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fuse type #102178
05/03/05 03:48 PM
05/03/05 03:48 PM
G
GETELECTRIC  Offline OP
Member
Joined: Oct 2003
Posts: 172
toronto canada
Why would the inspector ask for type hrc fuses for an incoming service on a multiple dwelling unit.

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Re: fuse type #102179
05/04/05 02:47 PM
05/04/05 02:47 PM
T
Tony Moscioni  Offline
Moderator
Joined: May 2001
Posts: 144
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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