Pennsylvania Code
Title 34 - LABOR AND INDUSTRY
Part I - Department of Labor and Industry
Chapter 39 - SAFETY STANDARDS-GENERAL
Subchapter B - ELECTRIC SAFETY
CONDUCTORS
Section 39.214 - Guarding conductors

(a) Use of enclosing casings. For enclosing insulated conductors, approved permanently grounded metal conduit, waterproof insulating conduit, or grounded metal conduit, waterproof insulating conduit, or grounded metal sheathing shall be used, except that in dry places, ducts, runways, or compartments of suitable fire-resistive material, may be used for conductors, below 750 volts, if containing no exposed combustible material. Reference should also be made to § 39.219 (relating to grounding or isolating service conduits). In damp places conduit shall be made waterproof and provided with suitable means for draining off condensation, unless the conductors contained are lead sheathed cable.

(b) Open conductors below 750 volts. If open insulated conductors between 300 volts to ground and 750 volts, or open bare ungrounded conductors at any voltage below 750 volts (except bare wires used at high temperatures in heating devices, at voltages not exceeding 300 volts to ground) are necessarily brought closer to the floor line than 8 feet, they shall be guarded by permanent screens or enclosures.

(c) Other requirements. If persons at any time remove or pass by screens or other guards for bare conductors while such conductors are alive, such screens or guards shall be of insulating material, and all conducting floors, walls, machine frames and similar surfaces within 8 feet below the conductors or 3 feet horizontally from them, shall be covered with suitable insulating platforms, mats or covers. Reference should also be made to § 39.199(b) (relating to guarding or isolating live parts). Dependence should not be placed on the unprotected insulating covering as a suitable guard or enclosure for such conductors near the floor line, nor in certain other cases. Reference should also be made to § 39.199(a). Other guards should be provided to protect the insulation against mechanical injury and to secure the safety of persons who necessarily come near the conductors.