1.i roto i te ara iahiko rama i roto i te tikanga ki te whakaiti i te utu o te kaupapa, te tikanga whiriwhiri 1P ara iahiko breaker, Me ki te whakarongo ki te kaiwahi iahiko teitei me whai mahi haerenga leakage, me tapahia atu te supply mana teitei;
2. Te tiaki hiko kia kore ai te raina ora me te raina kore e hono ki te aitua (i te wa e hono ana te raina ora me te raina kore ki te 1P ka momotuhia te raina kore me te kore e momotu i te raina ora), ka taea te whakamahi 1P+N taputapu ara iahiko poto, e kiia ana ko te DPN arai iahiko.
3. Mo te whare wehenga ara iahiko he rite te rahi, he rereke te rereketanga i waenga i te 1P me te 1P+N, he kaha ake te pakaru o te waahi o mua atu i tera i raro i te ahua o te aituā poto.Na reira, e taunaki ana kia whakamahia te waahi 2P mo te waahi nui ake me te tiaki i nga wa katoa me te mahi i roto i te kaupapa, engari he nui ake te utu.
I tua atu: 1P, 2P mo te wahanga-kotahi, 3P, 4P mo te wahanga-toru.
Ina he kore tiaki, ko 1P, 3P anake ka taea te whakamahi;Ina he papa whakamarumaru, he pai ake te whakamahi i te 2P, 4P.
1P+N: ka whakauruhia te kaiwawao ki runga i te raina waahanga, ka momotuhia te raina waahanga i te wa ano ka mahia te mahi.