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#102178 - 05/03/05 12:48 PM fuse type
GETELECTRIC Offline
Member

Registered: 10/22/03
Posts: 178
Loc: toronto canada
Why would the inspector ask for type hrc fuses for an incoming service on a multiple dwelling unit.

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2014 / 2011 NEC & Related Books and Study Guides
#102179 - 05/04/05 11:47 AM Re: fuse type
Tony Moscioni Offline
Moderator

Registered: 05/15/01
Posts: 144
Loc: CANADA
The excellent current limiting characteristics of fast-acting HRCI-J fuses limits damage to equipment and installations by the thermal and magnetic energy associated with a large short-circuit fault current.

and;

When the short-circuit rating of a panelboard depends upon the use of a specific overcurrent device ahead of the panelboard, the panelboard in addition to the marking required in (b) shall be marked with the following, or equivalent:
WHEN PROTECTED BY _______ A MAXIMUM HRC _______ FUSE OR (MANUFACTURER'S NAME AND TYPE DESIGNATION) CIRCUIT BREAKER RATED NOT MORE THAN _______ A, THIS PANELBOARD IS SUITABLE FOR USE ON A CIRCUIT CAPABLE OF DELIVERING NOT MORE THAN _______ A RMS SYMMETRICAL, ______ V MAXIMUM,

Tony Moscioni
Electrical Inspector
Electrical Safety Authority

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