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P & I Design Ltd.
Control Panel Specification
P & I REF.
PNL-##A2.SPC
SHT
6
OF
9
5.0
Terminals
5.1
Terminal type is given in the relevant panel specification.
5.2
Terminal segregation shall be maintained to keep categories of cables segregated as stated
earlier.
5.3
All terminal rails shall be clearly marked and individual terminals shall be numbered.
5.4
The terminal mounting rail shall be installed as long as is practical to allow for future
expansion.
5.5
Terminal rails with voltages greater than 24V shall have appropriate shrouding with a label
indicating the voltage.
6.0
Earthing
6.1
All cubicle earth studs shall be bonded to the main earth terminal with flexible earth strip
or cable of minimum size 6mm 2 .
The cubicle shall be constructed to provide an effective earth path for the armouring of
incoming field cables.
6.2
If the cubicle has Intrinsically Safe equipment requiring an I.S. Earth system, this shall be
installed in accordance with BS 5345 Part 4.
The IS earth bar shall be clearly marked INTRINSICALLY SAFE EARTH insulated from
the control panel and shall not be connected to any other earth in the cubicle.