34 Pa. Code § 39.301 - Guarding noncurrent-carrying parts
(a) If telephone or other signal apparatus,
not included under subsection (b) of this section, which is necessarily handled
by persons is permanently connected, except for portable telephones, to
overhead signal circuits exposed by supply lines over 400 volts to ground,
provision shall be made by one of the following methods against shock to
persons handling apparatus:
(1) The use of
suitable protective devices, including fuses and arresters.
(2) The grounding of exposed
noncurrent-carrying metal parts and the suitable guarding of ungrounded
current-carrying parts. Reference should also be made to §
39.302 (relating to guarding
current-carrying parts).
(3) The
arrangement of apparatus in such a way that persons using it will be obliged to
stand on a suitably insulated platform, in a suitably insulated booth or on
other insulating surfaces. This paragraph shall apply where apparatus is
accessible to authorized persons only.
(4) The arrangement of apparatus on signal
circuits exposed to supply lines of more than 750 volts to ground as to have no
exposed current-carrying parts exceeding two square inches in area with which a
person is liable to come in contact and the use of suitable protective devices,
including fuses and arresters or other means.
(b) The signaling devices as fire and police
alarm boxes and telegraph test boxes, if connected to overhead signal circuits
exposed by supply lines over 400 volts to ground, should have the accessible
noncurrent-carrying metal parts permanently grounded whenever the character of
service gives valid objection to the use of arresters or transformers on the
signal circuit. Police alarm boxes if connected to overhead police alarm
circuits should usually be protectd by arresters operating at 400 volts to
ground, placed in the connecting leads outside the box. Fire alarm boxes
connected to overhead circuits, if not protected by arresters, should be
provided with suitable insulating material between the circuit within and the
exposed frame and operating hook, this insulation to be capable of withstanding
the highest voltage of the supply circuits to which the fire-alarm circuit is
exposed up to 7,500 volts.
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