Edison base fuse holders and Plug CBs

[gfretwell]

A discussion is going on in another BB.

The question is, could you install a new Edison base fuse holder without the S adapter if you said it was always going to have a screw in circuit breaker installed

ref

240.52 Edison-Base Fuseholders.

Fuseholders of the Edison-base type shall be installed only where they are made to accept Type S fuses by the use of adapters.

I say no but there are people with the other opinion.

I think the operative word is "installed". You can put a CB in an existing unprotected Edison fuse holder but if you are installing the fuse holder, it needs an S adapter.

 

[jwelectric]

A discussion is going on in another BB.The question is, could you install a new Edison base fuse holder without the S adapter if you said it was always going to have a screw in circuit breaker installed

ref

240.52 Edison-Base Fuseholders.

Fuseholders of the Edison-base type shall be installed only where they are made to accept Type S fuses by the use of adapters.

I say no but there are people with the other opinion.

I think the operative word is "installed". You can put a CB in an existing unprotected Edison fuse holder but if you are installing the fuse holder, it needs an S adapter.

I agree with the underlined part or be of the S type being installed

 

[iOne]

Old thread. But the International Existing Building Code has something to say on this:

406.1.2​

Plug fuses of the Edison-base type shall be used for replacements only where there is no evidence of over fusing or tampering per applicable requirements of Section 240.51(B) of NFPA 70.

-----------
I'd rather see that require Type-S.