UFC 3 -430-11
14 February 2001
between the panel and the wall behind it when possible. Recommended practices on
control room and panel layout are defined by ISA-RP60.3, Human Engineering for
Control Centers.
4-1.4
Construction. The following applies to both control room and local panels.
4-1.4.1 Electrical Components. Use solid state logic. Do not use relay logic except
where only a few logic steps are involved.
Use items that have a long life and do not have to be frequently replaced. A
typical example is the use of neon bulbs instead of incandescent bulbs for indicator
lights. The neon bulbs have a longer life.
4-1.4.2 Displays. Use displays that are readily visible to the opera tor. This might
entail specifying LED instead of LCD, although LCD consumes less power.
4-1.4.3 Lighting. Provide switched vapor tight lights to illuminate the front of the
panel. Provide additional switched lights to illuminate the inside of the pane l enclosure.
4-1.4.4 Service Outlets. Provide ground fault interrupt (GFI) protected 120 VAC
duplex outlets within each panel enclosure section. Locate outlets not more than 6 feet
apart within each section.
4-1.4.5 Steelwork. Fabricate enclosure pane ls from 3.04 millimeter (11 gauge
(0.1196-inch)) or 3.18 millimeter (1/8 -inch) steel plate. Reinforce the panels as required
for stiffness. Use 1.52 millimeter (16 gauge (0.0598-inch)) minimum steel plate for
doors. Slightly bevel or round all exposed edges. Larger panels are usually fabricated
in 3.05 to 3.66 meter (10 to 12 foot) long sections. Make all joints vertical. Horizontal
panel joints are not acceptable. Use angle iron at each end of a section to make up
vertical butt joints. Preassemble the complete panel in the shop to check for accurate
alignment and surface matching. Panel joints passing through an instrument are not
acceptable.
4-1.4.6 Prefabrication. Specify panels to be complete with all instruments installed,
piped, and wired. The only actions that should be necessary to place the panel in
service are to connect power, instrument signals, and instrument air supply.
4-2
INDIVIDUAL ITEM REQUIREMENTS
4-2.1
microprocessor or computer based), analog, and pneumatic. Use the following
guidelines in selecting the type of controller to be used:
Use the type of controller that is the most economical and reliable.
For plants with many control loops use digital type of controllers.
4-2
Previous Page
