Electrical Engineering - Type B or C MCB for Shower

Author

Type B or C MCB for Shower

shay

2007-04-26, 9:25 am

Dear all,

I have a 10.5kW shower running on 240V.
10mm sq Twin&Earth cable run of 20m running through various materials

Board protected by an RCD.

I want to protect this circuit via an MCB (I have a MEMERA 2000 Board
currenty with HRC Fuses).

Should I use a B or C type MCB for this shower?

Shay

Andrew Gabriel

2007-04-26, 9:25 am

In article <1177583678.721715.312330@n15g2000prd.googlegroups.com>,
shay <shayglenn@gmail.com> writes:
> Dear all,
>
> I have a 10.5kW shower running on 240V.
> 10mm sq Twin&Earth cable run of 20m running through various materials
>
> Board protected by an RCD.
>
> I want to protect this circuit via an MCB (I have a MEMERA 2000 Board
> currenty with HRC Fuses).
>
> Should I use a B or C type MCB for this shower?

A shower has no significant switch-on surge, so you can use a Type B.
Type B is also better in that it will handle circuits with a higher
earth fault loop impedance than a Type C, although this is not
relevant if you have an RCD.

Why do you want to change from an HRC fuse to an MCB? If the fuse is
blowing, then you need to identify what the fault is.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

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