In accordance with the Standard's requirements, these devices are color coded to provide positive voltage and frequency matching and external key ways ensure correct alignment of contact pins. The position of the ground pin relative to the socket's key are designated as a clock hour position.
The ground terminal also has a larger diameter than the contacts, making it impossible to install in a IEC 60309 device with a different voltage rating. The shrouded housing made of high impact nylon material protects the contacts from physical abuse and safeguards against touching live parts when partially engaged. All terminals are clearly marked in both IEC 60309 and North American Standards.
The ABL-17 features include:
