P78 Series Controls for Dual Pressure and Hazardous Location Applications Installation Guide
4
Horizontal Surface: Use four M4 x 6 mm screws provided (Callout 1) and a universal mounting bracket (Callout 3)
which is sold separately when you mount to a flat horizontal surface. See Figure 3.
Wiring
Callout Description
1 Four mounting screws for horizontal surface, M4 x 6 mm (Provided)
2 Four inner mounting M4 holes
3 Universal mounting bracket, Part Number 271-51 (1 pcs., NA only), 271-51L (50 pcs., EU only), Sold
separately
Risk of Explosion or Fire.
Do not disconnect the P78 Pressure Control while its circuit is energized, unless the area is known to be
nonhazardous. Disconnecting the P78 Pressure Control in a hazardous area while its electrical circuit is energized
may result in an explosion or fire, and may cause serious injury or death.
Risque de explosion ou incendie.
Ne pas déconnecter le contrôle de pression P78 lorsque son circuit est sous tension, sauf s'il est avéré que la zone est
non dangereuse. La déconnexion du contrôle de pression P78 dans une zone dangereuse alors que son circuit
électrique est sous tension risque d'entraîner une explosion ou un incendie et de provoquer des blessures graves, voire
mortelles.
IMPORTANT: Use copper conductors only. Make all wiring connections in accordance with local, national, and
regional regulations. Do not exceed the control’s electrical ratings.
IMPORTANT: Use terminal screws furnished in the switch block. Using other terminal screws will void the
warranty and may damage the switch.
IMPORTANT: The P78 control must be wired through a reliable means of limiting the voltage and current,
placed outside the hazardous zone, to ensure insufficient energy supply to cause ignition of the surrounding
atmosphere by an electrical spark or the heating of electrical components.
Figure 3: Mounting the P78 Dual Pressure Control on a horizontal surface
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