Dead front electrical panel construction

Concept of dead front electrical panel is to ensure the safety of user or operator from accidental touching of bare electrical energized parts. This bare electrically energized parts are as example- the bus bars in panel, connection point of circuit breakers and all applicable connection to various electrical appliances in the panel.

The concept of dead front electrical panel as per electrical standard

NFPA-70(2006) Definition 100:
Dead Front: Without live parts exposed to a person on the operating side of the equipment.

NFPA-70(2006) 110.27 Guarding of Live Parts
—— live parts of electrical equipment operating at 50 volts or more —-

NFPA-70 (2006) 110.27 Guarding of Live Parts A [Notes]
Exception in dead front electrical panel construction:Contact conductors used for traveling cranes are permitted to be bare by 610.13(B) and 610.21(A).

Editors concept-This definition is applicable for the electrical panels and also for any sorts of electrical equipments such as motor, alternator etc. If there is any opening with a risk of electrical energized parts exposure to operator in electrical equipment, panel then it will not be dead front.

  1. So Dead front construction is required for any sorts of electrical equipment as per NFPA-70.
  2. Does Dead front construction is required for only 50 volts or more?
  3. Exception for dead front in case of traveling cranes.

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