{"schemaVersion":1,"slug":"line-communication-cabinet-power-alarm","name":"Line communication cabinet power alarm","kind":"symbol","abbreviation":"LCCPA","aliases":["Line carrier and protection communication interfaces","switchyards Line carrier and protection communication interfaces","switchyards","Switchyards","Cabinet supply supervision","Communication supply alarm"],"category":"power-distribution","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Reports loss of the monitored control power serving the assigned line communication equipment.","description":["Reports loss of the monitored control power serving the assigned line communication equipment. A protection communication interface carries information between circuit ends or couples a communication signal to a primary line. Its signal path is different from the power-current path even when both use part of the same installation.","In a switchyard line bay, carrier-coupling equipment can connect a protection communication terminal to the transmission conductor. Fiber-based protection uses another physical path but still needs named endpoints and channel supervision. For this reference, the drawing identifies “Cabinet supply supervision” at the input and “Communication supply alarm” at the output. Channel and equipment power faults are different causes.","Show each coupling boundary and the intended information direction. Frequency selection, channel performance, insulation duty and protective coordination require the selected communication and primary equipment design. The functional block is an independent explanation of this named application. Equipment-specific ratings, terminal connections and operating conditions must be established in the project documentation."],"readingNotes":["Start at the named input: Cabinet supply supervision. Identify its source device or document and the state represented on the drawing.","Follow the named output: Communication supply alarm. Cross-reference its destination and separate the command from confirmation that the equipment responded.","Channel and equipment power faults are different causes.","Show each coupling boundary and the intended information direction. Frequency selection, channel performance, insulation duty and protective coordination require the selected communication and primary equipment design."],"drawingChecklist":["Label the source and connection reference for cabinet supply supervision.","Identify the destination and defined state of communication supply alarm.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: Channel and equipment power faults are different causes."],"distinction":"Channel and equipment power faults are different causes. This reference describes the named application; it does not establish a new IEC graphical symbol, an ANSI device-function number or an exact manufacturer connection diagram.","facts":[{"label":"Representation","value":"Functional block"},{"label":"Installation focus","value":"Switchyards"},{"label":"Input / boundary","value":"Cabinet supply supervision"},{"label":"Output / connection","value":"Communication supply alarm"},{"label":"Lookup label","value":"LCCPA is a library lookup label, not a standard device designation."}],"references":[{"sourceId":"pi26-carrier","relevance":"Public technical context for line carrier and protection communication interfaces. Line traps, coupling and power-line carrier communications. The application text and educational graphic are independently authored; the publisher does not certify this representation."}],"related":["capacitor-voltage-transformer","85-pilot-or-carrier-receiver-relay","power-line-carrier-coupling-capacitor-interface"],"artwork":"pi26-line-communication-cabinet-power-alarm","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"switchyards","family":"line-communications","input":"Cabinet supply supervision","output":"Communication supply alarm"},"plainEnglish":{"title":"What this block does","introduction":"Reports loss of the monitored control power serving the assigned line communication equipment.","example":"In a switchyard line bay, carrier-coupling equipment can connect a protection communication terminal to the transmission conductor. Fiber-based protection uses another physical path but still needs named endpoints and channel supervision. For this reference, the drawing identifies “Cabinet supply supervision” at the input and “Communication supply alarm” at the output. Channel and equipment power faults are different causes.","drawings":"Start at the named input: Cabinet supply supervision. Identify its source device or document and the state represented on the drawing. Follow the named output: Communication supply alarm. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Cabinet supply supervision"},{"name":"Output","meaning":"Communication supply alarm"},{"name":"Application reference","meaning":"An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections."}],"diagram":"flow","steps":["Cabinet supply supervision","LCCPA","Communication supply alarm"],"caption":"A reading guide. The entry's original illustration and input/output facts describe this application.","sources":[{"label":"Line traps: power-line carrier communication","url":"https://www.gevernova.com/grid-solutions/sites/default/files/2025-09/Line-Traps-Brochure-EN-N50059-Hybrid-202504-R002.pdf"}],"profileId":"power-installation-line-communications"},"url":"https://eloragrid.ai/symbols/line-communication-cabinet-power-alarm","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/line-communication-cabinet-power-alarm.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pi26-carrier","publisher":"GE Vernova","title":"Line traps: power-line carrier communication","url":"https://www.gevernova.com/grid-solutions/sites/default/files/2025-09/Line-Traps-Brochure-EN-N50059-Hybrid-202504-R002.pdf","scope":"Line traps, coupling and power-line carrier communications.","type":"manufacturer","checkedOn":"2026-11-03","reuse":"link-only","relevance":"Public technical context for line carrier and protection communication interfaces. Line traps, coupling and power-line carrier communications. The application text and educational graphic are independently authored; the publisher does not certify this representation."}]}