Ashida ADR233B - Page 6

Doc ID : ADR233B/IM/01
Ref ID : ADR233B/IM/SGI
Rev No. : 05
Page No. : 6 of 479
ADR233B
Removal of the equipment front panel / cover
Removal of the equipment front panel / cover may expose hazardous live parts which must
not be touched until the electrical power is removed.
UL and CSA/CUL Listed or Recognized equipment
To maintain UL and CSA/CUL Listing / Recognized status for North America the equipment
should be installed using UL or CSA Listed or Recognized parts for the following items:
connection cables, protective fuses / fuse holders or circuit breakers, insulation crimp
terminals and replacement internal battery, as specified in the equipment documentation.
For external protective fuses a UL or CSA Listed fuse shall be used. The Listed type shall be
a Class J time delay fuse, with a maximum current rating of 15A and a minimum D.C. rating of
250 Vdc. for example type AJT15.
Where UL or CSA Listing of the equipment is not required, a high rupture capacity
(HRC) fuse type with a maximum current rating of 16 Amps and a minimum D.C. rating of 250
Vdc. may be used, for example Red Spot type NIT or TIA.
Equipment operating conditions
The equipment should be operated within the specified electrical and
environmental limits.
Current transformer circuits
Do not open the secondary circuit of a live CT since the high voltage produced may be lethal
to personnel and could damage insulation.
Generally, for safety, the secondary of the line CT must be shorted before opening any
connections to it.
For most equipment with ring-terminal connections, the threaded terminal block for current
transformer termination has automatic CT shorting on removal of the module. Therefore
external shorting of the CTs may not be required, but it is advisable to use external CT
shorting as general practice.
External resistors, including voltage dependent resistors (VDRs)
Where external resistors, including voltage dependent resistors (VDRs), are fitted to the
equipment, these may present a risk of electric shock or burns, if touched.
Battery replacement
Where internal batteries are fitted they should be replaced with the recommended type and be
installed with the correct polarity to avoid possible damage to the equipment, buildings and
persons.