacts both the AHJ [local Electrical Inspector] and your serving Utility Company for specialized local rules.

An example of an underground meter base showing line [power into meter base] and load [power out of meter base to your panel] may be viewed aby clicking on the picture icon to the left.

Straps/Where Required

You must support the pipe with straps. The NEC states that you must install a strap near each end of the conduit. Check the support requirements of the style and type of conduits you are using. Keep in mind that if the conduit is installed below the height of the meterbase chances are that conduit will be considered as subject to physical damage requiring heavy wall conduit approved for use where subject to physical damage. Please confirm that the conduits being installed below approximately 6’are approved where subject to physical damage.

Feeder/Style/Type/Size

If you are using this temporary on a residential application, you may size your feeders by NEC Table 310.15.B.6 allowing a reduction in size from that required for commercial use. If you are using this temporary on a non-residential unit you must size your feeder by NEC Table 310.16

Special Note: Keep in mind that the chart in NEC Article 310.16 must be adapted to meet the requirements of NEC Article 110.14.C. If the conductor required is smaller than a 1 AWG. but larger than a 10 awg conductor then the temperature rating of the conductor as per the ampacity in NEC Table 310.16 must be limited to 60 degree centigrade [such as the column for TW conductors] regardless if the conductor is rated 75 or 90 degree such as THHN Conductors. If the conductors are used as a feeder for a residential setting then you may disregard the temperature limitations and use the NEC Table 310.15.B.6 exclusively with no temperature rating in your concerns. This use of NEC Table 310.15.B.6 may be controversial when used on a residential setting yet on a temporary. Please contact you local AHJ [Electrical Inspector] to confirm that you are allowed to use this table in your local area.

In this application you must use a conductor approved for a wet location if contained in a conduit underground or approved for direct burial if installed without conduit protection and then only if not subject to physical damage, and approved as a service conductor [with a "W" if wet classification or a “U”if direct burial in it's identification and sunlight resistant] NEC Article 310.8.D Please leave approximately 10’of loose tail on this service conductor allowing enough conductor length that the Power Company may have enough to work with during their connection inside there ground pot style Utility transformer. Please identify the neutral with either a white or gray identifying means. NEC Article 200.6.A and B

The following feeders are accepted practice to use in this application to

serve as an underground service entrance conductor serving an

underground temporary, but this list does not name all

conductors approved for this application.

Direct Burial Copper Feeder Cables or Conductors

15 amp rated = 14/3wGrnd UF cable with a black and white insulated conductor NEC Article 240.4.D

30 amp rated = 10/3wGrnd UF cable with a black, red, and white insulated conductor NEC Article 240.4.D

60 amp rated = 6/3wGrnd UF or USE cable with a black, red, and white insulated conductor NEC Table 310/16

100 amp rated = 4 awg. USE cable with a black, red and white insulated conductor {residential} NEC Table 310.15.B.6

200 amp rated = 2/0 awg. USE cable {residential} NEC Table 310.15.B.6

Direct Burial Aluminum Feeder Cables or Conductors

15 amp rated = 12/3wGrnd UF cable with a black and white insulated conductor NEC Article 240.4.D

30 amp rated = 8/3wGrnd UF or USE cable with a black, red, and white insulated conductor NEC Table 310.16

60 amp rated = 4 awg URD or USE cable with two black, black with a yellow stripe insulated conductor NEC Table 310/16

100 amp rated = 2 awg. URD or USE cable with two black and a black with a yellow stripe {residential} NEC Table 310.15.B.6

200 amp rated = 4/0 awg. URD OR USE cable with two black and a black with yellow stripe {residential} NEC Table 310.15.B.6

Copper Feeder Conductors in a Conduit, the Full Length of the Feeder Conductor

15 amp rated contained within a ½”conduit NEC Appendix C = 14 awg THWN / OR / THW / OR / XHHW NEC Article 240.3.D

30 amp rated contained within a ½”conduit NEC Appendix C = 10 awg. THWN / OR / THW / OR / XHHW NEC Article 240.3.D

60 amp rated contained within a ¾”conduit NEC Appendix C = 6 awg. THWN / OR / THW / OR XHHW NEC Table 310/16

100 amp rated contained within a 1”conduit NEC Appendix C = 4 awg. THWN / OR / THW / OR XHHW {residential} NEC Table 310.15.B.6

200 amp rated contained within a 1 ½”conduit NEC Appendix C = 2/0 awg. THWN / OR / THW / OR XHHW {residential} NEC Table 310.15.B.6

Aluminum Feeder Conductors In A Conduit The Full Length Of The Feeder Conductor

15 amp rated contained within a ½”conduit NEC Appendix C = 12 awg THWN / OR / THW / OR / XHHW NEC Article 240.3.D

