Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Equip only to a Level 3 or lower Thunder-Type monster. It gains 800 ATK, also its effects are negated. Each time it inflicts battle damage to your opponent: Draw 1 card.
--エレキャッシュ
--Wattjustment
local s,id=GetID()
function s.initial_effect(c)
	aux.AddEquipProcedure(c,nil,s.filter)
	--Atk up
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_EQUIP)
	e2:SetCode(EFFECT_UPDATE_ATTACK)
	e2:SetValue(800)
	c:RegisterEffect(e2)
	--Disable
	local e3=Effect.CreateEffect(c)
	e3:SetType(EFFECT_TYPE_EQUIP)
	e3:SetCode(EFFECT_DISABLE)
	c:RegisterEffect(e3)
	--atkup
	local e4=Effect.CreateEffect(c)
	e4:SetDescription(aux.Stringid(id,0))
	e4:SetCategory(CATEGORY_DRAW)
	e4:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_F)
	e4:SetCode(EVENT_DAMAGE)
	e4:SetRange(LOCATION_SZONE)
	e4:SetProperty(EFFECT_FLAG_PLAYER_TARGET)
	e4:SetCondition(s.drcon)
	e4:SetTarget(s.drtg)
	e4:SetOperation(s.drop)
	c:RegisterEffect(e4)
end
function s.filter(c)
	return c:IsLevelBelow(3) and c:IsRace(RACE_THUNDER)
end
function s.drcon(e,tp,eg,ep,ev,re,r,rp,chk)
	return ep~=tp and r==REASON_BATTLE and eg:GetFirst()==e:GetHandler():GetEquipTarget()
end
function s.drtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.SetTargetPlayer(tp)
	Duel.SetTargetParam(1)
	Duel.SetOperationInfo(0,CATEGORY_DRAW,nil,0,tp,1)
end
function s.drop(e,tp,eg,ep,ev,re,r,rp)
	local p,d=Duel.GetChainInfo(0,CHAININFO_TARGET_PLAYER,CHAININFO_TARGET_PARAM)
	Duel.Draw(p,d,REASON_EFFECT)
end