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OSHA list of top 10 most cited safety violations for Need expert advice on the National Electrical Code? Try EC&M’s CodeWatch. Electrical Construction Maintenance Contact Us Page.

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Service Entrance Definitions Service point. Service-Entrance Conductors A service drop or lateral can supply only one set of service-entrance conductors, with three exceptions magazinf If we mixed service conductors with other conductors in the same raceway, a fault that occurred between the service and feeder conductors could bypass the overcurrent protection for the feeder conductors.

Raceways for overhead service drops You cannot connect emergency standby power ahead of service equipment Figure Do you have maggazine question?

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Unfortunately, this is often a “missing step” in the design process. You cannot connect equipment to the supply side of the service disconnect enclosure, except for the seven categories identified in Remember that service conductors originate at the utility service point and terminate on the line side of the service disconnecting means service equipment.

Once you’ve established whether service conductors are inside or outside a structure, do you need to install separate raceways for them? Ideal applications include pumps, fans, compressors, centrifuges, conveyors, mixers, pump jacks, and crushers.


A service drop or lateral can supply only one set of service-entrance conductors, with three exceptions Ensure they comply with the clearance requirements of Getting it right To properly apply the installation requirements for service conductors and equipment, you must first define where your service entrance starts and ends. Size protection devices no smaller than percent of the continuous load. Ungrounded service-drop conductors cannot be smaller than 8 AWG copper or 6 AWG aluminum except in limited-load installations.

Register to view our materials and keep informed with our latest updates. When are they “outside” as opposed to “inside? And you apply different rules, depending on whether a service conductor is inside or outside a structure.

Install the service disconnect at a readily accessible location outside the structure, or inside near the point of entry of the service conductors.

Locate the service head above the point of attachment or within 2ft of the point of attachment if this isn’t practical. We use cookies to support this website, track usage on this website, to perform amgazine and to perform promotional activities. Service conductors are “outside” magazinf they are installed: You are limited to six disconnects for each service permitted by Click here to accept cookies. The conductors from the service point to the service disconnecting means service equipment, not meter.

Service Equipment You must supply the service disconnect with a main bonding jumper [ Select a category, choose a Product Family, then select from the list of available documents.


Ensure this point is conducive to maintaining the minimum service conductor clearance required by Please enable mwgazine in your browser and refresh this page. Otherwise, the NEC applies. If your web browser’s integrated pop-up blocker is enabled, it may prevent the some features on this site from functioning normally.

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Within a structure in a raceway that is encased in not less than 2 in. Weatherheads Raceways for overhead service drops In conduit under not less than 18 in.

You must supply the service disconnect with a main bonding jumper [ Permanently mark each service disconnect to identify it as part of the service disconnecting means [ But, feeder conductors covered by Articles and originate on the load side of service equipment.

Support service-entrance cable within 1 ft of service heads and raceway connections, and at intervals not exceeding 30 in.

Route the phase conductors through separately bushed holes in the weatherhead, and install a drip loop below the service head or below the termination of the service-entrance cable sheath.