pdf 502-510-411 I1 500AB 2- or 4-wire set - Connections Popular

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502_510_411_I1_Jan66_500AB_Connections.pdf

502-510-411 I1 500AB 2- or 4-wire set - Connections
Jan 66.  500AB can be used with the 3A speakerphone system in 2-wire service (only).  Later issues were moved to section 529.  See 529-205-100 and 529-205-400.  Scan provided by Dave Gruger.

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