On a worked example in the 16th edition design and verification book Pg12.
It describes the installation of 4 showers, the design current is 8000/230 = 35A to get the total assumed current demand is 100% of the first unit + 100% 2nd unit + 25% 3rd unit + 25% 4th unit. why do we only use 25% on the 3rd and 4th units???
2007-02-27 03:12:56 · 5 answers · asked by And P 2 in Home & Garden ➔ Do It Yourself (DIY)
Its not probable that all four showers will be used at once even in a domestic situation, As you may have noticed Hotels don't have individual electric showers
2007-02-27 04:33:54 · answer #1 · answered by want to walk 2 · 0⤊ 0⤋
A domestic circuit can only cope with a current of about 100A.
Each shower is 35A, then 4x35=140A - big no no!
Even so, there are other things in the house drawing current, washing machine, cooker, kettle, tv and the lights so you'll soon over load your domestic supply.
2007-02-27 19:19:35 · answer #2 · answered by Wattsie 3 · 0⤊ 0⤋
Its called diversity factor, normally in adomestic situation it would be very hard for 4xshowers to be working at the same time.IN acommercial situation the incoming supply may have to be uprated to a 3phase supply to cope with demands for showers being operated at the same time,ie guest houses & hotels +flats
2007-02-28 15:08:20 · answer #3 · answered by james h 2 · 0⤊ 0⤋
Its called diversity, and allows limited current loading as a calculated current demand.
The showers are unlikely to be all used at the same time and even then only for a short period.
This is why Diversity is applied to such loadings.
2007-02-28 10:49:56 · answer #4 · answered by robert22061954 3 · 0⤊ 0⤋
The assumption is that they are not all in use simultaneously.
2007-02-27 11:25:09 · answer #5 · answered by Tech Dude 5 · 0⤊ 0⤋