30 amp rated contained within a ½”EMT or schedule 40 PVC conduit NEC Appendix C1 and NEC Appendix C10 or contained within a ¾”schedule 80 PVC conduit NEC Appendix C9 = 8 awg. THWN / OR / THW / OR / XHHW NEC Table 310.16

60 amp rated contained within a 1”conduit NEC Appendix C = 4 awg. THWN / OR / THW / OR XHHW NEC Table 310/16 and NEC Article 240.4.B

100 amp rated contained within a 1”EMT or schedule 40 PVC conduit NEC Appendix C1 and C10 or contained within a 1 ¼”schedule 80 PVC NEC Appendix C9 = 2 awg. THWN / OR / THW / OR XHHW {residential} NEC Table 310.15.B.6

200 amp rated contained within a 2”conduit NEC Appendix C = 4/0 awg. THWN / OR / THW / OR XHHW {residential} NEC Table 310.15.B.6

Special Note; If you are using aluminum wiring you must use anti-oxidation inhibitor [Nolox] at each connection of that aluminum conductor.

Down Pipe From Meter Base To Earth/Type/Style

Accepted practice will lead you to Sch 80 PVC due to a cost factor which is approved subject to physical damage. Depending on your Electrical Inspector “Authority Having Jurisdiction’s”ruling in your jurisdiction, you may be able to use seal tight flexible conduit as your down pipe between the Utility Company’s transformer and your meter base. The ruling that AHJ makes will depend on your locality of your construction project. If you are in the country where garden tractors and bush hogs are used for mowing then the sch 80 PVC will most likely be your AHJ’s ruling as required to serve as your down pipe. If you are in an incorporated town where push mowers are used for mowing then the seal tight conduit may be approved as allowed to serve as you down pipe between your Utility transformer and your meter base. You may opt to install direct buried conductors or cables that are approved without a conduit when buried. If you plan to use direct buried conductors or cables then your conduit would only have to be installed to 18”below earth and end the conduit allowing the protected cables to be direct buried from there. If you opt to install direct buried conductors or cables often times you will be asked to coil your direct burial cables at the base of your temporary pole then the Utility company may want to install the buried cables to the transformer to ensure your safety concerning high voltage underground conductors around the transformer that you may hit while digging. You should contact your Electrical Inspector and your serving Utility Company to confirm procedures and have the Utility Company place a flag where they want you to install your underground temporary pole.

Transformer

Your Utility Company will flag the area at your request as to where they plan to set their transformer and provide the maximum or minimum distance allowed for your underground temporary service pole to be placed from their transformer. Your Utility Company will furnish your transformer for you.

Grounding Requirements

You must drive a 1/2" x 8' minimum size made grounding electrode [Ground rod] at your temporary. NEC Article 250.52.A.5.B

You must then run the grounding electrode conductor up the pole to the service panel. NEC Article 250.64

You must not use an aluminum grounding electrode in direct contact with the earth. NEC Article 250.64

Absolute minimum grounding electrode conductor size is a # 8 copper for 100 amp or less and # 6 copper for more than 100 amp. NEC Article 250.66

Grounding service conductor sizes between a ground rod and a service panel are as follows;

30 amp feeder = # 8 copper grounding electrode conductor NEC Article 250.66

60 amp feeder = # 8 copper grounding electrode conductor NEC Article 250.66

100 amp feeder = # 8 copper grounding electrode conductor NEC Article 250.66

Special note; If installing a grounding electrode conductor to a made electrode the maximum grounding electrode conductor size required is a 6 awg copper conductor NEC Article 250.66.A

200 amp feeder = # 6 copper grounding electrode conductor to a made electrode. [ground rod] NEC Article 250.66.A

General Info on Temporary Approved Length of Time to be Used

The maximum allowable time for any type of temporary wiring are as follows; 90 DAYS on non construction type projects. NEC Article 527.3.A and B

LIFE OF CONSTRUCTION PROJECT where on a construction site as long as construction process is an active construction project. NEC Article 527.3.A and B

Special Note: The temporary wiring style running from the temporary on the load side of the overcurrent device is rather forgiving on a temporary wiring condition. You must show that the temporary wiring is under a controlled supervision. [ NOT AS SERVICE EQUIPMENT BUT ON THE LOAD SIDE OF AN OVERCURRENT DEVICE] NEC Article 527.3.A and B

Special Note: Pole braces are not required on an underground temporary service pole.

One last look at an overview example of an underground temporary may be viewed by clicking on the picture icon to the left.

This document is based on the 2002 national electrical code and is designed to give you an option, as a self - help, that should pass minimum code requirements. While extensive research has been implemented in the preparation of this self - help document, the author and / or provider of this document assumes no responsibility for errors or omissions, nor is any liability assumed from the use of the information contained within this document by the author or provider.

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